diff --git a/packages/wallet-service/serverless.yml b/packages/wallet-service/serverless.yml
index 579c7413..6106d3eb 100644
--- a/packages/wallet-service/serverless.yml
+++ b/packages/wallet-service/serverless.yml
@@ -352,6 +352,17 @@ functions:
     warmup:
       walletWarmer:
         enabled: true
+  hasTxOutsideFirstAddr:
+    handler: src/api/hasTxOutsideFirstAddr.get
+    events:
+      - http:
+          path: wallet/addresses/has-transactions-outside-first-address
+          method: get
+          cors: true
+          authorizer: ${self:custom.authorizer.walletBearer}
+    warmup:
+      walletWarmer:
+        enabled: false
   getUtxos:
     handler: src/api/txOutputs.getFilteredUtxos
     events:
diff --git a/packages/wallet-service/src/api/hasTxOutsideFirstAddr.ts b/packages/wallet-service/src/api/hasTxOutsideFirstAddr.ts
new file mode 100644
index 00000000..fd5a0944
--- /dev/null
+++ b/packages/wallet-service/src/api/hasTxOutsideFirstAddr.ts
@@ -0,0 +1,55 @@
+/**
+ * Copyright (c) Hathor Labs and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+import 'source-map-support/register';
+
+import { ApiError } from '@src/api/errors';
+import { closeDbAndGetError, warmupMiddleware } from '@src/api/utils';
+import {
+  getWallet,
+  hasTransactionsOnNonFirstAddress,
+} from '@src/db';
+import {
+  closeDbConnection,
+  getDbConnection,
+} from '@src/utils';
+import { walletIdProxyHandler } from '@src/commons';
+import middy from '@middy/core';
+import cors from '@middy/http-cors';
+import errorHandler from '@src/api/middlewares/errorHandler';
+
+const mysql = getDbConnection();
+
+/*
+ * Check if the wallet has any transactions on addresses with index > 0
+ *
+ * This lambda is called by API Gateway on GET /wallet/addresses/has-transactions-outside-first-address
+ */
+export const get = middy(walletIdProxyHandler(async (walletId) => {
+  const status = await getWallet(mysql, walletId);
+
+  if (!status) {
+    return closeDbAndGetError(mysql, ApiError.WALLET_NOT_FOUND);
+  }
+  if (!status.readyAt) {
+    return closeDbAndGetError(mysql, ApiError.WALLET_NOT_READY);
+  }
+
+  const hasTransactions = await hasTransactionsOnNonFirstAddress(mysql, walletId);
+
+  await closeDbConnection(mysql);
+
+  return {
+    statusCode: 200,
+    body: JSON.stringify({
+      success: true,
+      hasTransactions,
+    }),
+  };
+})).use(cors())
+  .use(warmupMiddleware())
+  .use(errorHandler());
diff --git a/packages/wallet-service/src/db/index.ts b/packages/wallet-service/src/db/index.ts
index 8a1d7207..08a5eec1 100644
--- a/packages/wallet-service/src/db/index.ts
+++ b/packages/wallet-service/src/db/index.ts
@@ -3205,3 +3205,28 @@ export const getAddressAtIndex = async (
     seqnum: addresses[0].seqnum,
   }
 };
+
+/**
+ * Check if a wallet has any transactions on addresses with index > 0
+ *
+ * @param mysql - Database connection
+ * @param walletId - The wallet id to search for
+ *
+ * @returns True if there are transactions on addresses with index > 0, false otherwise
+ */
+export const hasTransactionsOnNonFirstAddress = async (
+  mysql: ServerlessMysql,
+  walletId: string,
+): Promise<boolean> => {
+  const results: DbSelectResult = await mysql.query(
+    `SELECT 1
+       FROM \`address\`
+      WHERE \`wallet_id\` = ?
+        AND \`index\` > 0
+        AND \`transactions\` > 0
+      LIMIT 1`,
+    [walletId],
+  );
+
+  return results.length > 0;
+};
diff --git a/packages/wallet-service/tests/db.test.ts b/packages/wallet-service/tests/db.test.ts
index 28b59798..8baa7434 100644
--- a/packages/wallet-service/tests/db.test.ts
+++ b/packages/wallet-service/tests/db.test.ts
@@ -3802,3 +3802,81 @@ describe('markUtxosWithProposalId - improved query performance', () => {
     expect(markedUtxos[0].txProposalIndex).toBe(0);
   });
 });
+
+describe('hasTransactionsOnNonFirstAddress', () => {
+  it('should return false when wallet has no addresses', async () => {
+    expect.hasAssertions();
+
+    const walletId = 'test-wallet';
+    await createWallet(mysql, walletId, XPUBKEY, AUTH_XPUBKEY, 5);
+
+    const result = await Db.hasTransactionsOnNonFirstAddress(mysql, walletId);
+
+    expect(result).toBe(false);
+  });
+
+  it('should return false when wallet only has address at index 0', async () => {
+    expect.hasAssertions();
+
+    const walletId = 'test-wallet';
+    await createWallet(mysql, walletId, XPUBKEY, AUTH_XPUBKEY, 5);
+    await addToAddressTable(mysql, [
+      { address: ADDRESSES[0], index: 0, walletId, transactions: 5 },
+    ]);
+
+    const result = await Db.hasTransactionsOnNonFirstAddress(mysql, walletId);
+
+    expect(result).toBe(false);
+  });
+
+  it('should return false when non-first addresses have no transactions', async () => {
+    expect.hasAssertions();
+
+    const walletId = 'test-wallet';
+    await createWallet(mysql, walletId, XPUBKEY, AUTH_XPUBKEY, 5);
+    await addToAddressTable(mysql, [
+      { address: ADDRESSES[0], index: 0, walletId, transactions: 5 },
+      { address: ADDRESSES[1], index: 1, walletId, transactions: 0 },
+      { address: ADDRESSES[2], index: 2, walletId, transactions: 0 },
+    ]);
+
+    const result = await Db.hasTransactionsOnNonFirstAddress(mysql, walletId);
+
+    expect(result).toBe(false);
+  });
+
+  it('should return true when an address with index > 0 has transactions', async () => {
+    expect.hasAssertions();
+
+    const walletId = 'test-wallet';
+    await createWallet(mysql, walletId, XPUBKEY, AUTH_XPUBKEY, 5);
+    await addToAddressTable(mysql, [
+      { address: ADDRESSES[0], index: 0, walletId, transactions: 5 },
+      { address: ADDRESSES[1], index: 1, walletId, transactions: 3 },
+    ]);
+
+    const result = await Db.hasTransactionsOnNonFirstAddress(mysql, walletId);
+
+    expect(result).toBe(true);
+  });
+
+  it('should only consider addresses belonging to the specified wallet', async () => {
+    expect.hasAssertions();
+
+    const walletId1 = 'wallet-1';
+    const walletId2 = 'wallet-2';
+    await createWallet(mysql, walletId1, XPUBKEY, AUTH_XPUBKEY, 5);
+    await createWallet(mysql, walletId2, XPUBKEY, AUTH_XPUBKEY, 5);
+
+    await addToAddressTable(mysql, [
+      { address: ADDRESSES[0], index: 0, walletId: walletId1, transactions: 5 },
+      { address: ADDRESSES[1], index: 1, walletId: walletId2, transactions: 10 },
+    ]);
+
+    const result1 = await Db.hasTransactionsOnNonFirstAddress(mysql, walletId1);
+    const result2 = await Db.hasTransactionsOnNonFirstAddress(mysql, walletId2);
+
+    expect(result1).toBe(false);
+    expect(result2).toBe(true);
+  });
+});
diff --git a/packages/wallet-service/tests/hasTxOutsideFirstAddr.test.ts b/packages/wallet-service/tests/hasTxOutsideFirstAddr.test.ts
new file mode 100644
index 00000000..510ae5c1
--- /dev/null
+++ b/packages/wallet-service/tests/hasTxOutsideFirstAddr.test.ts
@@ -0,0 +1,140 @@
+import { APIGatewayProxyResult } from 'aws-lambda';
+
+import { get } from '@src/api/hasTxOutsideFirstAddr';
+import { ApiError } from '@src/api/errors';
+import { closeDbConnection, getDbConnection } from '@src/utils';
+import {
+  ADDRESSES,
+  XPUBKEY,
+  AUTH_XPUBKEY,
+  addToAddressTable,
+  addToWalletTable,
+  cleanDatabase,
+  makeGatewayEventWithAuthorizer,
+} from '@tests/utils';
+
+const mysql = getDbConnection();
+
+beforeEach(async () => {
+  await cleanDatabase(mysql);
+});
+
+afterAll(async () => {
+  await closeDbConnection(mysql);
+});
+
+describe('GET /wallet/addresses/has-transactions-outside-first-address', () => {
+  it('should return 404 when wallet is not found', async () => {
+    expect.hasAssertions();
+
+    const event = makeGatewayEventWithAuthorizer('non-existent-wallet', null);
+    const result = await get(event, null, null) as APIGatewayProxyResult;
+    const body = JSON.parse(result.body as string);
+
+    expect(result.statusCode).toBe(404);
+    expect(body.success).toBe(false);
+    expect(body.error).toBe(ApiError.WALLET_NOT_FOUND);
+  });
+
+  it('should return 400 when wallet is not ready', async () => {
+    expect.hasAssertions();
+
+    const walletId = 'wallet-not-ready';
+    await addToWalletTable(mysql, [{
+      id: walletId,
+      xpubkey: XPUBKEY,
+      authXpubkey: AUTH_XPUBKEY,
+      status: 'creating',
+      maxGap: 5,
+      createdAt: 10000,
+      readyAt: null,
+    }]);
+
+    const event = makeGatewayEventWithAuthorizer(walletId, null);
+    const result = await get(event, null, null) as APIGatewayProxyResult;
+    const body = JSON.parse(result.body as string);
+
+    expect(result.statusCode).toBe(400);
+    expect(body.success).toBe(false);
+    expect(body.error).toBe(ApiError.WALLET_NOT_READY);
+  });
+
+  it('should return hasTransactions=false when no non-first address has transactions', async () => {
+    expect.hasAssertions();
+
+    const walletId = 'my-wallet';
+    await addToWalletTable(mysql, [{
+      id: walletId,
+      xpubkey: XPUBKEY,
+      authXpubkey: AUTH_XPUBKEY,
+      status: 'ready',
+      maxGap: 5,
+      createdAt: 10000,
+      readyAt: 10001,
+    }]);
+    await addToAddressTable(mysql, [
+      { address: ADDRESSES[0], index: 0, walletId, transactions: 10 },
+      { address: ADDRESSES[1], index: 1, walletId, transactions: 0 },
+    ]);
+
+    const event = makeGatewayEventWithAuthorizer(walletId, null);
+    const result = await get(event, null, null) as APIGatewayProxyResult;
+    const body = JSON.parse(result.body as string);
+
+    expect(result.statusCode).toBe(200);
+    expect(body.success).toBe(true);
+    expect(body.hasTransactions).toBe(false);
+  });
+
+  it('should return hasTransactions=true when a non-first address has transactions', async () => {
+    expect.hasAssertions();
+
+    const walletId = 'my-wallet';
+    await addToWalletTable(mysql, [{
+      id: walletId,
+      xpubkey: XPUBKEY,
+      authXpubkey: AUTH_XPUBKEY,
+      status: 'ready',
+      maxGap: 5,
+      createdAt: 10000,
+      readyAt: 10001,
+    }]);
+    await addToAddressTable(mysql, [
+      { address: ADDRESSES[0], index: 0, walletId, transactions: 10 },
+      { address: ADDRESSES[1], index: 1, walletId, transactions: 5 },
+    ]);
+
+    const event = makeGatewayEventWithAuthorizer(walletId, null);
+    const result = await get(event, null, null) as APIGatewayProxyResult;
+    const body = JSON.parse(result.body as string);
+
+    expect(result.statusCode).toBe(200);
+    expect(body.success).toBe(true);
+    expect(body.hasTransactions).toBe(true);
+  });
+
+  it('should include CORS headers', async () => {
+    expect.hasAssertions();
+
+    const walletId = 'my-wallet';
+    await addToWalletTable(mysql, [{
+      id: walletId,
+      xpubkey: XPUBKEY,
+      authXpubkey: AUTH_XPUBKEY,
+      status: 'ready',
+      maxGap: 5,
+      createdAt: 10000,
+      readyAt: 10001,
+    }]);
+
+    const event = makeGatewayEventWithAuthorizer(walletId, null);
+    event.httpMethod = 'XXX';
+    const result = await get(event, null, null) as APIGatewayProxyResult;
+
+    expect(result.headers).toStrictEqual(
+      expect.objectContaining({
+        'Access-Control-Allow-Origin': '*',
+      }),
+    );
+  });
+});