diff --git a/Project_Timer.xcodeproj/project.pbxproj b/Project_Timer.xcodeproj/project.pbxproj
index ff4f87b0..180532a8 100644
--- a/Project_Timer.xcodeproj/project.pbxproj
+++ b/Project_Timer.xcodeproj/project.pbxproj
@@ -204,6 +204,7 @@
 		8761BDC82BCFE64000E9281A /* RxMoya in Frameworks */ = {isa = PBXBuildFile; productRef = 8761BDC72BCFE64000E9281A /* RxMoya */; };
 		8761BDCA2BCFEA7A00E9281A /* AuthAPI.swift in Sources */ = {isa = PBXBuildFile; fileRef = 8761BDC92BCFEA7A00E9281A /* AuthAPI.swift */; };
 		8761BDCC2BCFEC8500E9281A /* DailysAPI.swift in Sources */ = {isa = PBXBuildFile; fileRef = 8761BDCB2BCFEC8500E9281A /* DailysAPI.swift */; };
+		8761BDCE2BCFEFD500E9281A /* API.swift in Sources */ = {isa = PBXBuildFile; fileRef = 8761BDCD2BCFEFD500E9281A /* API.swift */; };
 		8765234628C76B6D00487BFB /* WeekSmallTime.swift in Sources */ = {isa = PBXBuildFile; fileRef = 8765234528C76B6D00487BFB /* WeekSmallTime.swift */; };
 		8765234828C76FFE00487BFB /* WeekSmallVM.swift in Sources */ = {isa = PBXBuildFile; fileRef = 8765234728C76FFE00487BFB /* WeekSmallVM.swift */; };
 		8765234A28C7709700487BFB /* WeekSmallView.swift in Sources */ = {isa = PBXBuildFile; fileRef = 8765234928C7709700487BFB /* WeekSmallView.swift */; };
@@ -627,6 +628,7 @@
 		8761BDBF2BCFE52E00E9281A /* FirebaseAPI.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = FirebaseAPI.swift; sourceTree = "<group>"; };
 		8761BDC92BCFEA7A00E9281A /* AuthAPI.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AuthAPI.swift; sourceTree = "<group>"; };
 		8761BDCB2BCFEC8500E9281A /* DailysAPI.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = DailysAPI.swift; sourceTree = "<group>"; };
+		8761BDCD2BCFEFD500E9281A /* API.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = API.swift; sourceTree = "<group>"; };
 		8765234528C76B6D00487BFB /* WeekSmallTime.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = WeekSmallTime.swift; sourceTree = "<group>"; };
 		8765234728C76FFE00487BFB /* WeekSmallVM.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = WeekSmallVM.swift; sourceTree = "<group>"; };
 		8765234928C7709700487BFB /* WeekSmallView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = WeekSmallView.swift; sourceTree = "<group>"; };
@@ -1169,6 +1171,7 @@
 				8761BDBF2BCFE52E00E9281A /* FirebaseAPI.swift */,
 				8761BDC92BCFEA7A00E9281A /* AuthAPI.swift */,
 				8761BDCB2BCFEC8500E9281A /* DailysAPI.swift */,
+				8761BDCD2BCFEFD500E9281A /* API.swift */,
 			);
 			path = API;
 			sourceTree = "<group>";
@@ -2392,6 +2395,7 @@
 				87A4704826493D4D007B89D6 /* RecordTimes.swift in Sources */,
 				87A8CD252AF0C37200D4C1D7 /* TTSignupSecureFieldView.swift in Sources */,
 				872C0EE3284AF26A00E8E3F2 /* SettingUpdateHistoryVM.swift in Sources */,
+				8761BDCE2BCFEFD500E9281A /* API.swift in Sources */,
 				87EFD6832AC12C3800C422B1 /* SigninSignupEnvironment.swift in Sources */,
 				93A892B124C14D4700F89180 /* CircularProgressView.swift in Sources */,
 				8791C1F427DCD120000D6BA9 /* UserDefaultsManager.swift in Sources */,
diff --git a/Project_Timer/Data/API/API.swift b/Project_Timer/Data/API/API.swift
new file mode 100644
index 00000000..2a6cf5d1
--- /dev/null
+++ b/Project_Timer/Data/API/API.swift
@@ -0,0 +1,22 @@
+//
+//  API.swift
+//  Project_Timer
+//
+//  Created by Kang Minsang on 2024/04/17.
+//  Copyright © 2024 FDEE. All rights reserved.
+//
+
+import Foundation
+import Moya
+
+extension TargetType {
+    func parameters(from encodable: Encodable) -> [String: Any] {
+        let encoder = JSONEncoder()
+        guard let data = try? encoder.encode(encodable),
+              let dictionary = try? JSONSerialization.jsonObject(with: data, options: .allowFragments) as? [String: Any] else {
+            return [:]
+        }
+        
+        return dictionary
+    }
+}
diff --git a/Project_Timer/Data/API/AuthAPI.swift b/Project_Timer/Data/API/AuthAPI.swift
index 4b221679..65d928c8 100644
--- a/Project_Timer/Data/API/AuthAPI.swift
+++ b/Project_Timer/Data/API/AuthAPI.swift
@@ -10,11 +10,11 @@ import Foundation
 import Moya
 
 enum AuthAPI {
-    case postSignup
-    case postSignin
-    case getCheckUsername
-    case getCheckEmail
-    case postUpdatePassword
+    case postSignup(TestUserSignupInfo)
+    case postSignin(TestUserSigninInfo)
+    case getCheckUsername(String)
+    case getCheckEmail(String, String)
+    case postUpdatePassword(ResetPasswordRequest)
 }
 
 extension AuthAPI: TargetType {
@@ -45,10 +45,27 @@ extension AuthAPI: TargetType {
     }
     
     var task: Moya.Task {
-        return .requestPlain
+        switch self {
+        case .postSignup(let testUserSignupInfo):
+            return .requestJSONEncodable(testUserSignupInfo)
+        case .postSignin(let testUserSignupInfo):
+            return .requestJSONEncodable(testUserSignupInfo)
+        case .getCheckUsername(let username):
+            return .requestParameters(parameters: [
+                "username" : username
+            ], encoding: URLEncoding.queryString)
+        case .getCheckEmail(let username, let email):
+            return .requestParameters(parameters: [
+                "username": username,
+                "email": email
+            ], encoding: URLEncoding.queryString)
+        case .postUpdatePassword(let resetPasswordRequest):
+            return .requestJSONEncodable(resetPasswordRequest)
+        }
     }
     
-    var headers: [String : String]? {
+    var headers: [String: String]? {
         return nil
     }
 }
+