diff --git a/packages/indexer-common/src/errors.ts b/packages/indexer-common/src/errors.ts
index 01af19fa2..f555d7523 100644
--- a/packages/indexer-common/src/errors.ts
+++ b/packages/indexer-common/src/errors.ts
@@ -85,6 +85,7 @@ export enum IndexerErrorCode {
   IE072 = 'IE072',
   IE073 = 'IE073',
   IE074 = 'IE074',
+  IE075 = 'IE075',
 }
 
 export const INDEXER_ERROR_MESSAGES: Record<IndexerErrorCode, string> = {
@@ -163,6 +164,7 @@ export const INDEXER_ERROR_MESSAGES: Record<IndexerErrorCode, string> = {
   IE072: 'Failed to execute batch tx (contract: staking)',
   IE073: 'Failed to query subgraph features from indexing statuses endpoint',
   IE074: 'Failed to deploy subgraph: network not supported',
+  IE075: 'Failed to connect to network contracts',
 }
 
 export type IndexerErrorCause = unknown
diff --git a/packages/indexer-service/src/commands/start.ts b/packages/indexer-service/src/commands/start.ts
index 7e4e7c71d..4d97a868f 100644
--- a/packages/indexer-service/src/commands/start.ts
+++ b/packages/indexer-service/src/commands/start.ts
@@ -11,6 +11,7 @@ import {
   createLogger,
   createMetrics,
   createMetricsServer,
+  NetworkContracts,
   SubgraphDeploymentID,
   toAddress,
 } from '@graphprotocol/common-ts'
@@ -32,6 +33,7 @@ import { createServer } from '../server'
 import { QueryProcessor } from '../queries'
 import { ensureAttestationSigners, monitorEligibleAllocations } from '../allocations'
 import { AllocationReceiptManager } from '../query-fees'
+import pRetry from 'p-retry'
 
 export default {
   command: 'start',
@@ -333,7 +335,7 @@ export default {
       chainId: networkIdentifier.chainId,
     })
 
-    let contracts = undefined
+    let contracts: NetworkContracts | undefined = undefined
     try {
       contracts = await connectContracts(
         networkProvider,
@@ -343,11 +345,8 @@ export default {
     } catch (error) {
       logger.error(
         `Failed to connect to contracts, please ensure you are using the intended Ethereum Network`,
-        {
-          error,
-        },
       )
-      throw error
+      throw indexerError(IndexerErrorCode.IE075, error)
     }
 
     logger.info('Successfully connected to contracts', {
@@ -377,6 +376,44 @@ export default {
       operator: address.toString(),
     })
 
+    // Validate the operator wallet matches the operator set for the indexer
+    const isOperator = await pRetry(
+      async () =>
+        contracts!.staking.isOperator(
+          wallet.address.toString(),
+          indexerAddress.toString(),
+        ),
+      {
+        retries: 10,
+        maxTimeout: 10000,
+        onFailedAttempt: err => {
+          logger.warn(
+            `contracts.staking.isOperator(${wallet.address.toString()}, ${indexerAddress.toString()}) failed`,
+            {
+              attempt: err.attemptNumber,
+              retriesLeft: err.retriesLeft,
+              err: err.message,
+            },
+          )
+        },
+      } as pRetry.Options,
+    )
+
+    if (isOperator == false) {
+      logger.error(
+        'Operator wallet is not allowed for indexer, please see attached debug suggestions',
+        {
+          debugSuggestion1: 'verify that operator wallet is set for indexer account',
+          debugSuggestion2:
+            'verify that service and agent are both using correct operator wallet mnemonic',
+        },
+      )
+      throw indexerError(
+        IndexerErrorCode.IE034,
+        `contracts.staking.isOperator returned 'False'`,
+      )
+    }
+
     // Monitor indexer allocations that we may receive traffic for
     const allocations = monitorEligibleAllocations({
       indexer: indexerAddress,