Etherscan MCP server

This dynamic MCP server enables interaction with Etherscan's API and services, allowing you to access blockchain data through the Model Context Protocol. It provides a convenient way to integrate Etherscan functionality with AI systems that support MCP.

Installation and Setup

Prerequisites

Before using the Etherscan MCP server, you'll need:

1. Node.js installed on your system
2. An Etherscan API key (obtain one from Etherscan's website)

Quick Start

You can run the Etherscan MCP server directly using the fastmcp tool:

npx fastmcp dev src/index.ts

This command starts the server in development mode, allowing you to test its functionality.

Usage Options

Testing with MCP CLI

The simplest way to test and debug your server is with the fastmcp dev command:

npx fastmcp dev src/index.ts

This runs your server with mcp-cli for terminal-based testing and debugging.

Using MCP Inspector

For a more visual interface, you can use the MCP Inspector tool:

npx fastmcp inspect src/index.ts

This launches a web UI that allows you to inspect and interact with your MCP server.

Integration with Claude Desktop

To use this MCP server with Claude Desktop:

1. Make sure you have Claude Desktop installed
2. Update your Claude configuration with the following:

{
  "mcpServers": {
    "etherscan_mcp": {
      "command": "npx",
      "args": ["tsx", "/PATH/TO/YOUR_PROJECT/src/index.ts"],
      "env": {
        "ETHERSCAN_API_KEY": "YOUR_API_KEY_HERE"
      }
    }
  }
}

Be sure to:

• Replace /PATH/TO/YOUR_PROJECT/ with the actual path to your project
• Replace YOUR_API_KEY_HERE with your actual Etherscan API key

Supported Features

The server supports various Etherscan API endpoints as documented at https://docs.etherscan.io/etherscan-v2.

Supported Chains

This MCP server works with multiple blockchain networks supported by Etherscan. For a complete list of supported chains, visit: https://docs.etherscan.io/etherscan-v2/getting-started/supported-chains

Note that not all endpoints are supported by all chains. You can check endpoint compatibility at: https://forms.blockscan.com/public/grid/3E9QiN00NLhCQVibiP3Z-Bpqhmd7zGXsgapEKJupxiI

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_mcp" '{"command":"npx","args":["tsx","src/index.ts"],"env":{"ETHERSCAN_API_KEY":"********"}}'

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_mcp": {
            "command": "npx",
            "args": [
                "tsx",
                "src/index.ts"
            ],
            "env": {
                "ETHERSCAN_API_KEY": "********"
            }
        }
    }
}

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_mcp": {
            "command": "npx",
            "args": [
                "tsx",
                "src/index.ts"
            ],
            "env": {
                "ETHERSCAN_API_KEY": "********"
            }
        }
    }
}

3. Restart Claude Desktop for the changes to take effect