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+---
+title: "Setting up a Base MCP Server for Claude"
+slug: /cookbook/ai-agents/base-mcp-server
+description: Configure a Model Context Protocol (MCP) server to let Claude Desktop directly query the Base blockchain for debugging and analysis.
+authors: [jadonamite]
+tags: [ai, mcp, claude, debugging, rpc]
+---
+
+# Setting up a Base MCP Server
+
+The **Model Context Protocol (MCP)** is a new standard that allows AI assistants (like Claude Desktop) to connect to external data sources.
+
+By building a Base MCP Server, you give Claude "eyes" on the blockchain. Instead of copy-pasting Etherscan links or raw JSON into the chat, you can simply ask: *"Why did transaction 0x123 fail?"* and Claude will query the chain, fetch the receipt, simulate the trace, and explain the error code.
+
+
+
+## Phase 1: The MCP Server Implementation
+
+We will create a lightweight TypeScript server that exposes blockchain tools to Claude.
+
+**1. Initialize Project**
+```bash
+mkdir base-mcp-server
+cd base-mcp-server
+npm init -y
+npm install @modelcontextprotocol/sdk zod ethers
+npm install -D typescript @types/node tsx
+npx tsc --init
+
+```
+
+**2. The Server Code (`index.ts`)**
+This script defines two tools: `get_transaction` and `debug_receipt`. Claude will call these automatically when it needs data.
+
+```typescript
+#!/usr/bin/env node
+import { Server } from "@modelcontextprotocol/sdk/server/index.js";
+import { StdioServerTransport } from "@modelcontextprotocol/sdk/server/stdio.js";
+import { CallToolRequestSchema, ListToolsRequestSchema } from "@modelcontextprotocol/sdk/types.js";
+import { ethers } from "ethers";
+import { z } from "zod";
+
+// Configure Base RPC (Use Alchemy, Infura, or Base Public Endpoint)
+const RPC_URL = "[https://mainnet.base.org](https://mainnet.base.org)";
+const provider = new ethers.JsonRpcProvider(RPC_URL);
+
+// Initialize MCP Server
+const server = new Server(
+  {
+    name: "base-mcp-server",
+    version: "1.0.0",
+  },
+  {
+    capabilities: {
+      tools: {},
+    },
+  }
+);
+
+// 1. Define Available Tools
+server.setRequestHandler(ListToolsRequestSchema, async () => {
+  return {
+    tools: [
+      {
+        name: "get_transaction",
+        description: "Fetch details of a transaction hash on Base Mainnet",
+        inputSchema: {
+          type: "object",
+          properties: {
+            hash: { type: "string", description: "The 0x transaction hash" },
+          },
+          required: ["hash"],
+        },
+      },
+      {
+        name: "get_receipt",
+        description: "Fetch the receipt (logs, status, gas used) to debug failures",
+        inputSchema: {
+          type: "object",
+          properties: {
+            hash: { type: "string", description: "The 0x transaction hash" },
+          },
+          required: ["hash"],
+        },
+      },
+    ],
+  };
+});
+
+// 2. Handle Tool Execution
+server.setRequestHandler(CallToolRequestSchema, async (request) => {
+  const { name, arguments: args } = request.params;
+
+  try {
+    if (name === "get_transaction") {
+      const hash = String(args?.hash);
+      const tx = await provider.getTransaction(hash);
+      return {
+        content: [{ type: "text", text: JSON.stringify(tx, null, 2) }],
+      };
+    }
+
+    if (name === "get_receipt") {
+      const hash = String(args?.hash);
+      const receipt = await provider.getTransactionReceipt(hash);
+      
+      // Enhance debug info: Check status
+      const status = receipt?.status === 1 ? "SUCCESS" : "FAILED";
+      
+      return {
+        content: [{ 
+          type: "text", 
+          text: JSON.stringify({ ...receipt, human_status: status }, null, 2) 
+        }],
+      };
+    }
+
+    throw new Error(`Unknown tool: ${name}`);
+  } catch (error) {
+    return {
+      content: [{ type: "text", text: `Error: ${error instanceof Error ? error.message : String(error)}` }],
+      isError: true,
+    };
+  }
+});
+
+// Start Server via Stdio (Standard Input/Output)
+const transport = new StdioServerTransport();
+await server.connect(transport);
+console.error("Base MCP Server running on stdio...");
+
+```
+
+---
+
+## Phase 2: Configuring Claude Desktop
+
+Claude Desktop needs to know where this server lives. We edit the configuration file to "install" our new tools.
+
+**1. Locate Config File**
+
+* **macOS:** `~/Library/Application Support/Claude/claude_desktop_config.json`
+* **Windows:** `%APPDATA%\Claude\claude_desktop_config.json`
+
+**2. Add Server Configuration**
+Open the file and add the `base-chain` entry. Make sure to point to the absolute path of your project.
+
+```json
+{
+  "mcpServers": {
+    "base-chain": {
+      "command": "npx",
+      "args": [
+        "-y",
+        "tsx",
+        "/ABSOLUTE/PATH/TO/YOUR/base-mcp-server/index.ts"
+      ]
+    }
+  }
+}
+
+```
+
+**3. Restart Claude**
+Close and reopen the Claude Desktop app. You should see a generic "hammer" icon or "Connected to 1 Server" indicator in the input bar.
+
+---
+
+## Phase 3: AI-Assisted Debugging Workflow
+
+Now that Claude is connected to Base, you can perform advanced debugging without writing scripts.
+
+**Scenario: A Failed Transaction**
+You tried to swap tokens, but it failed. You have the hash: `0xabc...123`.
+
+**The Prompt:**
+
+> "Analyze transaction 0xabc...123 on Base. Why did it fail? Check the logs in the receipt."
+
+**What Happens Behind the Scenes:**
+
+1. **Thinking:** Claude recognizes the pattern `0x...` and sees it has a tool named `get_receipt`.
+2. **Tool Call:** It executes `get_receipt(hash: "0xabc...123")` against your local server.
+3. **Network Request:** Your local server uses `ethers.js` to hit the Base RPC.
+4. **Analysis:** Claude receives the JSON receipt. It notices `status: 0` (Revert). It looks at the `logs`. It might see a `Transfer` event followed by a revert, or it might see no logs at all.
+5. **Response:**
+> "The transaction failed with status 0. I see it ran out of gas (Gas Used: 50,000 equals Gas Limit: 50,000). You likely didn't set a high enough gas limit for this complex swap."
+
+
+
+---
+
+## Troubleshooting
+
+* **Error: "ECONNREFUSED"**: Ensure your `RPC_URL` in `index.ts` is valid. Public nodes have rate limits; for heavy debugging, use a dedicated Alchemy/Infura key.
+* **Claude doesn't see tools**: Check the `claude_desktop_config.json` syntax. JSON does not support trailing commas. Ensure the path to `index.ts` is absolute (e.g., `/Users/dev/base-mcp/...`).
+* **Typescript Errors**: If `npx tsx` fails, ensure you installed `tsx` globally or allow `npx` to download it.
+
+```