diff --git a/src/application/use-cases/add-money-to-wallet.spec.ts b/src/application/use-cases/add-money-to-wallet.spec.ts
new file mode 100644
index 0000000..f91c31b
--- /dev/null
+++ b/src/application/use-cases/add-money-to-wallet.spec.ts
@@ -0,0 +1,62 @@
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
+
+import { ResourceNotFoundError } from "@/application/errors/resource-not-found";
+import { AddMoneyToWalletUseCase } from "@/application/use-cases/add-money-to-wallet";
+import { Currencies } from "@/domain/entities/wallet";
+import { InMemoryWalletRepository } from "@/infra/repositories/in-memory/in-memory-wallet-repository";
+
+describe("Use Case -> Add Money To Wallet Use Case", () => {
+  let sut: AddMoneyToWalletUseCase;
+  let walletId: string;
+
+  beforeEach(async () => {
+    const walletRepository = new InMemoryWalletRepository();
+    sut = new AddMoneyToWalletUseCase(walletRepository);
+
+    const { id } = await walletRepository.create({
+      currency: Currencies.BRL,
+      userId: "user_id",
+    });
+
+    walletId = id;
+  });
+
+  afterEach(() => {
+    vi.resetAllMocks();
+  });
+
+  it("should be able to add money into the wallet", async () => {
+    const spy = vi.spyOn(sut, "execute");
+    const amount = 763.13;
+
+    await sut.execute({
+      amount,
+      walletId,
+    });
+
+    expect(spy).toHaveBeenCalledOnce();
+  });
+
+  it("should throw an error if amount is less or equal than 0", async () => {
+    const amount = -763.13;
+
+    await expect(
+      sut.execute({
+        amount,
+        walletId,
+      }),
+    ).rejects.toThrow("Invalid operation");
+  });
+
+  it("should throw an error if wallet doesn't exits", async () => {
+    const amount = 763.13;
+    const walletId = "non_existent";
+
+    await expect(
+      sut.execute({
+        amount,
+        walletId,
+      }),
+    ).rejects.toThrow(ResourceNotFoundError);
+  });
+});
diff --git a/src/application/use-cases/add-money-to-wallet.ts b/src/application/use-cases/add-money-to-wallet.ts
index 5615ebb..54e80c9 100644
--- a/src/application/use-cases/add-money-to-wallet.ts
+++ b/src/application/use-cases/add-money-to-wallet.ts
@@ -2,32 +2,19 @@ import type { UseCase } from "@/domain/interfaces/use-case";
 import type { IWalletRepository } from "@/domain/repositories/wallet-repository";
 import { addBalance } from "@/utils/balance-helper";
 import { ResourceNotFoundError } from "../errors/resource-not-found";
-import type { ValidateUserExists } from "./validate-user-exists";
 
 interface AddMoneyToWalletInput {
   amount: number;
-  userId: string;
+  walletId: string;
 }
 
 export class AddMoneyToWalletUseCase
   implements UseCase<AddMoneyToWalletInput, void>
 {
-  constructor(
-    private readonly walletRepository: IWalletRepository,
-    private readonly validateUserExists: ValidateUserExists,
-  ) {}
+  constructor(private readonly walletRepository: IWalletRepository) {}
 
   async execute(input: AddMoneyToWalletInput): Promise<void> {
-    const userExists = await this.validateUserExists.execute({
-      field: "id",
-      value: input.userId,
-    });
-
-    if (!userExists) {
-      throw new ResourceNotFoundError("User");
-    }
-
-    const wallet = await this.walletRepository.findByUserId(input.userId);
+    const wallet = await this.walletRepository.findById(input.walletId);
 
     if (!wallet) {
       throw new ResourceNotFoundError("Wallet");