diff --git a/.phpstorm.meta.php b/.phpstorm.meta.php
index 1f2b87fa9..0207165d3 100644
--- a/.phpstorm.meta.php
+++ b/.phpstorm.meta.php
@@ -2,6 +2,7 @@
 
 namespace PHPSTORM_META {
 
+    use Bavix\Wallet\Interfaces\Mathable;
     use Bavix\Wallet\Interfaces\Rateable;
     use Bavix\Wallet\Interfaces\Storable;
     use Bavix\Wallet\Models\Transaction;
@@ -13,7 +14,6 @@
     use Bavix\Wallet\Objects\Operation;
     use Bavix\Wallet\Services\CommonService;
     use Bavix\Wallet\Services\ExchangeService;
-    use Bavix\Wallet\Services\ProxyService;
     use Bavix\Wallet\Services\WalletService;
 
     override(\app(0), map([
@@ -23,11 +23,11 @@
         EmptyLock::class => EmptyLock::class,
         ExchangeService::class => ExchangeService::class,
         CommonService::class => CommonService::class,
-        ProxyService::class => ProxyService::class,
         WalletService::class => WalletService::class,
         Wallet::class => Wallet::class,
         Transfer::class => Transfer::class,
         Transaction::class => Transaction::class,
+        Mathable::class => Mathable::class,
         Rateable::class => Rateable::class,
         Storable::class => Storable::class,
     ]));
diff --git a/README.md b/README.md
index 3fa19c786..6f78f9bb3 100644
--- a/README.md
+++ b/README.md
@@ -29,6 +29,9 @@ laravel-wallet - Easy work with virtual wallet.
 
 ### Upgrade Guide
 
+> Starting with version 5.x, support for Laravel 5 has been discontinued.
+> Update laravel or use version 4.x.
+
 To perform the migration, you will be [helped by the instruction](https://bavix.github.io/laravel-wallet/#/upgrade-guide).
 
 ### Extensions
@@ -98,7 +101,7 @@ class Item extends Model implements Product
         return true; 
     }
     
-    public function getAmountProduct(Customer $customer): int
+    public function getAmountProduct(Customer $customer)
     {
         return 100;
     }
diff --git a/changelog.md b/changelog.md
index 9ee2820b9..bebce8e08 100644
--- a/changelog.md
+++ b/changelog.md
@@ -6,6 +6,20 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Added
+- add support "Arbitrary Precision Mathematics" (`ext-bcmath`) #139 #146
+- add `Mathable` service (helps switch quickly from bcmath to php computing)
+
+### Changed
+- add unit cases
+- upgrade composer packages
+- Now all casts are in the config, not in the model. If you use bcmath, then all values are reduced to a string.
+
+### Removed
+- Strong typing (models, interfaces, etc.)
+- all deprecated methods are removed
+- `nesbot/carbon` is no longer needed for the library to work
+
 ## [4.2.0] - 2020-03-08
 
 ### Added
@@ -142,7 +156,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Deprecated
 - class `Taxing`.
 
-### Remove
+### Removed
 - The ability to change the ratio  `coefficient`.
 - Removed private and protected methods, the traits turned out to be more clean.
 
@@ -453,7 +467,7 @@ The operation is now executed in the transaction and updates the new `refund` fi
 - Exceptions: AmountInvalid, BalanceIsEmpty.
 - Models: Transfer, Transaction.
 
-[Unreleased]: https://github.com/bavix/laravel-wallet/compare/4.2.0...HEAD
+[Unreleased]: https://github.com/bavix/laravel-wallet/compare/4.2.0...develop
 [4.2.0]: https://github.com/bavix/laravel-wallet/compare/4.1.2...4.2.0
 [4.1.2]: https://github.com/bavix/laravel-wallet/compare/4.1.1...4.1.2
 [4.1.1]: https://github.com/bavix/laravel-wallet/compare/4.1.0...4.1.1
diff --git a/composer.json b/composer.json
index 8b9dcab66..2810e0e1d 100644
--- a/composer.json
+++ b/composer.json
@@ -28,7 +28,6 @@
     "php": "^7.2|^8.0",
     "ext-pdo": "*",
     "illuminate/database": "^6.0|^7.0",
-    "nesbot/carbon": "^2.0",
     "doctrine/dbal": "^2.8",
     "ramsey/uuid": "^3.0"
   },
@@ -40,6 +39,7 @@
     "laravel/cashier": "^10.0"
   },
   "suggest": {
+    "ext-bcmath": "Used for accurate calculations of large numbers",
     "bavix/laravel-wallet-swap": "Addition to the laravel-wallet library for quick setting of exchange rates",
     "bavix/laravel-wallet-vacuum": "Addition to the laravel-wallet library for quick fix race condition"
   },
@@ -54,6 +54,9 @@
     }
   },
   "extra": {
+    "branch-alias": {
+      "dev-develop": "5.0.x-dev"
+    },
     "laravel": {
       "providers": [
         "Bavix\\Wallet\\WalletServiceProvider"
diff --git a/config/config.php b/config/config.php
index 2554bd437..6800b02e4 100644
--- a/config/config.php
+++ b/config/config.php
@@ -6,7 +6,6 @@
 use Bavix\Wallet\Objects\Operation;
 use Bavix\Wallet\Services\ExchangeService;
 use Bavix\Wallet\Services\CommonService;
-use Bavix\Wallet\Services\ProxyService;
 use Bavix\Wallet\Services\WalletService;
 use Bavix\Wallet\Services\LockService;
 use Bavix\Wallet\Models\Transaction;
@@ -14,8 +13,20 @@
 use Bavix\Wallet\Models\Wallet;
 use Bavix\Wallet\Simple\Rate;
 use Bavix\Wallet\Simple\Store;
+use Bavix\Wallet\Simple\BCMath;
+use Bavix\Wallet\Simple\Math;
+
+$bcLoaded = extension_loaded('bcmath');
 
 return [
+    /**
+     * This parameter is necessary for more accurate calculations.
+     * PS, Arbitrary Precision Calculations
+     */
+    'math' => [
+        'scale' => 64,
+    ],
+
     /**
      * The parameter is used for fast packet overload.
      * You do not need to search for the desired class by code, the library will do it itself.
@@ -23,6 +34,9 @@
     'package' => [
         'rateable' => Rate::class,
         'storable' => Store::class,
+        'mathable' => $bcLoaded ?
+            BCMath::class :
+            Math::class,
     ],
 
     /**
@@ -60,7 +74,6 @@
     'services' => [
         'exchange' => ExchangeService::class,
         'common' => CommonService::class,
-        'proxy' => ProxyService::class,
         'wallet' => WalletService::class,
         'lock' => LockService::class,
     ],
@@ -78,7 +91,9 @@
     'transaction' => [
         'table' => 'transactions',
         'model' => Transaction::class,
-        'casts' => [],
+        'casts' => [
+            'amount' => $bcLoaded ? 'string' : 'int',
+        ],
     ],
 
     /**
@@ -87,7 +102,9 @@
     'transfer' => [
         'table' => 'transfers',
         'model' => Transfer::class,
-        'casts' => [],
+        'casts' => [
+            'fee' => $bcLoaded ? 'string' : 'int',
+        ],
     ],
 
     /**
@@ -96,7 +113,9 @@
     'wallet' => [
         'table' => 'wallets',
         'model' => Wallet::class,
-        'casts' => [],
+        'casts' => [
+            'balance' => $bcLoaded ? 'string' : 'int',
+        ],
         'default' => [
             'name' => 'Default Wallet',
             'slug' => 'default',
diff --git a/database/migrations_v1/2018_11_06_222923_create_transactions_table.php b/database/migrations_v1/2018_11_06_222923_create_transactions_table.php
index 215753958..a047867e6 100644
--- a/database/migrations_v1/2018_11_06_222923_create_transactions_table.php
+++ b/database/migrations_v1/2018_11_06_222923_create_transactions_table.php
@@ -18,7 +18,7 @@ class CreateTransactionsTable extends Migration
     public function up(): void
     {
         Schema::create($this->table(), function (Blueprint $table) {
-            $table->increments('id');
+            $table->bigIncrements('id');
             $table->morphs('payable');
             $table->enum('type', ['deposit', 'withdraw'])->index();
             $table->bigInteger('amount');
diff --git a/database/migrations_v1/2018_11_07_192923_create_transfers_table.php b/database/migrations_v1/2018_11_07_192923_create_transfers_table.php
index b88256f18..29a89fa94 100644
--- a/database/migrations_v1/2018_11_07_192923_create_transfers_table.php
+++ b/database/migrations_v1/2018_11_07_192923_create_transfers_table.php
@@ -15,11 +15,11 @@ class CreateTransfersTable extends Migration
     public function up(): void
     {
         Schema::create($this->table(), function (Blueprint $table) {
-            $table->increments('id');
+            $table->bigIncrements('id');
             $table->morphs('from');
             $table->morphs('to');
-            $table->unsignedInteger('deposit_id');
-            $table->unsignedInteger('withdraw_id');
+            $table->unsignedBigInteger('deposit_id');
+            $table->unsignedBigInteger('withdraw_id');
             $table->uuid('uuid')->unique();
             $table->timestamps();
 
diff --git a/database/migrations_v2/2018_11_15_124230_create_wallets_table.php b/database/migrations_v2/2018_11_15_124230_create_wallets_table.php
index c406732c4..5eb658bdc 100644
--- a/database/migrations_v2/2018_11_15_124230_create_wallets_table.php
+++ b/database/migrations_v2/2018_11_15_124230_create_wallets_table.php
@@ -2,7 +2,6 @@
 
 use Bavix\Wallet\Models\Transaction;
 use Bavix\Wallet\Models\Wallet;
-use Carbon\Carbon;
 use Illuminate\Database\Eloquent\Collection;
 use Illuminate\Database\Migrations\Migration;
 use Illuminate\Database\Schema\Blueprint;
@@ -26,7 +25,7 @@ protected function table(): string
     public function up(): void
     {
         Schema::create($this->table(), function (Blueprint $table) {
-            $table->increments('id');
+            $table->bigIncrements('id');
             $table->morphs('holder');
             $table->string('name');
             $table->string('slug')->index();
@@ -48,8 +47,8 @@ public function up(): void
             ->selectRaw('? as name', [$default])
             ->selectRaw('? as slug', [$slug])
             ->selectRaw('sum(amount) as balance')
-            ->selectRaw('? as created_at', [Carbon::now()])
-            ->selectRaw('? as updated_at', [Carbon::now()])
+            ->selectRaw('? as created_at', [DB::raw('now()')])
+            ->selectRaw('? as updated_at', [DB::raw('now()')])
             ->groupBy('holder_type', 'holder_id')
             ->orderBy('holder_type');
 
diff --git a/database/migrations_v2/2018_11_19_164609_update_transactions_table.php b/database/migrations_v2/2018_11_19_164609_update_transactions_table.php
index e56f2ed5a..ef55337a8 100644
--- a/database/migrations_v2/2018_11_19_164609_update_transactions_table.php
+++ b/database/migrations_v2/2018_11_19_164609_update_transactions_table.php
@@ -33,7 +33,7 @@ protected function walletTable(): string
     public function up(): void
     {
         Schema::table($this->table(), function (Blueprint $table) {
-            $table->unsignedInteger('wallet_id')
+            $table->unsignedBigInteger('wallet_id')
                 ->nullable()
                 ->after('payable_id');
 
diff --git a/docs/basic-usage.md b/docs/basic-usage.md
index 70a39acab..0902a92e2 100644
--- a/docs/basic-usage.md
+++ b/docs/basic-usage.md
@@ -62,7 +62,7 @@ class Item extends Model implements Product
         return true; 
     }
     
-    public function getAmountProduct(Customer $customer): int
+    public function getAmountProduct(Customer $customer)
     {
         return 100;
     }
diff --git a/docs/cart.md b/docs/cart.md
index 4367dcb0f..fca79cfbb 100644
--- a/docs/cart.md
+++ b/docs/cart.md
@@ -36,7 +36,7 @@ class Item extends Model implements Product
         return true; 
     }
 
-    public function getAmountProduct(Customer $customer): int
+    public function getAmountProduct(Customer $customer)
     {
         return round($this->price * 100);
     }
diff --git a/docs/exchange.md b/docs/exchange.md
index 9acaae7d0..15de3fbfe 100644
--- a/docs/exchange.md
+++ b/docs/exchange.md
@@ -42,7 +42,7 @@ class MyRateService extends \Bavix\Wallet\Simple\Rate
         ],
     ];
 
-    protected function rate(Wallet $wallet): float
+    protected function rate(Wallet $wallet)
     {
         $from = app(WalletService::class)->getWallet($this->withCurrency);
         $to = app(WalletService::class)->getWallet($wallet);
@@ -54,7 +54,7 @@ class MyRateService extends \Bavix\Wallet\Simple\Rate
         );
     }
 
-    public function convertTo(Wallet $wallet): float
+    public function convertTo(Wallet $wallet)
     {
         return parent::convertTo($wallet) * $this->rate($wallet);
     }
diff --git a/docs/gift.md b/docs/gift.md
index ebeadbf2e..7fd1a561d 100644
--- a/docs/gift.md
+++ b/docs/gift.md
@@ -36,7 +36,7 @@ class Item extends Model implements Product
         return true; 
     }
 
-    public function getAmountProduct(Customer $customer): int
+    public function getAmountProduct(Customer $customer)
     {
         return 100;
     }
diff --git a/docs/pay-free.md b/docs/pay-free.md
index 278db4460..3e41480ab 100644
--- a/docs/pay-free.md
+++ b/docs/pay-free.md
@@ -36,7 +36,7 @@ class Item extends Model implements Product
         return true; 
     }
 
-    public function getAmountProduct(Customer $customer): int
+    public function getAmountProduct(Customer $customer)
     {
         return 100;
     }
diff --git a/docs/payment.md b/docs/payment.md
index c9b042dff..0bef9a8d9 100644
--- a/docs/payment.md
+++ b/docs/payment.md
@@ -36,7 +36,7 @@ class Item extends Model implements Product
         return true; 
     }
 
-    public function getAmountProduct(Customer $customer): int
+    public function getAmountProduct(Customer $customer)
     {
         return 100;
     }
diff --git a/docs/refund.md b/docs/refund.md
index 8e809a1af..af709a744 100644
--- a/docs/refund.md
+++ b/docs/refund.md
@@ -36,7 +36,7 @@ class Item extends Model implements Product
         return true; 
     }
 
-    public function getAmountProduct(Customer $customer): int
+    public function getAmountProduct(Customer $customer)
     {
         return 100;
     }
diff --git a/docs/ru/basic-usage.md b/docs/ru/basic-usage.md
index e59e8aefa..2d99f6fd6 100644
--- a/docs/ru/basic-usage.md
+++ b/docs/ru/basic-usage.md
@@ -65,7 +65,7 @@ class Item extends Model implements Product
         return true; 
     }
     
-    public function getAmountProduct(Customer $customer): int
+    public function getAmountProduct(Customer $customer)
     {
         return 100;
     }
diff --git a/docs/ru/cart.md b/docs/ru/cart.md
index 2b8345561..4c2867d1a 100644
--- a/docs/ru/cart.md
+++ b/docs/ru/cart.md
@@ -36,7 +36,7 @@ class Item extends Model implements Product
         return true; 
     }
 
-    public function getAmountProduct(Customer $customer): int
+    public function getAmountProduct(Customer $customer)
     {
         return round($this->price * 100);
     }
diff --git a/docs/ru/exchange.md b/docs/ru/exchange.md
index cd2ae9efb..3c4e2e98c 100644
--- a/docs/ru/exchange.md
+++ b/docs/ru/exchange.md
@@ -41,7 +41,7 @@ class MyRateService extends \Bavix\Wallet\Simple\Rate
         ],
     ];
 
-    protected function rate(Wallet $wallet): float
+    protected function rate(Wallet $wallet)
     {
         $from = app(WalletService::class)->getWallet($this->withCurrency);
         $to = app(WalletService::class)->getWallet($wallet);
@@ -53,7 +53,7 @@ class MyRateService extends \Bavix\Wallet\Simple\Rate
         );
     }
 
-    public function convertTo(Wallet $wallet): float
+    public function convertTo(Wallet $wallet)
     {
         return parent::convertTo($wallet) * $this->rate($wallet);
     }
diff --git a/docs/ru/gift.md b/docs/ru/gift.md
index e65e82c22..13466149f 100644
--- a/docs/ru/gift.md
+++ b/docs/ru/gift.md
@@ -36,7 +36,7 @@ class Item extends Model implements Product
         return true; 
     }
 
-    public function getAmountProduct(Customer $customer): int
+    public function getAmountProduct(Customer $customer)
     {
         return 100;
     }
diff --git a/docs/ru/pay-free.md b/docs/ru/pay-free.md
index 6c621090a..c419e6f46 100644
--- a/docs/ru/pay-free.md
+++ b/docs/ru/pay-free.md
@@ -43,7 +43,7 @@ class Item extends Model implements Product
         return true; 
     }
 
-    public function getAmountProduct(Customer $customer): int
+    public function getAmountProduct(Customer $customer)
     {
         return 100;
     }
diff --git a/docs/ru/payment.md b/docs/ru/payment.md
index 3d2635b15..e364d99f5 100644
--- a/docs/ru/payment.md
+++ b/docs/ru/payment.md
@@ -36,7 +36,7 @@ class Item extends Model implements Product
         return true; 
     }
 
-    public function getAmountProduct(Customer $customer): int
+    public function getAmountProduct(Customer $customer)
     {
         return 100;
     }
diff --git a/docs/ru/refund.md b/docs/ru/refund.md
index d1e01e5ea..a37f6c8ab 100644
--- a/docs/ru/refund.md
+++ b/docs/ru/refund.md
@@ -36,7 +36,7 @@ class Item extends Model implements Product
         return true; 
     }
 
-    public function getAmountProduct(Customer $customer): int
+    public function getAmountProduct(Customer $customer)
     {
         return 100;
     }
diff --git a/docs/ru/taxing.md b/docs/ru/taxing.md
index 930f0f25e..1f1c2c9c5 100644
--- a/docs/ru/taxing.md
+++ b/docs/ru/taxing.md
@@ -37,7 +37,7 @@ class Item extends Model implements Product, Taxable
         return true; 
     }
 
-    public function getAmountProduct(Customer $customer): int
+    public function getAmountProduct(Customer $customer)
     {
         return 100;
     }
@@ -55,7 +55,7 @@ class Item extends Model implements Product, Taxable
         return (string)$this->getKey();
     }
     
-    public function getFeePercent() : float
+    public function getFeePercent()
     {
         return 0.03; // 3%    
     }
@@ -109,7 +109,7 @@ class Item extends Model implements Product, MinimalTaxable
         return true; 
     }
 
-    public function getAmountProduct(Customer $customer): int
+    public function getAmountProduct(Customer $customer)
     {
         return 100;
     }
@@ -127,12 +127,12 @@ class Item extends Model implements Product, MinimalTaxable
         return (string)$this->getKey();
     }
     
-    public function getFeePercent() : float
+    public function getFeePercent()
     {
         return 0.03; // 3%    
     }
     
-    public function getMinimalFee() : int
+    public function getMinimalFee()
     {
         return 5; // 3%, minimum int(5)    
     }
diff --git a/docs/ru/upgrade-guide.md b/docs/ru/upgrade-guide.md
index a2c50731e..478133377 100644
--- a/docs/ru/upgrade-guide.md
+++ b/docs/ru/upgrade-guide.md
@@ -91,3 +91,44 @@ class Item extends Model implements Product
         return $this->price;
     }
 ```
+
+## 4.0.x → 5.0.x
+
+> Обновляясь с версии 4.x до 5.x Вы теряете строгую типизацию. 
+> Данная крайность необходима для вычислений с произвольной точностью.
+
+В товарах:
+
+Ваш код в версии 4.x:
+```php
+    public function getAmountProduct(Customer $customer): int  { ... }
+
+    public function getFeePercent(): float  { ... }
+
+    public function getMinimalFee(): int { ... }
+```
+
+Ваш код в версии 5.x:
+```php
+    public function getAmountProduct(Customer $customer) { ... }
+
+    public function getFeePercent() { ... }
+
+    public function getMinimalFee() { ... }
+```
+
+В сервисе обработки курса валют:
+
+Ваш код в версии 4.x:
+```php
+    protected function rate(Wallet $wallet): float { ... }
+
+    public function convertTo(Wallet $wallet): float { ... }
+```
+
+Ваш код в версии 5.x:
+```php
+    protected function rate(Wallet $wallet) { ... }
+
+    public function convertTo(Wallet $wallet) { ... }
+```
diff --git a/docs/taxing.md b/docs/taxing.md
index 79cccd15c..f47b1d353 100644
--- a/docs/taxing.md
+++ b/docs/taxing.md
@@ -37,7 +37,7 @@ class Item extends Model implements Product, Taxable
         return true; 
     }
 
-    public function getAmountProduct(Customer $customer): int
+    public function getAmountProduct(Customer $customer)
     {
         return 100;
     }
@@ -55,7 +55,7 @@ class Item extends Model implements Product, Taxable
         return (string)$this->getKey();
     }
     
-    public function getFeePercent() : float
+    public function getFeePercent()
     {
         return 0.03; // 3%    
     }
@@ -108,7 +108,7 @@ class Item extends Model implements Product, MinimalTaxable
         return true; 
     }
 
-    public function getAmountProduct(Customer $customer): int
+    public function getAmountProduct(Customer $customer)
     {
         return 100;
     }
@@ -126,12 +126,12 @@ class Item extends Model implements Product, MinimalTaxable
         return (string)$this->getKey();
     }
     
-    public function getFeePercent() : float
+    public function getFeePercent()
     {
         return 0.03; // 3%    
     }
     
-    public function getMinimalFee() : int
+    public function getMinimalFee()
     {
         return 5; // 3%, minimum int(5)    
     }
diff --git a/docs/upgrade-guide.md b/docs/upgrade-guide.md
index d0ebea962..60bd53255 100644
--- a/docs/upgrade-guide.md
+++ b/docs/upgrade-guide.md
@@ -91,3 +91,44 @@ Your code on 4.x:
         return $this->price;
     }
 ```
+
+## 4.0.x → 5.0.x
+
+> By updating the library from 4.x to 5.x you lose strong typing. 
+> This solution was necessary to support APM (Arbitrary Precision Mathematics).
+
+In your goods:
+
+Your code on 4.x:
+```php
+    public function getAmountProduct(Customer $customer): int  { ... }
+
+    public function getFeePercent(): float  { ... }
+
+    public function getMinimalFee(): int { ... }
+```
+
+Your code on 5.x:
+```php
+    public function getAmountProduct(Customer $customer) { ... }
+
+    public function getFeePercent() { ... }
+
+    public function getMinimalFee() { ... }
+```
+
+In the exchange rate processing service:
+
+Your code on 4.x:
+```php
+    protected function rate(Wallet $wallet): float { ... }
+
+    public function convertTo(Wallet $wallet): float { ... }
+```
+
+Your code on 5.x:
+```php
+    protected function rate(Wallet $wallet) { ... }
+
+    public function convertTo(Wallet $wallet) { ... }
+```
diff --git a/src/Commands/RefreshBalance.php b/src/Commands/RefreshBalance.php
index 90e2e0840..f1ec0440a 100644
--- a/src/Commands/RefreshBalance.php
+++ b/src/Commands/RefreshBalance.php
@@ -4,7 +4,6 @@
 
 use Bavix\Wallet\Models\Wallet;
 use Bavix\Wallet\Services\DbService;
-use Bavix\Wallet\Services\ProxyService;
 use Illuminate\Console\Command;
 use Illuminate\Database\Query\JoinClause;
 use Illuminate\Database\SQLiteConnection;
@@ -34,10 +33,10 @@ class RefreshBalance extends Command
 
     /**
      * @return void
+     * @throws
      */
     public function handle(): void
     {
-        app(ProxyService::class)->fresh();
         app(DbService::class)->transaction(function () {
             $wallet = config('wallet.wallet.table', 'wallets');
             app(DbService::class)
diff --git a/src/Interfaces/Discount.php b/src/Interfaces/Discount.php
index b7ad22a30..33a88b96a 100644
--- a/src/Interfaces/Discount.php
+++ b/src/Interfaces/Discount.php
@@ -6,7 +6,7 @@ interface Discount extends Product
 {
     /**
      * @param Customer $customer
-     * @return int
+     * @return int|float
      */
-    public function getPersonalDiscount(Customer $customer): int;
+    public function getPersonalDiscount(Customer $customer);
 }
diff --git a/src/Interfaces/Exchangeable.php b/src/Interfaces/Exchangeable.php
index 9f3c1c85b..45f03b4dd 100644
--- a/src/Interfaces/Exchangeable.php
+++ b/src/Interfaces/Exchangeable.php
@@ -12,7 +12,7 @@ interface Exchangeable
      * @param array|null $meta
      * @return Transfer
      */
-    public function exchange(Wallet $to, int $amount, ?array $meta = null): Transfer;
+    public function exchange(Wallet $to, $amount, ?array $meta = null): Transfer;
 
     /**
      * @param Wallet $to
@@ -20,7 +20,7 @@ public function exchange(Wallet $to, int $amount, ?array $meta = null): Transfer
      * @param array|null $meta
      * @return Transfer|null
      */
-    public function safeExchange(Wallet $to, int $amount, ?array $meta = null): ?Transfer;
+    public function safeExchange(Wallet $to, $amount, ?array $meta = null): ?Transfer;
 
     /**
      * @param Wallet $to
@@ -28,5 +28,5 @@ public function safeExchange(Wallet $to, int $amount, ?array $meta = null): ?Tra
      * @param array|null $meta
      * @return Transfer
      */
-    public function forceExchange(Wallet $to, int $amount, ?array $meta = null): Transfer;
+    public function forceExchange(Wallet $to, $amount, ?array $meta = null): Transfer;
 }
diff --git a/src/Interfaces/Mathable.php b/src/Interfaces/Mathable.php
new file mode 100644
index 000000000..dd0745973
--- /dev/null
+++ b/src/Interfaces/Mathable.php
@@ -0,0 +1,78 @@
+<?php
+
+namespace Bavix\Wallet\Interfaces;
+
+interface Mathable
+{
+    /**
+     * @param int|float|string $first
+     * @param int|float|string $second
+     * @param int|null $scale
+     * @return string
+     */
+    public function add($first, $second, ?int $scale = null): string;
+
+    /**
+     * @param int|float|string $first
+     * @param int|float|string $second
+     * @param int|null $scale
+     * @return string
+     */
+    public function sub($first, $second, ?int $scale = null): string;
+
+    /**
+     * @param int|float|string $first
+     * @param int|float|string $second
+     * @param int|null $scale
+     * @return string
+     */
+    public function div($first, $second, ?int $scale = null): string;
+
+    /**
+     * @param int|float|string $first
+     * @param int|float|string $second
+     * @param int|null $scale
+     * @return string
+     */
+    public function mul($first, $second, ?int $scale = null): string;
+
+    /**
+     * @param int|float|string $first
+     * @param int|string $second
+     * @param int|null $scale
+     * @return string
+     */
+    public function pow($first, $second, ?int $scale = null): string;
+
+    /**
+     * @param int|float|string $number
+     * @param int $precision
+     * @return string
+     */
+    public function round($number, int $precision = 0): string;
+
+    /**
+     * @param int|float|string $number
+     * @return string
+     */
+    public function floor($number): string;
+
+    /**
+     * @param int|float|string $number
+     * @return string
+     */
+    public function ceil($number): string;
+
+    /**
+     * @param int|float|string $number
+     * @return string
+     */
+    public function abs($number): string;
+
+    /**
+     * @param int|float|string $first
+     * @param int|float|string $second
+     * @return int
+     */
+    public function compare($first, $second): int;
+}
diff --git a/src/Interfaces/MinimalTaxable.php b/src/Interfaces/MinimalTaxable.php
index 0a5d7ea01..4976f5a17 100644
--- a/src/Interfaces/MinimalTaxable.php
+++ b/src/Interfaces/MinimalTaxable.php
@@ -5,7 +5,7 @@
 interface MinimalTaxable extends Taxable
 {
     /**
-     * @return int
+     * @return int|float
      */
-    public function getMinimalFee(): int;
+    public function getMinimalFee();
 }
diff --git a/src/Interfaces/Product.php b/src/Interfaces/Product.php
index 1eb42033e..cc110dfda 100644
--- a/src/Interfaces/Product.php
+++ b/src/Interfaces/Product.php
@@ -16,9 +16,9 @@ public function canBuy(Customer $customer, int $quantity = 1, bool $force = null
 
     /**
      * @param Customer $customer
-     * @return int
+     * @return float|int
      */
-    public function getAmountProduct(Customer $customer): int;
+    public function getAmountProduct(Customer $customer);
 
     /**
      * @return array
diff --git a/src/Interfaces/Rateable.php b/src/Interfaces/Rateable.php
index c45ec5c9e..8f42bf318 100644
--- a/src/Interfaces/Rateable.php
+++ b/src/Interfaces/Rateable.php
@@ -9,7 +9,7 @@ interface Rateable
      * @param int $amount
      * @return Rateable
      */
-    public function withAmount(int $amount): self;
+    public function withAmount($amount): self;
 
     /**
      * @param Wallet $wallet
@@ -19,8 +19,8 @@ public function withCurrency(Wallet $wallet): self;
 
     /**
      * @param Wallet $wallet
-     * @return float
+     * @return int|float
      */
-    public function convertTo(Wallet $wallet): float;
+    public function convertTo(Wallet $wallet);
 
 }
diff --git a/src/Interfaces/Storable.php b/src/Interfaces/Storable.php
index fd9371f5d..5c41224ee 100644
--- a/src/Interfaces/Storable.php
+++ b/src/Interfaces/Storable.php
@@ -6,21 +6,21 @@ interface Storable
 {
     /**
      * @param Wallet $object
-     * @return int
+     * @return int|float
      */
-    public function getBalance($object): int;
+    public function getBalance($object);
 
     /**
      * @param Wallet $object
      * @param int $amount
-     * @return int
+     * @return int|float
      */
-    public function incBalance($object, int $amount): int;
+    public function incBalance($object, $amount);
 
     /**
      * @param Wallet $object
      * @param int $amount
      * @return bool
      */
-    public function setBalance($object, int $amount): bool;
+    public function setBalance($object, $amount): bool;
 }
diff --git a/src/Interfaces/Taxable.php b/src/Interfaces/Taxable.php
index df61a7ccf..100a4fe68 100644
--- a/src/Interfaces/Taxable.php
+++ b/src/Interfaces/Taxable.php
@@ -13,7 +13,7 @@ interface Taxable
      * Minimum 0; Maximum 100
      * Example: return 7.5; // 7.5%
      *
-     * @return float
+     * @return int|float
      */
-    public function getFeePercent(): float;
+    public function getFeePercent();
 }
diff --git a/src/Interfaces/Wallet.php b/src/Interfaces/Wallet.php
index 6d9f71937..215e67b29 100644
--- a/src/Interfaces/Wallet.php
+++ b/src/Interfaces/Wallet.php
@@ -14,7 +14,7 @@ interface Wallet
      * @param bool $confirmed
      * @return Transaction
      */
-    public function deposit(int $amount, ?array $meta = null, bool $confirmed = true): Transaction;
+    public function deposit($amount, ?array $meta = null, bool $confirmed = true): Transaction;
 
     /**
      * @param int $amount
@@ -22,7 +22,7 @@ public function deposit(int $amount, ?array $meta = null, bool $confirmed = true
      * @param bool $confirmed
      * @return Transaction
      */
-    public function withdraw(int $amount, ?array $meta = null, bool $confirmed = true): Transaction;
+    public function withdraw($amount, ?array $meta = null, bool $confirmed = true): Transaction;
 
     /**
      * @param int $amount
@@ -30,46 +30,43 @@ public function withdraw(int $amount, ?array $meta = null, bool $confirmed = tru
      * @param bool $confirmed
      * @return Transaction
      */
-    public function forceWithdraw(int $amount, ?array $meta = null, bool $confirmed = true): Transaction;
+    public function forceWithdraw($amount, ?array $meta = null, bool $confirmed = true): Transaction;
 
     /**
      * @param self $wallet
      * @param int $amount
      * @param array|null $meta
-     * @param string $status
      * @return Transfer
      */
-    public function transfer(self $wallet, int $amount, ?array $meta = null): Transfer;
+    public function transfer(self $wallet, $amount, ?array $meta = null): Transfer;
 
     /**
      * @param self $wallet
      * @param int $amount
      * @param array|null $meta
-     * @param string $status
      * @return null|Transfer
      */
-    public function safeTransfer(self $wallet, int $amount, ?array $meta = null): ?Transfer;
+    public function safeTransfer(self $wallet, $amount, ?array $meta = null): ?Transfer;
 
     /**
      * @param Wallet $wallet
      * @param int $amount
      * @param array|null $meta
-     * @param string $status
      * @return Transfer
      */
-    public function forceTransfer(Wallet $wallet, int $amount, ?array $meta = null): Transfer;
+    public function forceTransfer(Wallet $wallet, $amount, ?array $meta = null): Transfer;
 
     /**
      * @param int $amount
      * @param bool $allowZero
      * @return bool
      */
-    public function canWithdraw(int $amount, bool $allowZero = null): bool;
+    public function canWithdraw($amount, bool $allowZero = null): bool;
 
     /**
-     * @return int
+     * @return int|float
      */
-    public function getBalanceAttribute(): int;
+    public function getBalanceAttribute();
 
     /**
      * @return MorphMany
diff --git a/src/Interfaces/WalletFloat.php b/src/Interfaces/WalletFloat.php
index 635c48712..f216f93a2 100644
--- a/src/Interfaces/WalletFloat.php
+++ b/src/Interfaces/WalletFloat.php
@@ -13,7 +13,7 @@ interface WalletFloat
      * @param bool $confirmed
      * @return Transaction
      */
-    public function depositFloat(float $amount, ?array $meta = null, bool $confirmed = true): Transaction;
+    public function depositFloat($amount, ?array $meta = null, bool $confirmed = true): Transaction;
 
     /**
      * @param float $amount
@@ -21,7 +21,7 @@ public function depositFloat(float $amount, ?array $meta = null, bool $confirmed
      * @param bool $confirmed
      * @return Transaction
      */
-    public function withdrawFloat(float $amount, ?array $meta = null, bool $confirmed = true): Transaction;
+    public function withdrawFloat($amount, ?array $meta = null, bool $confirmed = true): Transaction;
 
     /**
      * @param float $amount
@@ -29,43 +29,40 @@ public function withdrawFloat(float $amount, ?array $meta = null, bool $confirme
      * @param bool $confirmed
      * @return Transaction
      */
-    public function forceWithdrawFloat(float $amount, ?array $meta = null, bool $confirmed = true): Transaction;
+    public function forceWithdrawFloat($amount, ?array $meta = null, bool $confirmed = true): Transaction;
 
     /**
      * @param Wallet $wallet
      * @param float $amount
      * @param array|null $meta
-     * @param string $status
      * @return Transfer
      */
-    public function transferFloat(Wallet $wallet, float $amount, ?array $meta = null): Transfer;
+    public function transferFloat(Wallet $wallet, $amount, ?array $meta = null): Transfer;
 
     /**
      * @param Wallet $wallet
      * @param float $amount
      * @param array|null $meta
-     * @param string $status
      * @return null|Transfer
      */
-    public function safeTransferFloat(Wallet $wallet, float $amount, ?array $meta = null): ?Transfer;
+    public function safeTransferFloat(Wallet $wallet, $amount, ?array $meta = null): ?Transfer;
 
     /**
      * @param Wallet $wallet
      * @param float $amount
      * @param array|null $meta
-     * @param string $status
      * @return Transfer
      */
-    public function forceTransferFloat(Wallet $wallet, float $amount, ?array $meta = null): Transfer;
+    public function forceTransferFloat(Wallet $wallet, $amount, ?array $meta = null): Transfer;
 
     /**
      * @param float $amount
      * @return bool
      */
-    public function canWithdrawFloat(float $amount): bool;
+    public function canWithdrawFloat($amount): bool;
 
     /**
-     * @return float
+     * @return int|float
      */
-    public function getBalanceFloatAttribute(): float;
+    public function getBalanceFloatAttribute();
 }
diff --git a/src/Models/Transaction.php b/src/Models/Transaction.php
index baf628baa..0945756e5 100644
--- a/src/Models/Transaction.php
+++ b/src/Models/Transaction.php
@@ -2,6 +2,7 @@
 
 namespace Bavix\Wallet\Models;
 
+use Bavix\Wallet\Interfaces\Mathable;
 use Bavix\Wallet\Interfaces\Wallet;
 use Bavix\Wallet\Models\Wallet as WalletModel;
 use Bavix\Wallet\Services\WalletService;
@@ -50,7 +51,6 @@ class Transaction extends Model
      */
     protected $casts = [
         'wallet_id' => 'int',
-        'amount' => 'int',
         'confirmed' => 'bool',
         'meta' => 'json'
     ];
@@ -97,26 +97,28 @@ public function wallet(): BelongsTo
     }
 
     /**
-     * @return float
+     * @return int|float
      */
-    public function getAmountFloatAttribute(): float
+    public function getAmountFloatAttribute()
     {
         $decimalPlaces = app(WalletService::class)
             ->decimalPlaces($this->wallet);
 
-        return $this->amount / $decimalPlaces;
+        return app(Mathable::class)
+            ->div($this->amount, $decimalPlaces);
     }
 
     /**
-     * @param float $amount
-     * @return float
+     * @param int|float $amount
+     * @return void
      */
-    public function setAmountFloatAttribute(float $amount): void
+    public function setAmountFloatAttribute($amount): void
     {
+        $math = app(Mathable::class);
         $decimalPlaces = app(WalletService::class)
             ->decimalPlaces($this->wallet);
 
-        $this->amount = (int)round($amount * $decimalPlaces);
+        $this->amount = $math->round($math->mul($amount, $decimalPlaces));
     }
 
 }
diff --git a/src/Models/Transfer.php b/src/Models/Transfer.php
index f63624b09..9bfe8dbe5 100644
--- a/src/Models/Transfer.php
+++ b/src/Models/Transfer.php
@@ -56,7 +56,6 @@ class Transfer extends Model
     protected $casts = [
         'deposit_id' => 'int',
         'withdraw_id' => 'int',
-        'fee' => 'int',
     ];
 
     /**
diff --git a/src/Models/Wallet.php b/src/Models/Wallet.php
index 5067757cf..dacb42d61 100644
--- a/src/Models/Wallet.php
+++ b/src/Models/Wallet.php
@@ -54,7 +54,6 @@ class Wallet extends Model implements Customer, WalletFloat, Confirmable, Exchan
      * @var array
      */
     protected $casts = [
-        'balance' => 'int',
         'decimal_places' => 'int',
     ];
 
@@ -109,9 +108,9 @@ public function refreshBalance(): bool
     }
 
     /**
-     * @return int
+     * @return float|int
      */
-    public function getAvailableBalance(): int
+    public function getAvailableBalance()
     {
         return $this->transactions()
             ->where('wallet_id', $this->getKey())
diff --git a/src/Objects/Bring.php b/src/Objects/Bring.php
index a84993946..419ee6c95 100644
--- a/src/Objects/Bring.php
+++ b/src/Objects/Bring.php
@@ -2,6 +2,7 @@
 
 namespace Bavix\Wallet\Objects;
 
+use Bavix\Wallet\Interfaces\Mathable;
 use Bavix\Wallet\Interfaces\Wallet;
 use Bavix\Wallet\Models\Transaction;
 use Bavix\Wallet\Models\Transfer;
@@ -182,7 +183,10 @@ public function getDiscount(): int
     public function getFee(): int
     {
         if ($this->fee === null) {
-            return abs($this->getWithdraw()->amount) - abs($this->getDeposit()->amount);
+            return app(Mathable::class)->sub(
+                app(Mathable::class)->abs($this->getWithdraw()->amount),
+                app(Mathable::class)->abs($this->getDeposit()->amount)
+            );
         }
 
         return $this->fee;
@@ -192,7 +196,7 @@ public function getFee(): int
      * @param int $fee
      * @return Bring
      */
-    public function setFee(int $fee): self
+    public function setFee($fee): self
     {
         $this->fee = $fee;
         return $this;
diff --git a/src/Objects/Cart.php b/src/Objects/Cart.php
index 8a7871cef..e1d424d3c 100644
--- a/src/Objects/Cart.php
+++ b/src/Objects/Cart.php
@@ -3,6 +3,7 @@
 namespace Bavix\Wallet\Objects;
 
 use Bavix\Wallet\Interfaces\Customer;
+use Bavix\Wallet\Interfaces\Mathable;
 use Bavix\Wallet\Interfaces\Product;
 use Bavix\Wallet\Models\Transfer;
 use Countable;
@@ -23,16 +24,6 @@ class Cart implements Countable
      */
     protected $quantity = [];
 
-    /**
-     * @return static
-     * @deprecated use app(Cart::class)
-     * @codeCoverageIgnore
-     */
-    public static function make(): self
-    {
-        return new static();
-    }
-
     /**
      * @param Product $product
      * @param int $quantity
@@ -132,11 +123,12 @@ public function canBuy(Customer $customer, bool $force = null): bool
      * @param Customer $customer
      * @return int
      */
-    public function getTotal(Customer $customer): int
+    public function getTotal(Customer $customer): string
     {
         $result = 0;
+        $math = app(Mathable::class);
         foreach ($this->items as $item) {
-            $result += $item->getAmountProduct($customer);
+            $result = $math->add($result, $item->getAmountProduct($customer));
         }
         return $result;
     }
@@ -168,7 +160,8 @@ protected function addQuantity(Product $product, int $quantity): void
     {
         $class = get_class($product);
         $uniq = $product->getUniqueId();
-        $this->quantity[$class][$uniq] = $this->getQuantity($product) + $quantity;
+        $math = app(Mathable::class);
+        $this->quantity[$class][$uniq] = $math->add($this->getQuantity($product), $quantity);
     }
 
 }
diff --git a/src/Objects/Operation.php b/src/Objects/Operation.php
index d76381d6d..c61f89360 100644
--- a/src/Objects/Operation.php
+++ b/src/Objects/Operation.php
@@ -65,9 +65,9 @@ public function getUuid(): string
     }
 
     /**
-     * @return int
+     * @return float|int
      */
-    public function getAmount(): int
+    public function getAmount()
     {
         return $this->amount;
     }
@@ -102,7 +102,7 @@ public function setType(string $type): self
      * @param int $amount
      * @return static
      */
-    public function setAmount(int $amount): self
+    public function setAmount($amount): self
     {
         $this->amount = $amount;
         return $this;
diff --git a/src/Services/CommonService.php b/src/Services/CommonService.php
index fa9dcc273..c8b5b82b0 100644
--- a/src/Services/CommonService.php
+++ b/src/Services/CommonService.php
@@ -4,6 +4,7 @@
 
 use Bavix\Wallet\Exceptions\BalanceIsEmpty;
 use Bavix\Wallet\Exceptions\InsufficientFunds;
+use Bavix\Wallet\Interfaces\Mathable;
 use Bavix\Wallet\Interfaces\Storable;
 use Bavix\Wallet\Interfaces\Wallet;
 use Bavix\Wallet\Models\Transaction;
@@ -27,13 +28,14 @@ class CommonService
      * @param string $status
      * @return Transfer
      */
-    public function transfer(Wallet $from, Wallet $to, int $amount, ?array $meta = null, string $status = Transfer::STATUS_TRANSFER): Transfer
+    public function transfer(Wallet $from, Wallet $to, $amount, ?array $meta = null, string $status = Transfer::STATUS_TRANSFER): Transfer
     {
         return app(LockService::class)->lock($this, __FUNCTION__, function () use ($from, $to, $amount, $meta, $status) {
+            $math = app(Mathable::class);
             $discount = app(WalletService::class)->discount($from, $to);
-            $newAmount = max(0, $amount - $discount);
+            $newAmount = max(0, $math->sub($amount, $discount));
             $fee = app(WalletService::class)->fee($to, $newAmount);
-            $this->verifyWithdraw($from, $newAmount + $fee);
+            $this->verifyWithdraw($from, $math->add($newAmount, $fee));
             return $this->forceTransfer($from, $to, $amount, $meta, $status);
         });
     }
@@ -46,15 +48,17 @@ public function transfer(Wallet $from, Wallet $to, int $amount, ?array $meta = n
      * @param string $status
      * @return Transfer
      */
-    public function forceTransfer(Wallet $from, Wallet $to, int $amount, ?array $meta = null, string $status = Transfer::STATUS_TRANSFER): Transfer
+    public function forceTransfer(Wallet $from, Wallet $to, $amount, ?array $meta = null, string $status = Transfer::STATUS_TRANSFER): Transfer
     {
         return app(LockService::class)->lock($this, __FUNCTION__, function () use ($from, $to, $amount, $meta, $status) {
+            $math = app(Mathable::class);
             $from = app(WalletService::class)->getWallet($from);
             $discount = app(WalletService::class)->discount($from, $to);
-            $amount = max(0, $amount - $discount);
+            $amount = max(0, $math->sub($amount, $discount));
 
             $fee = app(WalletService::class)->fee($to, $amount);
-            $withdraw = $this->forceWithdraw($from, $amount + $fee, $meta);
+            $placesValue = app(WalletService::class)->decimalPlacesValue($from);
+            $withdraw = $this->forceWithdraw($from, $math->add($amount, $fee, $placesValue), $meta);
             $deposit = $this->deposit($to, $amount, $meta);
 
             $transfers = $this->multiBrings([
@@ -78,7 +82,7 @@ public function forceTransfer(Wallet $from, Wallet $to, int $amount, ?array $met
      * @param bool|null $confirmed
      * @return Transaction
      */
-    public function forceWithdraw(Wallet $wallet, int $amount, ?array $meta, bool $confirmed = true): Transaction
+    public function forceWithdraw(Wallet $wallet, $amount, ?array $meta, bool $confirmed = true): Transaction
     {
         return app(LockService::class)->lock($this, __FUNCTION__, function () use ($wallet, $amount, $meta, $confirmed) {
             $walletService = app(WalletService::class);
@@ -108,7 +112,7 @@ public function forceWithdraw(Wallet $wallet, int $amount, ?array $meta, bool $c
      * @param bool $confirmed
      * @return Transaction
      */
-    public function deposit(Wallet $wallet, int $amount, ?array $meta, bool $confirmed = true): Transaction
+    public function deposit(Wallet $wallet, $amount, ?array $meta, bool $confirmed = true): Transaction
     {
         return app(LockService::class)->lock($this, __FUNCTION__, function () use ($wallet, $amount, $meta, $confirmed) {
             $walletService = app(WalletService::class);
@@ -139,7 +143,7 @@ public function deposit(Wallet $wallet, int $amount, ?array $meta, bool $confirm
      * @throws BalanceIsEmpty
      * @throws InsufficientFunds
      */
-    public function verifyWithdraw(Wallet $wallet, int $amount, bool $allowZero = null): void
+    public function verifyWithdraw(Wallet $wallet, $amount, bool $allowZero = null): void
     {
         /**
          * @var HasWallet $wallet
@@ -165,9 +169,10 @@ public function multiOperation(Wallet $self, array $operations): array
         return app(LockService::class)->lock($this, __FUNCTION__, function () use ($self, $operations) {
             $amount = 0;
             $objects = [];
+            $math = app(Mathable::class);
             foreach ($operations as $operation) {
                 if ($operation->isConfirmed()) {
-                    $amount += $operation->getAmount();
+                    $amount = $math->add($amount, $operation->getAmount());
                 }
 
                 $objects[] = $operation
@@ -221,7 +226,7 @@ public function multiBrings(array $brings): array
      * @return bool
      * @throws
      */
-    public function addBalance(Wallet $wallet, int $amount): bool
+    public function addBalance(Wallet $wallet, $amount): bool
     {
         return app(LockService::class)->lock($this, __FUNCTION__, static function () use ($wallet, $amount) {
             /**
diff --git a/src/Services/ExchangeService.php b/src/Services/ExchangeService.php
index 8bdbf36c7..32a1bf7fe 100644
--- a/src/Services/ExchangeService.php
+++ b/src/Services/ExchangeService.php
@@ -11,9 +11,9 @@ class ExchangeService
     /**
      * @param Wallet $from
      * @param Wallet $to
-     * @return float
+     * @return int|float
      */
-    public function rate(Wallet $from, Wallet $to): float
+    public function rate(Wallet $from, Wallet $to)
     {
         return app(Rateable::class)
             ->withAmount(1)
diff --git a/src/Services/ProxyService.php b/src/Services/ProxyService.php
deleted file mode 100644
index 6a9841f46..000000000
--- a/src/Services/ProxyService.php
+++ /dev/null
@@ -1,103 +0,0 @@
-<?php
-
-namespace Bavix\Wallet\Services;
-
-use ArrayAccess;
-use Bavix\Wallet\Interfaces\Storable;
-use function array_key_exists;
-
-/**
- * Class ProxyService
- * @package Bavix\Wallet\Services
- * @codeCoverageIgnore
- * @deprecated
- */
-class ProxyService implements ArrayAccess
-{
-
-    /**
-     * @var array
-     */
-    protected $data = [];
-
-    /**
-     * @param string $key
-     * @return bool
-     */
-    public function has(string $key): bool
-    {
-        return $this->offsetExists($key);
-    }
-
-    /**
-     * @inheritDoc
-     */
-    public function offsetExists($offset): bool
-    {
-        return array_key_exists($offset, $this->data);
-    }
-
-    /**
-     * @param string $key
-     * @return int
-     */
-    public function get(string $key): int
-    {
-        return $this->offsetGet($key);
-    }
-
-    /**
-     * @inheritDoc
-     */
-    public function offsetGet($offset): int
-    {
-        return $this->data[$offset] ?? 0;
-    }
-
-    /**
-     * @param string $key
-     * @param int $value
-     * @return static
-     */
-    public function set(string $key, int $value): self
-    {
-        $this->offsetSet($key, $value);
-        return $this;
-    }
-
-    /**
-     * @inheritDoc
-     */
-    public function offsetSet($offset, $value): void
-    {
-        $this->data[$offset] = $value;
-    }
-
-    /**
-     * @param string $key
-     * @return static
-     */
-    public function remove(string $key): self
-    {
-        $this->offsetUnset($key);
-        return $this;
-    }
-
-    /**
-     * @inheritDoc
-     */
-    public function offsetUnset($offset): void
-    {
-        unset($this->data[$offset]);
-    }
-
-    /**
-     * @return void
-     */
-    public function fresh(): void
-    {
-        app()->instance(Storable::class, null);
-        $this->data = [];
-    }
-
-}
diff --git a/src/Services/WalletService.php b/src/Services/WalletService.php
index 96da46415..6ec7530dd 100644
--- a/src/Services/WalletService.php
+++ b/src/Services/WalletService.php
@@ -5,6 +5,7 @@
 use Bavix\Wallet\Exceptions\AmountInvalid;
 use Bavix\Wallet\Interfaces\Customer;
 use Bavix\Wallet\Interfaces\Discount;
+use Bavix\Wallet\Interfaces\Mathable;
 use Bavix\Wallet\Interfaces\MinimalTaxable;
 use Bavix\Wallet\Interfaces\Storable;
 use Bavix\Wallet\Interfaces\Taxable;
@@ -35,10 +36,19 @@ public function discount(Wallet $customer, Wallet $product): int
      * @param Wallet $object
      * @return int
      */
-    public function decimalPlaces(Wallet $object): int
+    public function decimalPlacesValue(Wallet $object): int
     {
-        $decimalPlaces = $this->getWallet($object)->decimal_places ?: 2;
-        return 10 ** $decimalPlaces;
+        return $this->getWallet($object)->decimal_places ?: 2;
+    }
+
+    /**
+     * @param Wallet $object
+     * @return string
+     */
+    public function decimalPlaces(Wallet $object): string
+    {
+        return app(Mathable::class)
+            ->pow(10, $this->decimalPlacesValue($object));
     }
 
     /**
@@ -46,13 +56,21 @@ public function decimalPlaces(Wallet $object): int
      *
      * @param Wallet $wallet
      * @param int $amount
-     * @return int
+     * @return float|int
      */
-    public function fee(Wallet $wallet, int $amount): int
+    public function fee(Wallet $wallet, $amount)
     {
         $fee = 0;
+        $math = app(Mathable::class);
         if ($wallet instanceof Taxable) {
-            $fee = (int)($amount * $wallet->getFeePercent() / 100);
+            $placesValue = $this->decimalPlacesValue($wallet);
+            $fee = $math->floor(
+                $math->div(
+                    $math->mul($amount, $wallet->getFeePercent(), 0),
+                    100,
+                    $placesValue
+                )
+            );
         }
 
         /**
@@ -62,7 +80,7 @@ public function fee(Wallet $wallet, int $amount): int
          */
         if ($wallet instanceof MinimalTaxable) {
             $minimal = $wallet->getMinimalFee();
-            if ($fee < $minimal) {
+            if (app(Mathable::class)->compare($fee, $minimal) === -1) {
                 $fee = $minimal;
             }
         }
@@ -76,9 +94,9 @@ public function fee(Wallet $wallet, int $amount): int
      * @param int $amount
      * @throws
      */
-    public function checkAmount(int $amount): void
+    public function checkAmount($amount): void
     {
-        if ($amount < 0) {
+        if (app(Mathable::class)->compare($amount, 0) === -1) {
             throw new AmountInvalid(trans('wallet::errors.price_positive'));
         }
     }
@@ -109,17 +127,6 @@ public function getWallet(Wallet $object, bool $autoSave = true): WalletModel
         return $wallet;
     }
 
-    /**
-     * @param Wallet $object
-     * @return int
-     * @deprecated use Storable::getBalance
-     */
-    public function getBalance(Wallet $object): int
-    {
-        return app(Storable::class)
-            ->getBalance($object);
-    }
-
     /**
      * @param WalletModel $wallet
      * @return bool
@@ -127,12 +134,14 @@ public function getBalance(Wallet $object): int
     public function refresh(WalletModel $wallet): bool
     {
         return app(LockService::class)->lock($this, __FUNCTION__, static function () use ($wallet) {
+            $math = app(Mathable::class);
             app(Storable::class)->getBalance($wallet);
+            $whatIs = $wallet->balance;
             $balance = $wallet->getAvailableBalance();
             $wallet->balance = $balance;
 
             return app(Storable::class)->setBalance($wallet, $balance) &&
-                $wallet->save();
+                (!$math->compare($whatIs, $balance) || $wallet->save());
         });
     }
 
diff --git a/src/Simple/BCMath.php b/src/Simple/BCMath.php
new file mode 100644
index 000000000..47f3761e6
--- /dev/null
+++ b/src/Simple/BCMath.php
@@ -0,0 +1,148 @@
+<?php
+
+namespace Bavix\Wallet\Simple;
+
+/**
+ * Class BCMath
+ * @package Bavix\Wallet\Simple
+ */
+class BCMath extends Math
+{
+
+    /**
+     * @inheritDoc
+     */
+    public function add($first, $second, ?int $scale = null): string
+    {
+        return bcadd($first, $second, $this->scale($scale));
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function sub($first, $second, ?int $scale = null): string
+    {
+        return bcsub($first, $second, $this->scale($scale));
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function div($first, $second, ?int $scale = null): string
+    {
+        return bcdiv($first, $second, $this->scale($scale));
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function mul($first, $second, ?int $scale = null): string
+    {
+        return bcmul($first, $second, $this->scale($scale));
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function pow($first, $second, ?int $scale = null): string
+    {
+        return bcpow($first, $second, $this->scale($scale));
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function ceil($number): string
+    {
+        if (strpos($number, '.') === false) {
+            return $number;
+        }
+
+        if (preg_match("~\.[0]+$~", $number)) {
+            return $this->round($number, 0);
+        }
+
+        if ($this->isNegative($number)) {
+            return bcsub($number, 0, 0);
+        }
+
+        return bcadd($number, 1, 0);
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function floor($number): string
+    {
+        if (strpos($number, '.') === false) {
+            return $number;
+        }
+
+        if (preg_match("~\.[0]+$~", $number)) {
+            return $this->round($number, 0);
+        }
+
+        if ($this->isNegative($number)) {
+            return bcsub($number, 1, 0);
+        }
+
+        return bcadd($number, 0, 0);
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function round($number, int $precision = 0): string
+    {
+        if (strpos($number, '.') === false) {
+            return $number;
+        }
+
+        if ($this->isNegative($number)) {
+            return bcsub($number, '0.' . str_repeat('0', $precision) . '5', $precision);
+        }
+
+        return bcadd($number, '0.' . str_repeat('0', $precision) . '5', $precision);
+    }
+
+    /**
+     * @param float|int|string $number
+     * @return string
+     */
+    public function abs($number): string
+    {
+        if (!preg_match('~^-?\d*(\.\d*)?$~', $number, $matches)) {
+            return 0;
+        }
+
+        $digits = $matches[0] ?? '0';
+        $division = $matches[1] ?? '.';
+        if ($digits === '.' && $division === '.') {
+            return 0;
+        }
+
+        if ($this->isNegative($number)) {
+            return substr($number, 1);
+        }
+
+        return $number;
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function compare($first, $second): int
+    {
+        return bccomp($first, $second, $this->scale());
+    }
+
+    /**
+     * @param $number
+     * @return bool
+     */
+    protected function isNegative($number): bool
+    {
+        return strpos($number, '-') === 0;
+    }
+
+}
diff --git a/src/Simple/Math.php b/src/Simple/Math.php
new file mode 100644
index 000000000..8cadd962e
--- /dev/null
+++ b/src/Simple/Math.php
@@ -0,0 +1,138 @@
+<?php
+
+namespace Bavix\Wallet\Simple;
+
+use Bavix\Wallet\Interfaces\Mathable;
+
+/**
+ * Class MathService
+ * @package Bavix\Wallet\Simple
+ */
+class Math implements Mathable
+{
+
+    /**
+     * @var int
+     */
+    protected $scale;
+
+    /**
+     * @param string|int|float $first
+     * @param string|int|float $second
+     * @param null|int $scale
+     * @return string
+     */
+    public function add($first, $second, ?int $scale = null): string
+    {
+        return $this->round($first + $second, $this->scale($scale));
+    }
+
+    /**
+     * @param string|int|float $first
+     * @param string|int|float $second
+     * @param null|int $scale
+     * @return string
+     */
+    public function sub($first, $second, ?int $scale = null): string
+    {
+        return $this->round($first - $second, $this->scale($scale));
+    }
+
+    /**
+     * @param string|int|float $first
+     * @param string|int|float $second
+     * @param null|int $scale
+     * @return float|int|string|null
+     */
+    public function div($first, $second, ?int $scale = null): string
+    {
+        return $this->round($first / $second, $this->scale($scale));
+    }
+
+    /**
+     * @param string|int|float $first
+     * @param string|int|float $second
+     * @param null|int $scale
+     * @return float|int|string
+     */
+    public function mul($first, $second, ?int $scale = null): string
+    {
+        return $this->round($first * $second, $this->scale($scale));
+    }
+
+    /**
+     * @param string|int|float $first
+     * @param string|int|float $second
+     * @param null|int $scale
+     * @return string
+     */
+    public function pow($first, $second, ?int $scale = null): string
+    {
+        return $this->round($first ** $second, $this->scale($scale));
+    }
+
+    /**
+     * @param string|int|float $number
+     * @return string
+     */
+    public function ceil($number): string
+    {
+        return ceil($number);
+    }
+
+    /**
+     * @param string|int|float $number
+     * @return string
+     */
+    public function floor($number): string
+    {
+        return floor($number);
+    }
+
+    /**
+     * @param float|int|string $number
+     * @return string
+     */
+    public function abs($number): string
+    {
+        return abs($number);
+    }
+
+    /**
+     * @param string|int|float $number
+     * @param int $precision
+     * @return string
+     */
+    public function round($number, int $precision = 0): string
+    {
+        return round($number, $precision);
+    }
+
+    /**
+     * @param $first
+     * @param $second
+     * @return int
+     */
+    public function compare($first, $second): int
+    {
+        return $first <=> $second;
+    }
+
+    /**
+     * @param int $scale
+     * @return int
+     */
+    protected function scale(?int $scale = null): int
+    {
+        if ($scale !== null) {
+            return $scale;
+        }
+
+        if ($this->scale === null) {
+            $this->scale = (int)config('wallet.math.scale', 64);
+        }
+
+        return $this->scale;
+    }
+
+}
diff --git a/src/Simple/Rate.php b/src/Simple/Rate.php
index 4a9cba62b..43aaa4d75 100644
--- a/src/Simple/Rate.php
+++ b/src/Simple/Rate.php
@@ -25,7 +25,7 @@ class Rate implements Rateable
     /**
      * @inheritDoc
      */
-    public function withAmount(int $amount): Rateable
+    public function withAmount($amount): Rateable
     {
         $this->amount = $amount;
         return $this;
@@ -43,7 +43,7 @@ public function withCurrency(Wallet $wallet): Rateable
     /**
      * @inheritDoc
      */
-    public function convertTo(Wallet $wallet): float
+    public function convertTo(Wallet $wallet)
     {
         return $this->amount;
     }
diff --git a/src/Simple/Store.php b/src/Simple/Store.php
index e33cd03c5..9116936d5 100644
--- a/src/Simple/Store.php
+++ b/src/Simple/Store.php
@@ -2,6 +2,7 @@
 
 namespace Bavix\Wallet\Simple;
 
+use Bavix\Wallet\Interfaces\Mathable;
 use Bavix\Wallet\Interfaces\Storable;
 use Bavix\Wallet\Services\WalletService;
 
@@ -16,14 +17,14 @@ class Store implements Storable
     /**
      * @inheritDoc
      */
-    public function getBalance($object): int
+    public function getBalance($object)
     {
         $wallet = app(WalletService::class)->getWallet($object);
         if (!\array_key_exists($wallet->getKey(), $this->balanceSheets)) {
             $balance = method_exists($wallet, 'getRawOriginal') ?
                 $wallet->getRawOriginal('balance', 0) : $wallet->getOriginal('balance', 0);
 
-            $this->balanceSheets[$wallet->getKey()] = (int)$balance;
+            $this->balanceSheets[$wallet->getKey()] = app(Mathable::class)->round($balance);
         }
 
         return $this->balanceSheets[$wallet->getKey()];
@@ -32,9 +33,10 @@ public function getBalance($object): int
     /**
      * @inheritDoc
      */
-    public function incBalance($object, int $amount): int
+    public function incBalance($object, $amount)
     {
-        $balance = $this->getBalance($object) + $amount;
+        $math = app(Mathable::class);
+        $balance = $math->add($this->getBalance($object), $amount);
         $this->setBalance($object, $balance);
         return $balance;
     }
@@ -42,10 +44,10 @@ public function incBalance($object, int $amount): int
     /**
      * @inheritDoc
      */
-    public function setBalance($object, int $amount): bool
+    public function setBalance($object, $amount): bool
     {
         $wallet = app(WalletService::class)->getWallet($object);
-        $this->balanceSheets[$wallet->getKey()] = $amount;
+        $this->balanceSheets[$wallet->getKey()] = app(Mathable::class)->round($amount ?: 0);
         return true;
     }
 
diff --git a/src/Traits/CanExchange.php b/src/Traits/CanExchange.php
index 20f545a23..a7f6e7106 100644
--- a/src/Traits/CanExchange.php
+++ b/src/Traits/CanExchange.php
@@ -2,6 +2,7 @@
 
 namespace Bavix\Wallet\Traits;
 
+use Bavix\Wallet\Interfaces\Mathable;
 use Bavix\Wallet\Interfaces\Wallet;
 use Bavix\Wallet\Models\Transfer;
 use Bavix\Wallet\Objects\Bring;
@@ -17,7 +18,7 @@ trait CanExchange
     /**
      * @inheritDoc
      */
-    public function exchange(Wallet $to, int $amount, ?array $meta = null): Transfer
+    public function exchange(Wallet $to, $amount, ?array $meta = null): Transfer
     {
         $wallet = app(WalletService::class)
             ->getWallet($this);
@@ -31,7 +32,7 @@ public function exchange(Wallet $to, int $amount, ?array $meta = null): Transfer
     /**
      * @inheritDoc
      */
-    public function safeExchange(Wallet $to, int $amount, ?array $meta = null): ?Transfer
+    public function safeExchange(Wallet $to, $amount, ?array $meta = null): ?Transfer
     {
         try {
             return $this->exchange($to, $amount, $meta);
@@ -43,23 +44,24 @@ public function safeExchange(Wallet $to, int $amount, ?array $meta = null): ?Tra
     /**
      * @inheritDoc
      */
-    public function forceExchange(Wallet $to, int $amount, ?array $meta = null): Transfer
+    public function forceExchange(Wallet $to, $amount, ?array $meta = null): Transfer
     {
         /**
          * @var Wallet $from
          */
         $from = app(WalletService::class)->getWallet($this);
 
-        return app(LockService::class)->lock($this, __FUNCTION__, function () use ($from, $to, $amount, $meta) {
+        return app(LockService::class)->lock($this, __FUNCTION__, static function () use ($from, $to, $amount, $meta) {
             return app(DbService::class)->transaction(static function () use ($from, $to, $amount, $meta) {
+                $math = app(Mathable::class);
                 $rate = app(ExchangeService::class)->rate($from, $to);
                 $fee = app(WalletService::class)->fee($to, $amount);
 
                 $withdraw = app(CommonService::class)
-                    ->forceWithdraw($from, $amount + $fee, $meta);
+                    ->forceWithdraw($from, $math->add($amount, $fee), $meta);
 
                 $deposit = app(CommonService::class)
-                    ->deposit($to, $amount * $rate, $meta);
+                    ->deposit($to, $math->floor($math->mul($amount, $rate, 1)), $meta);
 
                 $transfers = app(CommonService::class)->multiBrings([
                     app(Bring::class)
diff --git a/src/Traits/HasGift.php b/src/Traits/HasGift.php
index 01504bcfd..8c1422f69 100644
--- a/src/Traits/HasGift.php
+++ b/src/Traits/HasGift.php
@@ -2,6 +2,7 @@
 
 namespace Bavix\Wallet\Traits;
 
+use Bavix\Wallet\Interfaces\Mathable;
 use Bavix\Wallet\Interfaces\Product;
 use Bavix\Wallet\Interfaces\Wallet;
 use Bavix\Wallet\Models\Transfer;
@@ -64,8 +65,9 @@ public function gift(Wallet $to, Product $product, bool $force = null): Transfer
              * That's why I address him like this!
              */
             return app(DbService::class)->transaction(static function () use ($santa, $to, $product, $force) {
+                $math = app(Mathable::class);
                 $discount = app(WalletService::class)->discount($santa, $product);
-                $amount = $product->getAmountProduct($santa) - $discount;
+                $amount = $math->sub($product->getAmountProduct($santa), $discount);
                 $meta = $product->getMetaProduct();
                 $fee = app(WalletService::class)
                     ->fee($product, $amount);
@@ -76,10 +78,10 @@ public function gift(Wallet $to, Product $product, bool $force = null): Transfer
                  * Santa pays taxes
                  */
                 if (!$force) {
-                    $commonService->verifyWithdraw($santa, $amount + $fee);
+                    $commonService->verifyWithdraw($santa, $math->add($amount, $fee));
                 }
 
-                $withdraw = $commonService->forceWithdraw($santa, $amount + $fee, $meta);
+                $withdraw = $commonService->forceWithdraw($santa, $math->add($amount, $fee), $meta);
                 $deposit = $commonService->deposit($product, $amount, $meta);
 
                 $from = app(WalletService::class)
diff --git a/src/Traits/HasWallet.php b/src/Traits/HasWallet.php
index c560a916e..868c6b1fb 100644
--- a/src/Traits/HasWallet.php
+++ b/src/Traits/HasWallet.php
@@ -2,6 +2,7 @@
 
 namespace Bavix\Wallet\Traits;
 
+use Bavix\Wallet\Interfaces\Mathable;
 use Bavix\Wallet\Interfaces\Storable;
 use Bavix\Wallet\Interfaces\Wallet;
 use Bavix\Wallet\Models\Transaction;
@@ -39,7 +40,7 @@ trait HasWallet
      * @return Transaction
      * @throws
      */
-    public function deposit(int $amount, ?array $meta = null, bool $confirmed = true): Transaction
+    public function deposit($amount, ?array $meta = null, bool $confirmed = true): Transaction
     {
         $self = $this;
         return app(DbService::class)->transaction(static function () use ($self, $amount, $meta, $confirmed) {
@@ -69,10 +70,10 @@ public function deposit(int $amount, ?array $meta = null, bool $confirmed = true
      *  $user2->deposit(100);
      *  var_dump($user2->balance); // 300
      *
-     * @return int
+     * @return int|float
      * @throws
      */
-    public function getBalanceAttribute(): int
+    public function getBalanceAttribute()
     {
         return app(Storable::class)->getBalance($this);
     }
@@ -96,7 +97,7 @@ public function transactions(): MorphMany
      * @param array|null $meta
      * @return null|Transfer
      */
-    public function safeTransfer(Wallet $wallet, int $amount, ?array $meta = null): ?Transfer
+    public function safeTransfer(Wallet $wallet, $amount, ?array $meta = null): ?Transfer
     {
         try {
             return $this->transfer($wallet, $amount, $meta);
@@ -114,7 +115,7 @@ public function safeTransfer(Wallet $wallet, int $amount, ?array $meta = null):
      * @return Transfer
      * @throws
      */
-    public function transfer(Wallet $wallet, int $amount, ?array $meta = null): Transfer
+    public function transfer(Wallet $wallet, $amount, ?array $meta = null): Transfer
     {
         app(CommonService::class)->verifyWithdraw($this, $amount);
         return $this->forceTransfer($wallet, $amount, $meta);
@@ -129,7 +130,7 @@ public function transfer(Wallet $wallet, int $amount, ?array $meta = null): Tran
      *
      * @return Transaction
      */
-    public function withdraw(int $amount, ?array $meta = null, bool $confirmed = true): Transaction
+    public function withdraw($amount, ?array $meta = null, bool $confirmed = true): Transaction
     {
         app(CommonService::class)->verifyWithdraw($this, $amount);
         return $this->forceWithdraw($amount, $meta, $confirmed);
@@ -142,7 +143,7 @@ public function withdraw(int $amount, ?array $meta = null, bool $confirmed = tru
      * @param bool $allowZero
      * @return bool
      */
-    public function canWithdraw(int $amount, bool $allowZero = null): bool
+    public function canWithdraw($amount, bool $allowZero = null): bool
     {
         /**
          * Allow to buy for free with a negative balance
@@ -151,7 +152,7 @@ public function canWithdraw(int $amount, bool $allowZero = null): bool
             return true;
         }
 
-        return $this->balance >= $amount;
+        return app(Mathable::class)->compare($this->balance, $amount) >= 0;
     }
 
     /**
@@ -164,7 +165,7 @@ public function canWithdraw(int $amount, bool $allowZero = null): bool
      * @return Transaction
      * @throws
      */
-    public function forceWithdraw(int $amount, ?array $meta = null, bool $confirmed = true): Transaction
+    public function forceWithdraw($amount, ?array $meta = null, bool $confirmed = true): Transaction
     {
         $self = $this;
         return app(DbService::class)->transaction(static function () use ($self, $amount, $meta, $confirmed) {
@@ -183,7 +184,7 @@ public function forceWithdraw(int $amount, ?array $meta = null, bool $confirmed
      * @return Transfer
      * @throws
      */
-    public function forceTransfer(Wallet $wallet, int $amount, ?array $meta = null): Transfer
+    public function forceTransfer(Wallet $wallet, $amount, ?array $meta = null): Transfer
     {
         $self = $this;
         return app(DbService::class)->transaction(static function () use ($self, $amount, $wallet, $meta) {
diff --git a/src/Traits/HasWalletFloat.php b/src/Traits/HasWalletFloat.php
index 600f1314a..34a7444c9 100644
--- a/src/Traits/HasWalletFloat.php
+++ b/src/Traits/HasWalletFloat.php
@@ -2,6 +2,7 @@
 
 namespace Bavix\Wallet\Traits;
 
+use Bavix\Wallet\Interfaces\Mathable;
 use Bavix\Wallet\Interfaces\Wallet;
 use Bavix\Wallet\Models\Transaction;
 use Bavix\Wallet\Models\Transfer;
@@ -25,10 +26,13 @@ trait HasWalletFloat
      *
      * @return Transaction
      */
-    public function forceWithdrawFloat(float $amount, ?array $meta = null, bool $confirmed = true): Transaction
+    public function forceWithdrawFloat($amount, ?array $meta = null, bool $confirmed = true): Transaction
     {
+        $math = app(Mathable::class);
+        $decimalPlacesValue = app(WalletService::class)->decimalPlacesValue($this);
         $decimalPlaces = app(WalletService::class)->decimalPlaces($this);
-        return $this->forceWithdraw((int)round($amount * $decimalPlaces), $meta, $confirmed);
+        $result = $math->round($math->mul($amount, $decimalPlaces, $decimalPlacesValue));
+        return $this->forceWithdraw($result, $meta, $confirmed);
     }
 
     /**
@@ -38,10 +42,13 @@ public function forceWithdrawFloat(float $amount, ?array $meta = null, bool $con
      *
      * @return Transaction
      */
-    public function depositFloat(float $amount, ?array $meta = null, bool $confirmed = true): Transaction
+    public function depositFloat($amount, ?array $meta = null, bool $confirmed = true): Transaction
     {
+        $math = app(Mathable::class);
+        $decimalPlacesValue = app(WalletService::class)->decimalPlacesValue($this);
         $decimalPlaces = app(WalletService::class)->decimalPlaces($this);
-        return $this->deposit((int)round($amount * $decimalPlaces), $meta, $confirmed);
+        $result = $math->round($math->mul($amount, $decimalPlaces, $decimalPlacesValue));
+        return $this->deposit($result, $meta, $confirmed);
     }
 
     /**
@@ -51,20 +58,26 @@ public function depositFloat(float $amount, ?array $meta = null, bool $confirmed
      *
      * @return Transaction
      */
-    public function withdrawFloat(float $amount, ?array $meta = null, bool $confirmed = true): Transaction
+    public function withdrawFloat($amount, ?array $meta = null, bool $confirmed = true): Transaction
     {
+        $math = app(Mathable::class);
+        $decimalPlacesValue = app(WalletService::class)->decimalPlacesValue($this);
         $decimalPlaces = app(WalletService::class)->decimalPlaces($this);
-        return $this->withdraw((int)round($amount * $decimalPlaces), $meta, $confirmed);
+        $result = $math->round($math->mul($amount, $decimalPlaces, $decimalPlacesValue));
+        return $this->withdraw($result, $meta, $confirmed);
     }
 
     /**
      * @param float $amount
      * @return bool
      */
-    public function canWithdrawFloat(float $amount): bool
+    public function canWithdrawFloat($amount): bool
     {
+        $math = app(Mathable::class);
+        $decimalPlacesValue = app(WalletService::class)->decimalPlacesValue($this);
         $decimalPlaces = app(WalletService::class)->decimalPlaces($this);
-        return $this->canWithdraw((int)round($amount * $decimalPlaces));
+        $result = $math->round($math->mul($amount, $decimalPlaces, $decimalPlacesValue));
+        return $this->canWithdraw($result);
     }
 
     /**
@@ -74,10 +87,13 @@ public function canWithdrawFloat(float $amount): bool
      * @return Transfer
      * @throws
      */
-    public function transferFloat(Wallet $wallet, float $amount, ?array $meta = null): Transfer
+    public function transferFloat(Wallet $wallet, $amount, ?array $meta = null): Transfer
     {
+        $math = app(Mathable::class);
+        $decimalPlacesValue = app(WalletService::class)->decimalPlacesValue($this);
         $decimalPlaces = app(WalletService::class)->decimalPlaces($this);
-        return $this->transfer($wallet, (int)round($amount * $decimalPlaces), $meta);
+        $result = $math->round($math->mul($amount, $decimalPlaces, $decimalPlacesValue));
+        return $this->transfer($wallet, $result, $meta);
     }
 
     /**
@@ -86,10 +102,13 @@ public function transferFloat(Wallet $wallet, float $amount, ?array $meta = null
      * @param array|null $meta
      * @return null|Transfer
      */
-    public function safeTransferFloat(Wallet $wallet, float $amount, ?array $meta = null): ?Transfer
+    public function safeTransferFloat(Wallet $wallet, $amount, ?array $meta = null): ?Transfer
     {
+        $math = app(Mathable::class);
+        $decimalPlacesValue = app(WalletService::class)->decimalPlacesValue($this);
         $decimalPlaces = app(WalletService::class)->decimalPlaces($this);
-        return $this->safeTransfer($wallet, (int)round($amount * $decimalPlaces), $meta);
+        $result = $math->round($math->mul($amount, $decimalPlaces, $decimalPlacesValue));
+        return $this->safeTransfer($wallet, $result, $meta);
     }
 
     /**
@@ -98,19 +117,24 @@ public function safeTransferFloat(Wallet $wallet, float $amount, ?array $meta =
      * @param array|null $meta
      * @return Transfer
      */
-    public function forceTransferFloat(Wallet $wallet, float $amount, ?array $meta = null): Transfer
+    public function forceTransferFloat(Wallet $wallet, $amount, ?array $meta = null): Transfer
     {
+        $math = app(Mathable::class);
+        $decimalPlacesValue = app(WalletService::class)->decimalPlacesValue($this);
         $decimalPlaces = app(WalletService::class)->decimalPlaces($this);
-        return $this->forceTransfer($wallet, (int)round($amount * $decimalPlaces), $meta);
+        $result = $math->round($math->mul($amount, $decimalPlaces, $decimalPlacesValue));
+        return $this->forceTransfer($wallet, $result, $meta);
     }
 
     /**
-     * @return float
+     * @return int|float
      */
-    public function getBalanceFloatAttribute(): float
+    public function getBalanceFloatAttribute()
     {
+        $math = app(Mathable::class);
+        $decimalPlacesValue = app(WalletService::class)->decimalPlacesValue($this);
         $decimalPlaces = app(WalletService::class)->decimalPlaces($this);
-        return $this->balance / $decimalPlaces;
+        return $math->div($this->balance, $decimalPlaces, $decimalPlacesValue);
     }
 
 }
diff --git a/src/WalletServiceProvider.php b/src/WalletServiceProvider.php
index 3b61ca107..81d29a33f 100644
--- a/src/WalletServiceProvider.php
+++ b/src/WalletServiceProvider.php
@@ -3,6 +3,7 @@
 namespace Bavix\Wallet;
 
 use Bavix\Wallet\Commands\RefreshBalance;
+use Bavix\Wallet\Interfaces\Mathable;
 use Bavix\Wallet\Interfaces\Rateable;
 use Bavix\Wallet\Interfaces\Storable;
 use Bavix\Wallet\Models\Transaction;
@@ -16,7 +17,7 @@
 use Bavix\Wallet\Services\DbService;
 use Bavix\Wallet\Services\ExchangeService;
 use Bavix\Wallet\Services\LockService;
-use Bavix\Wallet\Services\ProxyService;
+use Bavix\Wallet\Simple\Math;
 use Bavix\Wallet\Services\WalletService;
 use Bavix\Wallet\Simple\Rate;
 use Bavix\Wallet\Simple\Store;
@@ -87,10 +88,10 @@ public function register(): void
         // Bind eloquent models to IoC container
         $this->app->singleton(Rateable::class, config('wallet.package.rateable', Rate::class));
         $this->app->singleton(Storable::class, config('wallet.package.storable', Store::class));
+        $this->app->singleton(Mathable::class, config('wallet.package.mathable', Math::class));
         $this->app->singleton(DbService::class, config('wallet.services.db', DbService::class));
         $this->app->singleton(ExchangeService::class, config('wallet.services.exchange', ExchangeService::class));
         $this->app->singleton(CommonService::class, config('wallet.services.common', CommonService::class));
-        $this->app->singleton(ProxyService::class, config('wallet.services.proxy', ProxyService::class));
         $this->app->singleton(WalletService::class, config('wallet.services.wallet', WalletService::class));
         $this->app->singleton(LockService::class, config('wallet.services.lock', LockService::class));
 
diff --git a/tests/BalanceTest.php b/tests/BalanceTest.php
index ca05c2004..2b87b669d 100644
--- a/tests/BalanceTest.php
+++ b/tests/BalanceTest.php
@@ -5,8 +5,7 @@
 use Bavix\Wallet\Interfaces\Storable;
 use Bavix\Wallet\Models\Wallet;
 use Bavix\Wallet\Services\CommonService;
-use Bavix\Wallet\Services\ProxyService;
-use Bavix\Wallet\Services\WalletService;
+use Bavix\Wallet\Simple\Store;
 use Bavix\Wallet\Test\Models\Buyer;
 use Bavix\Wallet\Test\Models\UserMulti;
 use Illuminate\Support\Facades\DB;
@@ -112,7 +111,6 @@ public function testSimple(): void
     /**
      * @return void
      * @throws
-     * @deprecated
      */
     public function testGetBalance(): void
     {
@@ -128,7 +126,6 @@ public function testGetBalance(): void
         $this->assertTrue($wallet->exists);
 
         $this->assertEquals(0, app(Storable::class)->getBalance($wallet));
-        $this->assertEquals(0, app(WalletService::class)->getBalance($wallet));
     }
 
     /**
@@ -226,7 +223,6 @@ public function testArtisanRefresh(): void
         }
 
         // fresh balance
-        app(ProxyService::class)->fresh();
         DB::table(config('wallet.wallet.table'))
             ->update(['balance' => 0]);
 
@@ -256,13 +252,30 @@ public function testForceUpdate(): void
         Wallet::whereKey($buyer->wallet->getKey())
             ->update(['balance' => 10]);
 
-        app(ProxyService::class)->fresh();
+        /**
+         * Create a state when the cache is empty.
+         * For example, something went wrong and your database has incorrect data.
+         * Unfortunately, the library will work with what is.
+         * But there is an opportunity to recount the balance.
+         *
+         * Here is an example:
+         */
+        app()->singleton(Storable::class, Store::class);
+        $this->assertEquals($wallet->getRawOriginal('balance'), 1000);
 
+        /**
+         * We load the model from the base and our balance is 10.
+         */
         $wallet->refresh();
         $this->assertEquals($wallet->balance, 10);
+        $this->assertEquals($wallet->getRawOriginal('balance'), 10);
 
+        /**
+         * Now we fill the cache with relevant data (PS, the data inside the model will be updated).
+         */
         $wallet->refreshBalance();
         $this->assertEquals($wallet->balance, 1000);
+        $this->assertEquals($wallet->getRawOriginal('balance'), 1000);
     }
 
 }
diff --git a/tests/Common/Rate.php b/tests/Common/Rate.php
index c27e3bf6d..37b2d06f7 100644
--- a/tests/Common/Rate.php
+++ b/tests/Common/Rate.php
@@ -2,6 +2,7 @@
 
 namespace Bavix\Wallet\Test\Common;
 
+use Bavix\Wallet\Interfaces\Mathable;
 use Bavix\Wallet\Interfaces\Wallet;
 use Bavix\Wallet\Services\WalletService;
 use Illuminate\Support\Arr;
@@ -26,7 +27,7 @@ public function __construct()
         foreach ($this->rates as $from => $rates) {
             foreach ($rates as $to => $rate) {
                 if (empty($this->rates[$to][$from])) {
-                    $this->rates[$to][$from] = 1 / $rate;
+                    $this->rates[$to][$from] = app(Mathable::class)->div(1, $rate);
                 }
             }
         }
@@ -34,9 +35,9 @@ public function __construct()
 
     /**
      * @param Wallet $wallet
-     * @return float
+     * @return int|float
      */
-    protected function rate(Wallet $wallet): float
+    protected function rate(Wallet $wallet)
     {
         $from = app(WalletService::class)->getWallet($this->withCurrency);
         $to = app(WalletService::class)->getWallet($wallet);
@@ -54,9 +55,12 @@ protected function rate(Wallet $wallet): float
     /**
      * @inheritDoc
      */
-    public function convertTo(Wallet $wallet): float
+    public function convertTo(Wallet $wallet)
     {
-        return parent::convertTo($wallet) * $this->rate($wallet);
+        return app(Mathable::class)->mul(
+            parent::convertTo($wallet),
+            $this->rate($wallet)
+        );
     }
 
 }
diff --git a/tests/MathTest.php b/tests/MathTest.php
new file mode 100644
index 000000000..5f283ae42
--- /dev/null
+++ b/tests/MathTest.php
@@ -0,0 +1,512 @@
+<?php
+
+namespace Bavix\Wallet\Test;
+
+use Bavix\Wallet\Interfaces\Mathable;
+use Bavix\Wallet\Simple\BCMath;
+use Bavix\Wallet\Simple\Math;
+
+class MathTest extends TestCase
+{
+
+    /**
+     * @dataProvider dataProvider
+     * @param string $class
+     * @return void
+     */
+    public function testAbs(string $class): void
+    {
+        /**
+         * @var Mathable $provider
+         */
+        $provider = app($class);
+
+        // not number
+        $this->assertEquals($provider->abs('.'), 0);
+        $this->assertEquals($provider->abs('hello'), 0);
+        $this->assertEquals($provider->abs('--121'), 0);
+        $this->assertEquals($provider->abs('---121'), 0);
+
+        // int
+        $this->assertEquals($provider->abs(123), 123);
+        $this->assertEquals($provider->abs(-123), 123);
+
+        // float
+        $this->assertEquals($provider->abs(.0), 0);
+        $this->assertEquals($provider->abs(123.0), 123);
+        $this->assertEquals($provider->abs(123.11), 123.11);
+        $this->assertEquals($provider->abs(-123.11), 123.11);
+
+        // string
+        $this->assertEquals($provider->abs('123.'), 123);
+        $this->assertEquals($provider->abs('.11'), .11);
+        $this->assertEquals($provider->abs('123.11'), 123.11);
+        $this->assertEquals($provider->abs('-123.11'), 123.11);
+    }
+
+    /**
+     * @dataProvider dataProvider
+     * @param string $class
+     * @return void
+     */
+    public function testCompare(string $class): void
+    {
+        /**
+         * @var Mathable $provider
+         */
+        $provider = app($class);
+
+        // int
+        $this->assertEquals($provider->compare(1, 1), 0);
+        $this->assertEquals($provider->compare(1, 2), -1);
+        $this->assertEquals($provider->compare(2, 1), 1);
+
+        // float
+        $this->assertEquals($provider->compare(1.33, 1.33), 0);
+        $this->assertEquals($provider->compare(1.44, 2), -1);
+        $this->assertEquals($provider->compare(2, 1.44), 1);
+
+        // string
+        $this->assertEquals($provider->compare('1.33', '1.33'), 0);
+        $this->assertEquals($provider->compare('1.44', '2'), -1);
+        $this->assertEquals($provider->compare('2', '1.44'), 1);
+    }
+
+    /**
+     * @dataProvider dataProvider
+     * @param string $class
+     * @return void
+     */
+    public function testAdd(string $class): void
+    {
+        /**
+         * @var Mathable $provider
+         */
+        $provider = app($class);
+
+        // int
+        $this->assertEquals($provider->compare($provider->add(1, 5), 6), 0);
+        $this->assertEquals($provider->compare($provider->add(-1, 5), 4), 0);
+
+        // float
+        $this->assertEquals($provider->compare($provider->add(1.17, 4.83), 6.), 0);
+        $this->assertEquals($provider->compare($provider->add(-1.44, 5.43), 3.99), 0);
+
+        if ($provider instanceof BCMath) {
+            $this->assertEquals(
+                $provider->compare(
+                    $provider->add('4.331733759839529271053448625299468628', 1.4),
+                    '5.731733759839529271053448625299468628'
+                ),
+                0
+            );
+
+            $this->assertEquals(
+                $provider->compare(
+                    $provider->add('5.731733759839529271053448625299468628', '-5.731733759839529271053448625299468627'),
+                    '0.000000000000000000000000000000000001'
+                ),
+                0
+            );
+        }
+    }
+
+    /**
+     * @dataProvider dataProvider
+     * @param string $class
+     * @return void
+     */
+    public function testSub(string $class): void
+    {
+        /**
+         * @var Mathable $provider
+         */
+        $provider = app($class);
+
+        // int
+        $this->assertEquals($provider->sub(1, 5), -4);
+        $this->assertEquals($provider->sub(-1, 5), -6);
+
+        // float
+        $this->assertEquals($provider->sub(1.17, 4.83), -3.66);
+        $this->assertEquals($provider->sub(-1.44, 5.43), -6.87);
+
+        if ($provider instanceof BCMath) {
+            $this->assertEquals(
+                $provider->compare(
+                    $provider->sub('4.331733759839529271053448625299468628', 1.4),
+                    '2.931733759839529271053448625299468628'
+                ),
+                0
+            );
+
+            $this->assertEquals(
+                $provider->compare(
+                    $provider->sub('5.731733759839529271053448625299468628', '5.731733759839529271053448625299468627'),
+                    '0.000000000000000000000000000000000001'
+                ),
+                0
+            );
+        }
+    }
+
+    /**
+     * @dataProvider dataProvider
+     * @param string $class
+     * @return void
+     */
+    public function testDiv(string $class): void
+    {
+        /**
+         * @var Mathable $provider
+         */
+        $provider = app($class);
+
+        // int
+        $this->assertEquals($provider->div(1, 5), 0.2);
+        $this->assertEquals($provider->div(-1, 5), -0.2);
+
+        // float
+        $this->assertEquals($provider->div(1.17, 4.83), 0.24223602484472);
+        $this->assertEquals($provider->div(-1.44, 5.43), -0.26519337016574);
+
+        if ($provider instanceof BCMath) {
+            $this->assertEquals(
+                $provider->compare(
+                    $provider->div('4.331733759839529271053448625299468628', 1.4),
+                    '3.0940955427425209078953204466424775914285714285714285714285714285'
+                ),
+                0
+            );
+
+            $this->assertEquals(
+                $provider->compare(
+                    $provider->div('5.731733759839529271053448625299468628', '5.731733759839529271053448625299468627'),
+                    '1.0000000000000000000000000000000000001744672802157504419105369811'
+                ),
+                0
+            );
+        }
+    }
+
+    /**
+     * @dataProvider dataProvider
+     * @param string $class
+     * @return void
+     */
+    public function testMul(string $class): void
+    {
+        /**
+         * @var Mathable $provider
+         */
+        $provider = app($class);
+
+        // int
+        $this->assertEquals($provider->mul(1, 5), 5);
+        $this->assertEquals($provider->mul(-1, 5), -5);
+
+        // float
+        $this->assertEquals($provider->mul(1.17, 4.83), 5.6511);
+        $this->assertEquals($provider->mul(-1.44, 5.43), -7.8192);
+
+        if ($provider instanceof BCMath) {
+            $this->assertEquals(
+                $provider->compare(
+                    $provider->mul('4.331733759839529271053448625299468628', 1.4),
+                    '6.0644272637753409794748280754192560792000000000000000000000000000'
+                ),
+                0
+            );
+
+            $this->assertEquals(
+                $provider->compare(
+                    $provider->mul('5.731733759839529271053448625299468628', '5.731733759839529271053448625299468627'),
+                    '32.8527718936841866108362353549577464458763784076112941028307058338'
+                ),
+                0
+            );
+        }
+    }
+
+    /**
+     * @dataProvider dataProvider
+     * @param string $class
+     * @return void
+     */
+    public function testPow(string $class): void
+    {
+        /**
+         * @var Mathable $provider
+         */
+        $provider = app($class);
+
+        // int
+        $this->assertEquals($provider->pow(1, 5), 1);
+        $this->assertEquals($provider->pow(-1, 5), -1);
+
+        // float
+        $this->assertEquals($provider->pow(1.17, 4), 1.87388721);
+        $this->assertEquals($provider->pow(-1.44, 5), -6.1917364224);
+
+        if ($provider instanceof BCMath) {
+            $this->assertEquals(
+                $provider->compare(
+                    $provider->pow('4.331733759839529271053448625299468628', 14),
+                    '818963567.1194514424328910747572247977826032927674623819207642247854744523'
+                ),
+                0
+            );
+
+            $this->assertEquals(
+                $provider->compare(
+                    $provider->pow('5.731733759839529271053448625299468628', 6),
+                    '35458.1485207464760293448564751702377579632773756221209731837301291644'
+                ),
+                0
+            );
+        }
+    }
+
+    /**
+     * @dataProvider dataProvider
+     * @param string $class
+     * @return void
+     */
+    public function testCeil(string $class): void
+    {
+        /**
+         * @var Mathable $provider
+         */
+        $provider = app($class);
+
+        // positive
+        // int
+        $this->assertEquals(
+            $provider->ceil(35458),
+            35458
+        );
+
+        // float
+        $this->assertEquals($provider->ceil('35458.00000000'), 35458);
+        $this->assertEquals(
+            $provider->ceil(35458.0000001),
+            35459
+        );
+        $this->assertEquals(
+            $provider->ceil(35458.4),
+            35459
+        );
+        $this->assertEquals(
+            $provider->ceil(35458.5),
+            35459
+        );
+        $this->assertEquals(
+            $provider->ceil(35458.6),
+            35459
+        );
+
+        // string
+        $this->assertEquals(
+            $provider->ceil('35458.1485207464760293448564751702377579632773756221209731837301291644'),
+            35459
+        );
+
+        // negative
+        // int
+        $this->assertEquals(
+            $provider->ceil(-35458),
+            -35458
+        );
+
+        // float
+        $this->assertEquals(
+            $provider->ceil(-35458.0000001),
+            -35458
+        );
+        $this->assertEquals(
+            $provider->ceil(-35458.4),
+            -35458
+        );
+        $this->assertEquals(
+            $provider->ceil(-35458.5),
+            -35458
+        );
+        $this->assertEquals(
+            $provider->ceil(-35458.6),
+            -35458
+        );
+
+        // string
+        $this->assertEquals(
+            $provider->ceil('-35458.1485207464760293448564751702377579632773756221209731837301291644'),
+            -35458
+        );
+    }
+
+    /**
+     * @dataProvider dataProvider
+     * @param string $class
+     * @return void
+     */
+    public function testFloor(string $class): void
+    {
+        /**
+         * @var Mathable $provider
+         */
+        $provider = app($class);
+
+        // positive
+        // int
+        $this->assertEquals(
+            $provider->floor(35458),
+            35458
+        );
+
+        // float
+        $this->assertEquals($provider->floor('35458.00000000'), 35458);
+        $this->assertEquals(
+            $provider->floor(35458.0000001),
+            35458
+        );
+        $this->assertEquals(
+            $provider->floor(35458.4),
+            35458
+        );
+        $this->assertEquals(
+            $provider->floor(35458.5),
+            35458
+        );
+        $this->assertEquals(
+            $provider->floor(35458.6),
+            35458
+        );
+
+        // string
+        $this->assertEquals(
+            $provider->floor('35458.1485207464760293448564751702377579632773756221209731837301291644'),
+            35458
+        );
+
+        // negative
+        // int
+        $this->assertEquals(
+            $provider->floor(-35458),
+            -35458
+        );
+
+        // float
+        $this->assertEquals(
+            $provider->floor(-35458.0000001),
+            -35459
+        );
+        $this->assertEquals(
+            $provider->floor(-35458.4),
+            -35459
+        );
+        $this->assertEquals(
+            $provider->floor(-35458.5),
+            -35459
+        );
+        $this->assertEquals(
+            $provider->floor(-35458.6),
+            -35459
+        );
+
+        // string
+        $this->assertEquals(
+            $provider->floor('-35458.1485207464760293448564751702377579632773756221209731837301291644'),
+            -35459
+        );
+    }
+
+    /**
+     * @dataProvider dataProvider
+     * @param string $class
+     * @return void
+     */
+    public function testRound(string $class): void
+    {
+        /**
+         * @var Mathable $provider
+         */
+        $provider = app($class);
+
+        // positive
+        // int
+        $this->assertEquals(
+            $provider->round(35458),
+            35458
+        );
+
+        // float
+        $this->assertEquals($provider->round('35458.00000000'), 35458);
+        $this->assertEquals(
+            $provider->round(35458.0000001),
+            35458
+        );
+        $this->assertEquals(
+            $provider->round(35458.4),
+            35458
+        );
+        $this->assertEquals(
+            $provider->round(35458.5),
+            35459
+        );
+        $this->assertEquals(
+            $provider->round(35458.6),
+            35459
+        );
+
+        // string
+        $this->assertEquals(
+            $provider->round('35458.1485207464760293448564751702377579632773756221209731837301291644'),
+            35458
+        );
+
+        // negative
+        // int
+        $this->assertEquals(
+            $provider->round(-35458),
+            -35458
+        );
+
+        // float
+        $this->assertEquals(
+            $provider->round(-35458.0000001),
+            -35458
+        );
+        $this->assertEquals(
+            $provider->round(-35458.4),
+            -35458
+        );
+        $this->assertEquals(
+            $provider->round(-35458.5),
+            -35459
+        );
+        $this->assertEquals(
+            $provider->round(-35458.6),
+            -35459
+        );
+
+        // string
+        $this->assertEquals(
+            $provider->round('-35458.1485207464760293448564751702377579632773756221209731837301291644'),
+            -35458
+        );
+    }
+
+    /**
+     * @return array
+     */
+    public function dataProvider(): array
+    {
+        $providers = [[Math::class]];
+
+        if (extension_loaded('bcmath')) {
+            $providers[] = [BCMath::class];
+        }
+
+        return $providers;
+    }
+
+}
diff --git a/tests/Models/Item.php b/tests/Models/Item.php
index 628d18218..3754ff9c3 100644
--- a/tests/Models/Item.php
+++ b/tests/Models/Item.php
@@ -46,9 +46,9 @@ public function canBuy(Customer $customer, int $quantity = 1, bool $force = null
 
     /**
      * @param Customer $customer
-     * @return int
+     * @return float|int
      */
-    public function getAmountProduct(Customer $customer): int
+    public function getAmountProduct(Customer $customer)
     {
         /**
          * @var Wallet $wallet
diff --git a/tests/Models/ItemDiscount.php b/tests/Models/ItemDiscount.php
index 9a8834c5d..96e91e98a 100644
--- a/tests/Models/ItemDiscount.php
+++ b/tests/Models/ItemDiscount.php
@@ -23,10 +23,9 @@ public function getTable(): string
      */
     public function getPersonalDiscount(Customer $customer): int
     {
-        $wallet = app(WalletService::class)
-            ->getWallet($customer);
-
-        return $wallet->holder->id;
+        return app(WalletService::class)
+            ->getWallet($customer)
+            ->holder_id;
     }
 
 }
diff --git a/tests/Models/ItemTax.php b/tests/Models/ItemTax.php
index 035ef4c1f..0cc687c11 100644
--- a/tests/Models/ItemTax.php
+++ b/tests/Models/ItemTax.php
@@ -23,9 +23,9 @@ public function getTable(): string
      * Minimum 0; Maximum 100
      * Example: return 7.5; // 7.5%
      *
-     * @return float
+     * @return int|float
      */
-    public function getFeePercent(): float
+    public function getFeePercent()
     {
         return 7.5;
     }
diff --git a/tests/ProxyTest.php b/tests/ProxyTest.php
deleted file mode 100644
index 055e7cb19..000000000
--- a/tests/ProxyTest.php
+++ /dev/null
@@ -1,25 +0,0 @@
-<?php
-
-namespace Bavix\Wallet\Test;
-
-use Bavix\Wallet\Services\ProxyService;
-use function app;
-
-class ProxyTest extends TestCase
-{
-
-    /**
-     * @return void
-     */
-    public function testSimple(): void
-    {
-        $proxy = app(ProxyService::class);
-        for ($i = 0; $i < 10; $i++) {
-            $proxy[$i] = $i;
-            $this->assertEquals($proxy[$i], $i);
-            $proxy->remove($i);
-            $this->assertEquals($proxy[$i], 0);
-        }
-    }
-
-}
diff --git a/tests/SingletonTest.php b/tests/SingletonTest.php
index 222941f3f..9f04dc52f 100644
--- a/tests/SingletonTest.php
+++ b/tests/SingletonTest.php
@@ -2,7 +2,9 @@
 
 namespace Bavix\Wallet\Test;
 
+use Bavix\Wallet\Interfaces\Mathable;
 use Bavix\Wallet\Interfaces\Rateable;
+use Bavix\Wallet\Interfaces\Storable;
 use Bavix\Wallet\Objects\Bring;
 use Bavix\Wallet\Objects\Cart;
 use Bavix\Wallet\Objects\EmptyLock;
@@ -11,7 +13,6 @@
 use Bavix\Wallet\Services\DbService;
 use Bavix\Wallet\Services\ExchangeService;
 use Bavix\Wallet\Services\LockService;
-use Bavix\Wallet\Services\ProxyService;
 use Bavix\Wallet\Services\WalletService;
 use Bavix\Wallet\Test\Common\Models\Transaction;
 use Bavix\Wallet\Test\Common\Models\Transfer;
@@ -69,6 +70,22 @@ public function testRateable(): void
         $this->assertEquals($this->getRefId(Rateable::class), $this->getRefId(Rateable::class));
     }
 
+    /**
+     * @return void
+     */
+    public function testStorable(): void
+    {
+        $this->assertEquals($this->getRefId(Storable::class), $this->getRefId(Storable::class));
+    }
+
+    /**
+     * @return void
+     */
+    public function testMathable(): void
+    {
+        $this->assertEquals($this->getRefId(Mathable::class), $this->getRefId(Mathable::class));
+    }
+
     /**
      * @return void
      */
@@ -109,14 +126,6 @@ public function testCommonService(): void
         $this->assertEquals($this->getRefId(CommonService::class), $this->getRefId(CommonService::class));
     }
 
-    /**
-     * @return void
-     */
-    public function testProxyService(): void
-    {
-        $this->assertEquals($this->getRefId(ProxyService::class), $this->getRefId(ProxyService::class));
-    }
-
     /**
      * @return void
      */
diff --git a/tests/TestCase.php b/tests/TestCase.php
index dd06c0570..aa6de7f01 100644
--- a/tests/TestCase.php
+++ b/tests/TestCase.php
@@ -2,7 +2,9 @@
 
 namespace Bavix\Wallet\Test;
 
-use Bavix\Wallet\Services\ProxyService;
+use Bavix\Wallet\Interfaces\Storable;
+use Bavix\Wallet\Simple\BCMath;
+use Bavix\Wallet\Simple\Math;
 use Bavix\Wallet\Simple\Store;
 use Bavix\Wallet\Test\Common\Models\Transaction;
 use Bavix\Wallet\Test\Common\Models\Transfer;
@@ -22,7 +24,6 @@ class TestCase extends OrchestraTestCase
      */
     public function setUp(): void
     {
-        app(ProxyService::class)->fresh();
         parent::setUp();
         $this->withFactories(__DIR__ . '/factories');
         $this->loadMigrationsFrom([
@@ -48,6 +49,7 @@ protected function getPackageProviders($app): array
         // Bind eloquent models to IoC container
         $app['config']->set('wallet.package.rateable', Rate::class);
         $app['config']->set('wallet.package.storable', Store::class);
+        $app['config']->set('wallet.package.mathable', extension_loaded('bcmath') ? BCMath::class : Math::class);
         return [WalletServiceProvider::class];
     }
 
diff --git a/tests/WalletFloatTest.php b/tests/WalletFloatTest.php
index 78a02d82b..952758628 100644
--- a/tests/WalletFloatTest.php
+++ b/tests/WalletFloatTest.php
@@ -4,8 +4,9 @@
 
 use Bavix\Wallet\Exceptions\AmountInvalid;
 use Bavix\Wallet\Exceptions\BalanceIsEmpty;
+use Bavix\Wallet\Interfaces\Mathable;
 use Bavix\Wallet\Models\Transaction;
-use Bavix\Wallet\Services\WalletService;
+use Bavix\Wallet\Simple\BCMath;
 use Bavix\Wallet\Test\Models\UserFloat as User;
 
 class WalletFloatTest extends TestCase
@@ -289,4 +290,61 @@ public function testMathRounding(): void
         $this->assertEquals($transaction->type, Transaction::TYPE_WITHDRAW);
     }
 
+    /**
+     * @return void
+     */
+    public function testEther(): void
+    {
+        if (app(Mathable::class) instanceof BCMath) {
+            /**
+             * @var User $user
+             */
+            $user = factory(User::class)->create();
+            $this->assertEquals($user->balance, 0);
+
+            $user->wallet->decimal_places = 18;
+            $user->wallet->save();
+
+            $math = app(Mathable::class);
+
+            $user->depositFloat('545.8754855274419');
+            $this->assertEquals($user->balance, '545875485527441900000');
+            $this->assertEquals($math->compare($user->balanceFloat, '545.8754855274419'), 0);
+        }
+    }
+
+    /**
+     * @return void
+     */
+    public function testBitcoin(): void
+    {
+        if (app(Mathable::class) instanceof BCMath) {
+            /**
+             * @var User $user
+             */
+            $user = factory(User::class)->create();
+            $this->assertEquals($user->balance, 0);
+
+            $user->wallet->decimal_places = 32; // bitcoin wallet
+            $user->wallet->save();
+
+            $math = app(Mathable::class);
+
+            for ($i = 0; $i < 256; $i++) {
+                $user->depositFloat('0.00000001'); // Satoshi
+            }
+
+            $this->assertEquals($user->balance, '256' . str_repeat('0', 32 - 8));
+            $this->assertEquals($math->compare($user->balanceFloat, '0.00000256'), 0);
+
+            $user->deposit(256 . str_repeat('0', 32));
+            $user->depositFloat('0.' . str_repeat('0', 31) . '1');
+
+            [$q, $r] = explode('.', $user->balanceFloat, 2);
+            $this->assertEquals(strlen($r), $user->wallet->decimal_places);
+            $this->assertEquals($user->balance, '25600000256000000000000000000000001');
+            $this->assertEquals($user->balanceFloat, '256.00000256000000000000000000000001');
+        }
+    }
+
 }