diff --git a/packages/wallet-service/src/fullnode.ts b/packages/wallet-service/src/fullnode.ts
index c71c01da..8a710a0c 100644
--- a/packages/wallet-service/src/fullnode.ts
+++ b/packages/wallet-service/src/fullnode.ts
@@ -32,7 +32,7 @@ export const create = (baseURL = BASE_URL) => {
       throw new Error(error.message);
     }
 
-    return value as FullNodeApiVersionResponse;
+    return value;
   };
 
   const downloadTx = async (txId: string) => {
diff --git a/packages/wallet-service/src/types.ts b/packages/wallet-service/src/types.ts
index b282e3cd..0fbd8218 100644
--- a/packages/wallet-service/src/types.ts
+++ b/packages/wallet-service/src/types.ts
@@ -126,7 +126,7 @@ export interface FullNodeApiVersionResponse {
   genesis_block_hash?: string,
   genesis_tx1_hash?: string,
   genesis_tx2_hash?: string,
-  native_token?: { name: string, symbol: string };
+  native_token?: { name: string, symbol: string, version?: number };
 }
 
 export interface TxProposal {
diff --git a/packages/wallet-service/tests/fullnode.test.ts b/packages/wallet-service/tests/fullnode.test.ts
index 4fc3a02c..f60e3b33 100644
--- a/packages/wallet-service/tests/fullnode.test.ts
+++ b/packages/wallet-service/tests/fullnode.test.ts
@@ -1,4 +1,60 @@
 import fullnode from '@src/fullnode';
+import { defaultTestVersionData } from '@tests/utils';
+
+describe('version', () => {
+  afterEach(() => {
+    jest.restoreAllMocks();
+  });
+
+  test('returns parsed payload when native_token includes the version field', async () => {
+    expect.hasAssertions();
+
+    const payload = {
+      ...defaultTestVersionData(),
+      native_token: { name: 'Hathor', symbol: 'HTR', version: 0 },
+    };
+    const apiGetSpy = jest.spyOn(fullnode.api, 'get');
+    apiGetSpy.mockImplementation(() => Promise.resolve({
+      status: 200,
+      data: payload,
+    }));
+
+    const response = await fullnode.version();
+    expect(response).toStrictEqual(payload);
+  });
+
+  test('returns parsed payload when native_token omits the version field', async () => {
+    expect.hasAssertions();
+
+    // defaultTestVersionData() returns a payload whose native_token has no `version`.
+    const payload = defaultTestVersionData();
+    const apiGetSpy = jest.spyOn(fullnode.api, 'get');
+    apiGetSpy.mockImplementation(() => Promise.resolve({
+      status: 200,
+      data: payload,
+    }));
+
+    const response = await fullnode.version();
+    expect(response).toStrictEqual(payload);
+    expect(response.native_token).not.toHaveProperty('version');
+  });
+
+  test('throws when the response fails schema validation', async () => {
+    expect.hasAssertions();
+
+    const invalidPayload = {
+      ...defaultTestVersionData(),
+      native_token: { name: 'Hathor', symbol: 'HTR', version: 1.5 },
+    };
+    const apiGetSpy = jest.spyOn(fullnode.api, 'get');
+    apiGetSpy.mockImplementation(() => Promise.resolve({
+      status: 200,
+      data: invalidPayload,
+    }));
+
+    await expect(fullnode.version()).rejects.toThrow(/native_token\.version/);
+  });
+});
 
 test('downloadTx', async () => {
   expect.hasAssertions();
diff --git a/packages/wallet-service/tests/schemas.test.ts b/packages/wallet-service/tests/schemas.test.ts
new file mode 100644
index 00000000..f491e77e
--- /dev/null
+++ b/packages/wallet-service/tests/schemas.test.ts
@@ -0,0 +1,43 @@
+import { FullnodeVersionSchema } from '@src/schemas';
+import { defaultTestVersionData } from '@tests/utils';
+
+// Regression guard: the `native_token.version` is not available in all live fullnode instances.
+// The Wallet Service must be able to handle both cases.
+test('FullnodeVersionSchema regression: native_token.version is accepted', () => {
+  const payload = {
+    ...defaultTestVersionData(),
+    native_token: { name: 'Hathor', symbol: 'HTR', version: 0 },
+  };
+  const { error, value } = FullnodeVersionSchema.validate(payload);
+  expect(error).toBeUndefined();
+  expect(value.native_token).toEqual({ name: 'Hathor', symbol: 'HTR', version: 0 });
+});
+
+test('FullnodeVersionSchema accepts a legacy fullnode payload without native_token.version', () => {
+  // defaultTestVersionData() returns a payload whose native_token has no `version`.
+  const { error } = FullnodeVersionSchema.validate(defaultTestVersionData());
+  expect(error).toBeUndefined();
+});
+
+// Design-intent guard: native_token is intentionally strict — any unknown
+// field there fails validation so a contract test (and not a production
+// outage) surfaces fullnode schema drift.
+test('FullnodeVersionSchema rejects unknown fields under native_token', () => {
+  const payload = {
+    ...defaultTestVersionData(),
+    native_token: { name: 'Hathor', symbol: 'HTR', version: 0, icon: 'data:image/png;base64,...' },
+  };
+  const { error } = FullnodeVersionSchema.validate(payload);
+  expect(error).toBeDefined();
+  expect(error!.message).toMatch(/native_token\.icon/);
+});
+
+test('FullnodeVersionSchema rejects a non-integer native_token.version', () => {
+  const payload = {
+    ...defaultTestVersionData(),
+    native_token: { name: 'Hathor', symbol: 'HTR', version: 1.5 },
+  };
+  const { error } = FullnodeVersionSchema.validate(payload);
+  expect(error).toBeDefined();
+  expect(error!.message).toMatch(/native_token\.version/);
+});