diff --git a/test/unit/acpFare.test.ts b/test/unit/acpFare.test.ts
new file mode 100644
index 0000000..59c58f6
--- /dev/null
+++ b/test/unit/acpFare.test.ts
@@ -0,0 +1,290 @@
+jest.mock("../../src/configs/acpConfigs", () => ({
+  baseAcpConfig: {
+    baseFare: {
+      contractAddress: "0xMockedBaseFare",
+      decimals: 18,
+    },
+  },
+  AcpContractConfig: {},
+}));
+
+jest.mock("viem", () => ({
+  ...jest.requireActual("viem"),
+  createPublicClient: jest.fn(),
+}));
+
+import { Address, createPublicClient } from "viem";
+import {
+  Fare,
+  FareAmount,
+  FareBigInt,
+  FareAmountBase,
+  wethFare,
+  ethFare,
+} from "../../src/acpFare";
+import AcpError from "../../src/acpError";
+
+describe("AcpFare Unit Testing", () => {
+  // Create mock config to avoid circular dependency
+  const mockBaseAcpConfig = {
+    baseFare: new Fare("0xBaseFare" as Address, 18),
+    chain: { id: 8453 },
+    rpcUrl: "https://test.rpc",
+  };
+
+  describe("Fare Class", () => {
+    describe("Constructor", () => {
+      it("should initialize with correct parameters", () => {
+        const fare = new Fare("0x1234" as Address, 18);
+
+        expect(fare.contractAddress).toBe("0x1234");
+        expect(fare.decimals).toBe(18);
+      });
+    });
+
+    describe("formatAmount", () => {
+      it("should format amount with 18 decimals", () => {
+        const fare = new Fare("0x1234" as Address, 18);
+        const result = fare.formatAmount(1);
+
+        expect(result).toBe(1000000000000000000n); // 1 * 10^18
+      });
+
+      it("should format amount with 6 decimals", () => {
+        const fare = new Fare("0x1234" as Address, 6);
+        const result = fare.formatAmount(1);
+
+        expect(result).toBe(1000000n); // 1 * 10^6
+      });
+
+      it("should format decimal amounts", () => {
+        const fare = new Fare("0x1234" as Address, 18);
+        const result = fare.formatAmount(1.5);
+
+        expect(result).toBe(1500000000000000000n); // 1.5 * 10^18
+      });
+    });
+
+    describe("fromContractAddress", () => {
+      it("should return baseFare when address matches config", async () => {
+        const result = await Fare.fromContractAddress(
+          mockBaseAcpConfig.baseFare.contractAddress,
+          mockBaseAcpConfig as any,
+        );
+        expect(result).toBe(mockBaseAcpConfig.baseFare);
+      });
+
+      it("should create new Fare by reading decimals from contract", async () => {
+        const mockAddress = "0xCustomAddress" as Address;
+
+        const mockDecimals = 6;
+
+        const mockReadContract = jest.fn().mockResolvedValue(mockDecimals);
+        (createPublicClient as jest.Mock).mockReturnValue({
+          readContract: mockReadContract,
+        });
+
+        const result = await Fare.fromContractAddress(
+          mockAddress,
+          mockBaseAcpConfig as any,
+        );
+
+        expect(result).toBeInstanceOf(Fare);
+        expect(result.contractAddress).toBe(mockAddress);
+        expect(result.decimals).toBe(mockDecimals);
+        expect(mockReadContract).toHaveBeenCalledWith({
+          address: mockAddress,
+          abi: expect.any(Array),
+          functionName: "decimals",
+        });
+      });
+    });
+  });
+
+  describe("FareAmount Class", () => {
+    let fare: Fare;
+
+    beforeEach(() => {
+      fare = new Fare("0xToken" as Address, 18);
+    });
+
+    describe("Constructor", () => {
+      it("should create FareAmount with whole number", () => {
+        const fareAmount = new FareAmount(100, fare);
+
+        expect(fareAmount.amount).toBe(100000000000000000000n);
+        expect(fareAmount.fare).toBe(fare);
+      });
+
+      it("should truncate to 6 decimals", () => {
+        const fareAmount = new FareAmount(1.123456789, fare);
+
+        expect(fareAmount.amount).toBe(1123456000000000000n);
+      });
+
+      it("should handle numbers with less than 6 decimals", () => {
+        const fareAmount = new FareAmount(5, fare);
+
+        expect(fareAmount.amount).toBe(5000000000000000000n);
+      });
+
+      it("should handle numbers without decimals", () => {
+        const fareAmount = new FareAmount(5, fare);
+
+        expect(fareAmount.amount).toBe(5000000000000000000n);
+      });
+    });
+
+    describe("add", () => {
+      it("should add two FareAmounts with same token", () => {
+        const fareAmount1 = new FareAmount(10, fare);
+        const fareAmount2 = new FareAmount(5, fare);
+
+        const result = fareAmount1.add(fareAmount2);
+
+        expect(result.fare).toBe(fare);
+      });
+
+      it("should throw error when adding FareAmounts with different tokens", () => {
+        const fare1 = new Fare("0xToken1" as Address, 18);
+        const fare2 = new Fare("0xToken2" as Address, 18);
+
+        const fareAmount1 = new FareAmount(10, fare1);
+        const fareAmount2 = new FareAmount(5, fare2);
+
+        expect(() => fareAmount1.add(fareAmount2)).toThrow(
+          "Token addresses do not match",
+        );
+      });
+
+      it("should add FareAmount with FareBigInt", () => {
+        const fareAmount = new FareAmount(10, fare);
+        const fareBigInt = new FareBigInt(5000000000000000000n, fare);
+
+        const result = fareAmount.add(fareBigInt);
+
+        expect(result).toBeInstanceOf(FareBigInt);
+        expect(result.amount).toBe(15000000000000000000n);
+      });
+    });
+  });
+
+  describe("FareBigInt Class", () => {
+    let fare: Fare;
+
+    beforeEach(() => {
+      fare = new Fare("0xToken" as Address, 18);
+    });
+
+    describe("Constructor", () => {
+      it("should create FareBigInt with bigint amount", () => {
+        const fareBigInt = new FareBigInt(1000000000000000000n, fare);
+
+        expect(fareBigInt.amount).toBe(1000000000000000000n);
+
+        expect(fareBigInt.fare).toBe(fare);
+      });
+    });
+
+    describe("add", () => {
+      it("should add two FareBigInts with same token", () => {
+        const fareBigInt1 = new FareBigInt(10000000000000000000n, fare);
+        const fareBigInt2 = new FareBigInt(5000000000000000000n, fare);
+
+        const result = fareBigInt1.add(fareBigInt2);
+
+        expect(result).toBeInstanceOf(FareBigInt);
+        expect(result.amount).toBe(15000000000000000000n);
+        expect(result.fare).toBe(fare);
+      });
+
+      it("should throw AcpError when adding FareBigInts with different tokens", () => {
+        const fare1 = new Fare("0xToken1" as Address, 18);
+        const fare2 = new Fare("0xToken2" as Address, 18);
+        const fareBigInt1 = new FareBigInt(10000000000000000000n, fare1);
+        const fareBigInt2 = new FareBigInt(5000000000000000000n, fare2);
+
+        expect(() => fareBigInt1.add(fareBigInt2)).toThrow(AcpError);
+        expect(() => fareBigInt1.add(fareBigInt2)).toThrow(
+          "Token addresses do not match",
+        );
+      });
+
+      it("should add FareBigInt with FareAmount", () => {
+        const fareBigInt = new FareBigInt(10000000000000000000n, fare);
+        const fareAmount = new FareAmount(5, fare);
+        const result = fareBigInt.add(fareAmount);
+
+        expect(result).toBeInstanceOf(FareBigInt);
+        expect(result.amount).toBe(15000000000000000000n);
+      });
+    });
+  });
+
+  describe("FareAmountBase Class", () => {
+    describe("fromContractAddress", () => {
+      it("should create FareAmount when amount is number", async () => {
+        const mockAddress = "0xToken" as Address;
+        const mockDecimals = 18;
+
+        const mockReadContract = jest.fn().mockResolvedValue(mockDecimals);
+        (createPublicClient as jest.Mock).mockReturnValue({
+          readContract: mockReadContract,
+        });
+
+        const result = await FareAmountBase.fromContractAddress(
+          100,
+          mockAddress,
+          mockBaseAcpConfig,
+        );
+
+        expect(result).toBeInstanceOf(FareAmount);
+        expect(result.amount).toBe(100000000000000000000n);
+      });
+
+      it("should create FareBigInt when amount is bigint", async () => {
+        const mockAddress = "0xToken" as Address;
+        const mockDecimals = 18;
+
+        const mockReadContract = jest.fn().mockResolvedValue(mockDecimals);
+        (createPublicClient as jest.Mock).mockReturnValue({
+          readContract: mockReadContract,
+        });
+
+        const result = await FareAmountBase.fromContractAddress(
+          100000000000000000000n,
+          mockAddress,
+          mockBaseAcpConfig,
+        );
+
+        expect(result).toBeInstanceOf(FareBigInt);
+        expect(result.amount).toBe(100000000000000000000n);
+      });
+
+      it("should use baseFare when address matches config", async () => {
+        const result = await FareAmountBase.fromContractAddress(
+          10,
+          mockBaseAcpConfig.baseFare.contractAddress,
+          mockBaseAcpConfig,
+        );
+
+        expect(result.fare).toBe(mockBaseAcpConfig.baseFare);
+      });
+    });
+  });
+
+  describe("Exported Constants", () => {
+    it("should export wethFare with correct address and decimals", () => {
+      expect(wethFare).toBeInstanceOf(Fare);
+      expect(wethFare.contractAddress).toBe(
+        "0x4200000000000000000000000000000000000006",
+      );
+      expect(wethFare.decimals).toBe(18);
+    });
+
+    it("should export ethFare with correct address and decimals", () => {
+      expect(ethFare).toBeInstanceOf(Fare);
+      expect(ethFare.decimals).toBe(18);
+    });
+  });
+});