diff --git a/packages/rest-api/src/controllers/bridgeTxStatusController.ts b/packages/rest-api/src/controllers/bridgeTxStatusController.ts
index a0074a954e..a8eadc173e 100644
--- a/packages/rest-api/src/controllers/bridgeTxStatusController.ts
+++ b/packages/rest-api/src/controllers/bridgeTxStatusController.ts
@@ -15,10 +15,14 @@ export const bridgeTxStatusController = async (req, res) => {
   try {
     const { destChainId, bridgeModule, synapseTxId } = req.query
 
+    const txIdWith0x = !synapseTxId.startsWith('0x')
+      ? `0x${synapseTxId}`
+      : synapseTxId
+
     const status = await Synapse.getBridgeTxStatus(
       Number(destChainId),
       bridgeModule,
-      synapseTxId
+      txIdWith0x
     )
 
     if (status) {
diff --git a/packages/rest-api/src/routes/bridgeTxStatusRoute.ts b/packages/rest-api/src/routes/bridgeTxStatusRoute.ts
index 85227c760f..a9a22e65b1 100644
--- a/packages/rest-api/src/routes/bridgeTxStatusRoute.ts
+++ b/packages/rest-api/src/routes/bridgeTxStatusRoute.ts
@@ -5,6 +5,7 @@ import { showFirstValidationError } from '../middleware/showFirstValidationError
 import { bridgeTxStatusController } from '../controllers/bridgeTxStatusController'
 import { CHAINS_ARRAY } from '../constants/chains'
 import { VALID_BRIDGE_MODULES } from '../constants'
+import { validateKappa } from '../validations/validateKappa'
 
 const router = express.Router()
 
@@ -134,7 +135,10 @@ router.get(
     check('synapseTxId')
       .exists()
       .withMessage('synapseTxId is required')
-      .isString(),
+      .isString()
+      .withMessage('synapseTxId must be a string')
+      .custom((value) => validateKappa(value))
+      .withMessage('synapseTxId must be valid hex string'),
   ],
   showFirstValidationError,
   bridgeTxStatusController
diff --git a/packages/rest-api/src/tests/bridgeTxStatusRoute.test.ts b/packages/rest-api/src/tests/bridgeTxStatusRoute.test.ts
index b806ef282b..2a1fa71ed9 100644
--- a/packages/rest-api/src/tests/bridgeTxStatusRoute.test.ts
+++ b/packages/rest-api/src/tests/bridgeTxStatusRoute.test.ts
@@ -64,6 +64,20 @@ describe('Get Bridge TX Status Route', () => {
     expect(response.body.error).toHaveProperty('field', 'synapseTxId')
   }, 10000)
 
+  it('should return 400 for invalid synapseTxId', async () => {
+    const response = await request(app).get('/bridgeTxStatus').query({
+      destChainId: '1',
+      bridgeModule: 'SynapseRFQ',
+      synapseTxId: "'0x1234' OR '1'='1'",
+    })
+
+    expect(response.status).toBe(400)
+    expect(response.body.error).toHaveProperty(
+      'message',
+      'synapseTxId must be valid hex string'
+    )
+  }, 10000)
+
   it('should return 400 for missing destChainId', async () => {
     const response = await request(app).get('/bridgeTxStatus').query({
       bridgeModule: 'bridge',
diff --git a/packages/rest-api/src/validations/validateKappa.ts b/packages/rest-api/src/validations/validateKappa.ts
new file mode 100644
index 0000000000..22ee8023c9
--- /dev/null
+++ b/packages/rest-api/src/validations/validateKappa.ts
@@ -0,0 +1,11 @@
+export const validateKappa = (synapseTxId: string) => {
+  let hexRegex
+
+  if (synapseTxId.startsWith('0x')) {
+    hexRegex = /^0x[0-9a-fA-F]{64}$/
+  } else {
+    hexRegex = /^[0-9a-fA-F]{64}$/
+  }
+
+  return hexRegex.test(synapseTxId)
+}