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eth-mcp

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eth-mcp is an MCP server enabling standardized querying of the Ethereum blockchain using JSON-RPC methods. It provides key Ethereum RPC tools such as retrieving contract code, fetching current gas prices, and checking account balances. This server allows AI applications and assistants to interact with Ethereum blockchain data seamlessly and securely through the Model Context Protocol, facilitating blockchain-aware workflows and integrations.

Use This MCP server To

Retrieve smart contract code at specific Ethereum addresses Fetch current gas price for transaction cost estimation Check Ethereum account balances in real-time Integrate Ethereum blockchain data into AI workflows Enable AI assistants to query blockchain state Automate blockchain data retrieval for dApp development

README

Ethereum RPC MCP Server

A Model Context Protocol (MCP) server for interacting with Ethereum blockchain.

Overview

This MCP server provides tools to query Ethereum blockchain data through standard JSON-RPC methods. It enables AI assistants and applications to interact with the Ethereum blockchain through a standardized protocol.

Features

This MCP server provides three key Ethereum RPC methods as tools:

  • eth_getCode: Retrieve the code at a specific Ethereum address
  • eth_gasPrice: Get the current gas price on the Ethereum network
  • eth_getBalance: Check the balance of an Ethereum account

Note: More are coming

Usage

Adding to Cursor

To add this MCP to Cursor:

  1. First, clone this repository:

    git clone https://github.com/yourusername/eth-mpc.git

  2. Go to Cursor settings → MCP → Add new MCP server

  3. Enter a name (e.g., "eth-mcp")

  4. Select "command" as the type

  5. Input the full path to the script:

    node /path/to/eth-mpc/index.js

Adding Ethereum MCP to Cursor

  1. Click "Add" to enable the server

Once added, the Ethereum RPC tools will be available to use within Cursor.

The server uses stdio transport, making it compatible with MCP clients like Claude Desktop, Cursor, and others.

Testing with MCP Inspector

The MCP Inspector is a development tool for testing and debugging MCP servers. It provides an interactive interface to test your MCP server's functionality without needing a full AI client.

Running the Inspector

To test your Ethereum RPC MCP server with the Inspector:

To run the Inspector:

npx @modelcontextprotocol/inspector

  1. Input the command and path

  2. The Inspector will connect to your running MCP server and display available tools.

Testing Tools with Inspector

The Inspector allows you to:

  • View available tools and their descriptions
  • Test each tool with different parameters
  • See the responses in a structured format
  • Debug any issues with your MCP server implementation

For example, to test the eth_getBalance tool:

  1. Select the tool in the Inspector interface
  2. Enter a valid Ethereum address (e.g., 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 - Vitalik's address)
  3. Use the default block parameter (latest)
  4. Submit the request and view the response

Integration with MCP Clients

This MCP server can be integrated with any MCP-compatible client, including:

  • Claude Desktop
  • Claude Code
  • Cursor (instructions above)
  • Cline
  • Other MCP-compatible applications

When integrated, the client application can use the tools provided by this server to query Ethereum blockchain data directly.

Understanding MCP

Model Context Protocol (MCP) is an open standard that allows AI models to interact with various tools and services. It provides a standardized way for developers to expose APIs, data sources, and functionality to AI assistants.

Learn More About MCP

MCP servers like this one form part of an ecosystem that allows AI assistants to perform complex tasks across multiple services without requiring custom integration for each service.

📚 Official Documentation: Model Context Protocol Overview

License

MIT

Contributing

Contributions are welcome! Please feel free to submit a Pull Request.

eth-mcp FAQ

How do I add eth-mcp to my MCP host?
Clone the repository, then add it in Cursor settings under MCP servers by specifying the script path.
What Ethereum RPC methods does eth-mcp support?
Currently, it supports eth_getCode, eth_gasPrice, and eth_getBalance, with more planned.
Can eth-mcp be used with multiple LLM providers?
Yes, it is provider-agnostic and works with OpenAI, Claude, Gemini, and others.
Is eth-mcp limited to read-only blockchain queries?
Yes, it currently supports read-only JSON-RPC methods for querying blockchain data.
How does eth-mcp ensure secure interaction with the Ethereum network?
It uses standard JSON-RPC calls scoped to specific methods, minimizing risk and exposure.
Can I extend eth-mcp with additional Ethereum RPC methods?
Yes, the server is designed to be extensible with more RPC methods added over time.
What environment is required to run eth-mcp?
It requires a Node.js environment to run the server script as described in the setup instructions.