MCP Etherscan Server

An MCP (Model Context Protocol) server that provides Ethereum blockchain data tools via Etherscan's API. Features include checking ETH balances, viewing transaction history, tracking ERC20 transfers, fetching contract ABIs, monitoring gas prices, and resolving ENS names.

Features

• Balance Checking: Get ETH balance for any Ethereum address
• Transaction History: View recent transactions with detailed information
• Token Transfers: Track ERC20 token transfers with token details
• Contract ABI: Fetch smart contract ABIs for development
• Contract Code: Fetch smart contract code for development
• Gas Prices: Monitor current gas prices (Safe Low, Standard, Fast)
• ENS Resolution: Resolve Ethereum addresses to ENS names

Prerequisites

• Node.js >= 18
• An Etherscan API key (obtain one at https://etherscan.io/apis)

Installation

Installing via Smithery

To install MCP Etherscan Server for Claude Desktop automatically via Smithery:

npx -y @smithery/cli install mcp-etherscan-server --client claude

1. Clone the repository:

git clone [your-repo-url]
cd mcp-etherscan-server

2. Install dependencies:

npm install

3. Create a .env file in the root directory:

ETHERSCAN_API_KEY=your_api_key_here

4. Build the project:

npm run build

Running the Server

Start the server:

npm start

The server runs on stdio, making it compatible with MCP clients like Cursor and Claude Desktop.

How It Works

This server implements the Model Context Protocol (MCP) to provide tools for interacting with Ethereum blockchain data through Etherscan's API. Each tool is exposed as an MCP endpoint that can be called by compatible clients.

Available Tools

1. check-balance

   • Input: Ethereum address
   • Output: ETH balance in both Wei and ETH

2. get-transactions

   • Input: Ethereum address, optional limit
   • Output: Recent transactions with timestamps, values, and addresses

3. get-token-transfers

   • Input: Ethereum address, optional limit
   • Output: Recent ERC20 token transfers with token details

4. get-contract-abi

   • Input: Contract address
   • Output: Contract ABI in JSON format

5. get-contract-code

   • Input: Contract address
   • Output: Contract code in string format

6. get-gas-prices

   • Input: None
   • Output: Current gas prices in Gwei

7. get-ens-name

   • Input: Ethereum address
   • Output: Associated ENS name if available

Using with Cursor

To add this server to Cursor:

1. Open Cursor and go to Cursor settings -> MCP

2. Select the option to either add the MCP Server locally or globally, which will open a JSON configuration file.

3. Add the configuration details. You can either add the MCP server via Smithery or via this repo locally:

   Smithery

   Using smithery.ai (This step requires a smithery.ai account)

   1. Navigate to this URL in your web browser: https://smithery.ai/server/@ThirdGuard/mcp-etherscan-server

   2. Enter your Etherscan API key in the field etherscanApiKey and click the connect button

   3. Navigate to the Cursor tab, copy the command, and run it in your terminal.

   Manual

   Paste the following configuration in the JSON file and replace ETHERSCAN-API-KEY-HERE with your Etherscan API key:

   {
     "Etherscan Tools": {
       "command": "npx",
       "args": [
         "-y",
         "@smithery/cli@latest",
         "run",
         "@ThirdGuard/mcp-etherscan-server",
         "--config",
         "\"{\\\"etherscanApiKey\\\":\\\"ETHERSCAN-API-KEY-HERE\\\"}\""
       ]
     }
   }

   Local

   Paste the following configuration in the JSON file and replace ABSOLUTE-PATH-HERE/mcp-etherscan-server/start.sh with the absolute path to the start.sh in this repo:

   {
     "Etherscan Tools (local)": {
       "command": "ABSOLUTE-PATH-HERE/mcp-etherscan-server/start.sh",
       "args": []
     }
   }

4. Save the configuration

5. The Etherscan tools will now be available in your Cursor AI conversations

Example Usage in Cursor

You can use commands like:

Check the balance of 0x742d35Cc6634C0532925a3b844Bc454e4438f44e

or

Get the code of this smart contract: 0xdAC17F958D2ee523a2206206994597C13D831ec7 (USDT)

Development

To add new features or modify existing ones:

1. The main server logic is in src/server.ts
2. Etherscan API interactions are handled in src/services/etherscanService.ts
3. Run npm run build after making changes

License

MIT License - See LICENSE file for details