Etherscan MCP server

This MCP Etherscan Server provides Ethereum blockchain data tools using Etherscan's API, allowing you to check balances, view transactions, track token transfers, fetch contract ABIs, monitor gas prices, and resolve ENS names within your MCP-compatible applications.

Prerequisites

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

Installation

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 with:

npm start

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

Available Tools

Check Balance

Gets the ETH balance for any Ethereum address.

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

Get Transactions

Views recent transactions with detailed information.

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

Get Token Transfers

Tracks ERC20 token transfers with token details.

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

Get Contract ABI

Fetches smart contract ABIs for development.

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

Get Gas Prices

Monitors current gas prices.

• Input: None
• Output: Current gas prices (Safe Low, Standard, Fast) in Gwei

Get ENS Name

Resolves Ethereum addresses to ENS names.

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

Using with Claude Desktop

To add this server to Claude Desktop:

1. Start the server using npm start

2. In Claude Desktop:

   • Go to Settings
   • Navigate to the MCP Servers section
   • Click "Add Server"
   • Enter the following configuration:

     {
       "name": "Etherscan Tools",
       "transport": "stdio",
       "command": "node /path/to/mcp-etherscan-server/build/index.js"
     }
     

   • Save the configuration

3. The Etherscan tools will now be available in your Claude conversations

Example Usage

You can use commands like:

Check the balance of 0x742d35Cc6634C0532925a3b844Bc454e4438f44e

or

Show me recent transactions for vitalik.eth

How to install this MCP server

For Claude Code

To add this MCP server to Claude Code, run this command in your terminal:

claude mcp add-json "etherscan-tools" '{"command":"node","args":["/path/to/mcp-etherscan-server/build/index.js"]}'

See the official Claude Code MCP documentation for more details.

For Cursor

There are two ways to add an MCP server to Cursor. The most common way is to add the server globally in the ~/.cursor/mcp.json file so that it is available in all of your projects.

If you only need the server in a single project, you can add it to the project instead by creating or adding it to the .cursor/mcp.json file.

Adding an MCP server to Cursor globally

To add a global MCP server go to Cursor Settings > Tools & Integrations and click "New MCP Server".

When you click that button the ~/.cursor/mcp.json file will be opened and you can add your server like this:

{
    "mcpServers": {
        "etherscan-tools": {
            "command": "node",
            "args": [
                "/path/to/mcp-etherscan-server/build/index.js"
            ]
        }
    }
}

Adding an MCP server to a project

To add an MCP server to a project you can create a new .cursor/mcp.json file or add it to the existing one. This will look exactly the same as the global MCP server example above.

How to use the MCP server

Once the server is installed, you might need to head back to Settings > MCP and click the refresh button.

The Cursor agent will then be able to see the available tools the added MCP server has available and will call them when it needs to.

You can also explicitly ask the agent to use the tool by mentioning the tool name and describing what the function does.

For Claude Desktop

To add this MCP server to Claude Desktop:

1. Find your configuration file:

• macOS: ~/Library/Application Support/Claude/claude_desktop_config.json
• Windows: %APPDATA%\Claude\claude_desktop_config.json
• Linux: ~/.config/Claude/claude_desktop_config.json

2. Add this to your configuration file:

{
    "mcpServers": {
        "etherscan-tools": {
            "command": "node",
            "args": [
                "/path/to/mcp-etherscan-server/build/index.js"
            ]
        }
    }
}

3. Restart Claude Desktop for the changes to take effect