diff --git a/indexer/packages/postgres/__tests__/helpers/constants.ts b/indexer/packages/postgres/__tests__/helpers/constants.ts
index aeaedeae3c9..2f1df758197 100644
--- a/indexer/packages/postgres/__tests__/helpers/constants.ts
+++ b/indexer/packages/postgres/__tests__/helpers/constants.ts
@@ -78,7 +78,7 @@ export const blockedAddress: string = 'dydx1f9k5qldwmqrnwy8hcgp4fw6heuvszt35egvt
 export const vaultAddress: string = 'dydx1c0m5x87llaunl5sgv3q5vd7j5uha26d2q2r2q0';
 
 // ============== Subaccounts ==============
-export const defaultWalletAddress: string = 'defaultWalletAddress';
+export const defaultWalletAddress: string = 'dydx199tqg4wdlnu4qjlxchpd7seg454937hjrknju4';
 
 export const defaultSubaccount: SubaccountCreateObject = {
   address: defaultAddress,
diff --git a/indexer/pnpm-lock.yaml b/indexer/pnpm-lock.yaml
index dd450739665..5d1e3613d20 100644
--- a/indexer/pnpm-lock.yaml
+++ b/indexer/pnpm-lock.yaml
@@ -470,6 +470,7 @@ importers:
       '@types/response-time': ^2.3.5
       '@types/supertest': ^2.0.12
       '@types/swagger-ui-express': ^4.1.3
+      bech32: 1.1.4
       big.js: ^6.2.1
       binary-searching: ^2.0.5
       body-parser: ^1.20.0
@@ -510,6 +511,7 @@ importers:
       '@dydxprotocol-indexer/v4-protos': link:../../packages/v4-protos
       '@keplr-wallet/cosmos': 0.12.122
       '@tsoa/runtime': 5.0.0
+      bech32: 1.1.4
       big.js: 6.2.1
       binary-searching: 2.0.5
       body-parser: 1.20.0
diff --git a/indexer/services/comlink/__tests__/controllers/api/v4/addresses-controller.test.ts b/indexer/services/comlink/__tests__/controllers/api/v4/addresses-controller.test.ts
index aeed6ffb785..dc3bac60a91 100644
--- a/indexer/services/comlink/__tests__/controllers/api/v4/addresses-controller.test.ts
+++ b/indexer/services/comlink/__tests__/controllers/api/v4/addresses-controller.test.ts
@@ -22,6 +22,7 @@ import { Secp256k1 } from '@cosmjs/crypto';
 import { toBech32 } from '@cosmjs/encoding';
 import { DateTime } from 'luxon';
 import { verifyADR36Amino } from '@keplr-wallet/cosmos';
+import { defaultAddress3 } from '@dydxprotocol-indexer/postgres/build/__tests__/helpers/constants';
 
 jest.mock('@cosmjs/crypto', () => ({
   ...jest.requireActual('@cosmjs/crypto'),
@@ -211,7 +212,7 @@ describe('addresses-controller#V4', () => {
     it('Get / with non-existent address and subaccount number returns 404', async () => {
       const response: request.Response = await sendRequest({
         type: RequestMethod.GET,
-        path: `/v4/addresses/${invalidAddress}/subaccountNumber/` +
+        path: `/v4/addresses/${defaultAddress3}/subaccountNumber/` +
         `${testConstants.defaultSubaccount.subaccountNumber}`,
         expectedStatus: 404,
       });
@@ -219,7 +220,7 @@ describe('addresses-controller#V4', () => {
       expect(response.body).toEqual({
         errors: [
           {
-            msg: `No subaccount found with address ${invalidAddress} and ` +
+            msg: `No subaccount found with address ${defaultAddress3} and ` +
             `subaccountNumber ${testConstants.defaultSubaccount.subaccountNumber}`,
           },
         ],
@@ -405,21 +406,19 @@ describe('addresses-controller#V4', () => {
       const response: request.Response = await sendRequest({
         type: RequestMethod.GET,
         path: `/v4/addresses/${invalidAddress}`,
-        expectedStatus: 404,
+        expectedStatus: 400,
       });
 
       expect(response.body).toEqual({
         errors: [
           {
-            msg: `No subaccounts found for address ${invalidAddress}`,
+            msg: 'address must be a valid dydx address',
+            location: 'params',
+            param: 'address',
+            value: 'invalidAddress',
           },
         ],
       });
-      expect(stats.increment).toHaveBeenCalledWith('comlink.addresses-controller.response_status_code.404', 1,
-        {
-          path: '/:address',
-          method: 'GET',
-        });
     });
   });
 
@@ -561,7 +560,7 @@ describe('addresses-controller#V4', () => {
   it('Get /:address/parentSubaccountNumber/ with non-existent address returns 404', async () => {
     const response: request.Response = await sendRequest({
       type: RequestMethod.GET,
-      path: `/v4/addresses/${invalidAddress}/parentSubaccountNumber/` +
+      path: `/v4/addresses/${defaultAddress3}/parentSubaccountNumber/` +
           `${testConstants.defaultSubaccount.subaccountNumber}`,
       expectedStatus: 404,
     });
@@ -569,7 +568,7 @@ describe('addresses-controller#V4', () => {
     expect(response.body).toEqual({
       errors: [
         {
-          msg: `No subaccounts found for address ${invalidAddress} and ` +
+          msg: `No subaccounts found for address ${defaultAddress3} and ` +
               `parentSubaccountNumber ${testConstants.defaultSubaccount.subaccountNumber}`,
         },
       ],
@@ -737,14 +736,13 @@ describe('addresses-controller#V4', () => {
       expect(response.body).toEqual({
         errors: [
           {
-            msg: 'Address invalidAddress is not a valid dYdX V4 address',
+            msg: 'address must be a valid dydx address',
+            location: 'params',
+            param: 'address',
+            value: 'invalidAddress',
           },
         ],
       });
-      expect(statsSpy).toHaveBeenCalledWith('comlink.addresses-controller.response_status_code.400', 1, {
-        path: '/:address/registerToken',
-        method: 'POST',
-      });
     });
 
     it.each([
diff --git a/indexer/services/comlink/package.json b/indexer/services/comlink/package.json
index 448ac57866c..fa92b9548b7 100644
--- a/indexer/services/comlink/package.json
+++ b/indexer/services/comlink/package.json
@@ -35,6 +35,7 @@
     "@dydxprotocol-indexer/v4-protos": "workspace:^0.0.1",
     "@keplr-wallet/cosmos": "^0.12.122",
     "@tsoa/runtime": "^5.0.0",
+    "bech32": "1.1.4",
     "big.js": "^6.2.1",
     "binary-searching": "^2.0.5",
     "body-parser": "^1.20.0",
diff --git a/indexer/services/comlink/src/lib/validation/schemas.ts b/indexer/services/comlink/src/lib/validation/schemas.ts
index 98e1d2ed7e0..68df7664d10 100644
--- a/indexer/services/comlink/src/lib/validation/schemas.ts
+++ b/indexer/services/comlink/src/lib/validation/schemas.ts
@@ -1,9 +1,12 @@
+import * as console from 'node:console';
+
 import { isValidLanguageCode } from '@dydxprotocol-indexer/notifications';
 import {
   perpetualMarketRefresher,
   MAX_PARENT_SUBACCOUNTS,
   CHILD_SUBACCOUNT_MULTIPLIER,
 } from '@dydxprotocol-indexer/postgres';
+import { decode } from 'bech32';
 import { body, checkSchema, ParamSchema } from 'express-validator';
 
 import config from '../../config';
@@ -12,6 +15,10 @@ export const CheckSubaccountSchema = checkSchema({
   address: {
     in: ['params', 'query'],
     isString: true,
+    custom: {
+      options: isValidAddress,
+    },
+    errorMessage: 'address must be a valid dydx address',
   },
   subaccountNumber: {
     in: ['params', 'query'],
@@ -26,6 +33,10 @@ export const CheckParentSubaccountSchema = checkSchema({
   address: {
     in: ['params', 'query'],
     isString: true,
+    custom: {
+      options: isValidAddress,
+    },
+    errorMessage: 'address must be a valid dydx address',
   },
   parentSubaccountNumber: {
     in: ['params', 'query'],
@@ -40,6 +51,10 @@ export const checkAddressSchemaRecord: Record<string, ParamSchema> = {
   address: {
     in: ['params'],
     isString: true,
+    custom: {
+      options: isValidAddress,
+    },
+    errorMessage: 'address must be a valid dydx address',
   },
 };
 
@@ -262,3 +277,20 @@ export const RegisterTokenValidationSchema = [
       return true;
     }),
 ];
+
+function verifyIsBech32(address: string): Error | undefined {
+  try {
+    decode(address);
+  } catch (error) {
+    return error;
+  }
+
+  return undefined;
+}
+
+export function isValidAddress(address: string): boolean {
+  // An address is valid if it starts with `dydx1` and is Bech32 format.
+  const ret: boolean = address.startsWith('dydx1') && (verifyIsBech32(address) === undefined);
+  console.log('is valid address: ', ret);
+  return ret;
+}