FUND ME PROJECT USING FOUNDRY

Deploy Contracts

Deploy Contracts on Localhost (Anvil)

1. Run foundry local node on a saperate terminal using anvil command.
2. Create a .env file and specify these environment variables inside it.

# anvil
# This is a RPC_URl of local node (Anvil) provided by foundry.
ANVIL_RPC_URL=http://127.0.0.1:8545
# This is a private key of the first account.
ANVIL_PRIVATE_KEY=0xac0974bec39a17e36ba4a6b4d238ff944bacb478cbed5efcae784d7bf4f2ff80

3. Create an alias for the ANVIL_RPC_URL inside the foundry.toml file. This will help us later in the command. Make sure to add [rpc_endpoints] above it.

[rpc_endpoints]
anvil = "${ANVIL_RPC_URL}"

4. Compile the contracts using forge build command (fix any issues you face).
5. Load the .env file variables using the command source .env
6. FundMe contract require the price-feed address in the constructor parameter, so for the local development we need to deploy the mocks to get the price-feed address. Deploy the mocks using command;

forge create MockV3Aggregator --rpc-url anvil --private-key $ANVIL_PRIVATE_KEY

7. Now we can deploy the FundMe contract and pass the address of mock contract (you can copy the address from terminal);

forge create FundMe --constructor-args <address-of-mock-contract> --rpc-url anvil --private-key $ANVIL_PRIVATE_KEY

Note: We only have 1 smart contract due to that we only specify the name of it (FundMe) in the command but incase you have multiple contract inside the same file or in different files then you need to specify the full path of smart contract i.e in our case src/FundMe.sol:FundMe

Deploy Contracts on Testnet (Sepolia)

1. Specify the SEPOLIA_RPC_URL, PRIVATE_KEY and ETHERSCAN_API_KEY inside the .env file.

SEPOLIA_RPC_URL=https://eth-sepolia.g.alchemy.com/v2/...
PRIVATE_KEY=...
ETHERSCAN_API_KEY=...

2. Add the alias for the SEPOLIA_RPC_URL below [rpc_endpoints].

[rpc_endpoints]
sepolia = "${SEPOLIA_RPC_URL}"

3. In order to verify the smart contract on etherscan you will need to add etherscan api key inside .env file and add this configuration inside foundry.toml file so the command can detect the network automatically.

[etherscan]
sepolia = {key = "${ETHERSCAN_API_KEY}"}

You can read more about configurations here https://github.com/foundry-rs/foundry/tree/master/config

5. FundMe contract require the price-feed address in the constructor parameter, Chainlink's ETH/USD price-feed address is 0x694AA1769357215DE4FAC081bf1f309aDC325306. Deploy the contract and pass the constructor arguments using command;

forge create FundMe --constructor-args 0x694AA1769357215DE4FAC081bf1f309aDC325306 --rpc-url sepolia --private-key $PRIVATE_KEY --verify