diff --git a/README.md b/README.md
index 1f7a3db..f96b1c4 100644
--- a/README.md
+++ b/README.md
@@ -329,6 +329,18 @@ Example query to Claude:
 
 > "Buy $20 worth of OpenRouter credits."
 
+### check_onchain_reputation
+
+Checks the CDP onchain reputation of an Ethereum address.
+
+Parameters:
+
+- `address`: The Ethereum address to check reputation for
+
+Example query to Claude:
+
+> "Check the onchain reputation of 0x1234567890abcdef1234567890abcdef12345678."
+
 ## Security Considerations
 
 - The configuration file contains sensitive information (API keys and seed phrases). Ensure it's properly secured and not shared.
diff --git a/src/tools/index.ts b/src/tools/index.ts
index b254d32..08cf4c9 100644
--- a/src/tools/index.ts
+++ b/src/tools/index.ts
@@ -3,6 +3,7 @@ import { erc20BalanceTool, erc20TransferTool } from './erc20/index.js';
 import { getMorphoVaultsTool } from './morpho/index.js';
 import { getOnrampAssetsTool, onrampTool } from './onramp/index.js';
 import { buyOpenRouterCreditsTool } from './open-router/index.js';
+import { checkReputationTool } from './reputation/index.js';
 import type { ToolHandler, ToolWithHandler } from './types.js';
 
 export const baseMcpTools: ToolWithHandler[] = [
@@ -13,6 +14,7 @@ export const baseMcpTools: ToolWithHandler[] = [
   erc20BalanceTool,
   erc20TransferTool,
   buyOpenRouterCreditsTool,
+  checkReputationTool,
 ];
 
 export const toolToHandler: Record<string, ToolHandler> = baseMcpTools.reduce<
diff --git a/src/tools/reputation/handlers.ts b/src/tools/reputation/handlers.ts
new file mode 100644
index 0000000..7e19e48
--- /dev/null
+++ b/src/tools/reputation/handlers.ts
@@ -0,0 +1,22 @@
+import { ExternalAddress } from '@coinbase/coinbase-sdk';
+import { isAddress } from 'viem';
+import type { PublicActions, WalletClient } from 'viem';
+import type { z } from 'zod';
+import { CheckReputationSchema } from './schemas.js';
+
+export async function checkReputationHandler(
+  wallet: WalletClient & PublicActions,
+  args: z.infer<typeof CheckReputationSchema>,
+): Promise<string> {
+  const { address } = args;
+
+  // Validate the address format
+  if (!isAddress(address, { strict: false })) {
+    throw new Error(`Invalid Ethereum address: ${address}`);
+  }
+
+  const externalAddress = new ExternalAddress('base-mainnet', address);
+  const reputation = await externalAddress.reputation();
+
+  return `Reputation score: ${reputation.score}, Metadata: ${JSON.stringify(reputation.metadata)}`;
+}
diff --git a/src/tools/reputation/index.ts b/src/tools/reputation/index.ts
new file mode 100644
index 0000000..ea8d531
--- /dev/null
+++ b/src/tools/reputation/index.ts
@@ -0,0 +1,10 @@
+import { generateTool } from '../../utils.js';
+import { checkReputationHandler } from './handlers.js';
+import { CheckReputationSchema } from './schemas.js';
+
+export const checkReputationTool = generateTool({
+  name: 'check_onchain_reputation',
+  description: 'Check the onchain reputation of an Ethereum address',
+  inputSchema: CheckReputationSchema,
+  toolHandler: checkReputationHandler,
+});
diff --git a/src/tools/reputation/schemas.ts b/src/tools/reputation/schemas.ts
new file mode 100644
index 0000000..e2849ee
--- /dev/null
+++ b/src/tools/reputation/schemas.ts
@@ -0,0 +1,7 @@
+import { z } from 'zod';
+
+export const CheckReputationSchema = z.object({
+  address: z
+    .string()
+    .describe('The Ethereum address to check CDP onchain reputation for'),
+});