MCP EVM Signer

What is MCP EVM Signer?

MCP EVM Signer is a Model Context Protocol (MCP) server for securely managing Ethereum private keys and deploying smart contracts via Infura. It enables Claude for Desktop and other MCP clients to interact with EVM‑compatible blockchains.

How to use MCP EVM Signer?

Clone the repository, install dependencies (npm install), build (npm run build), and configure a .env file with your Infura API key. Then add the server to your Claude for Desktop configuration under mcpServers with the command node pointing to the built build/index.js and required environment variables (INFURA_API_KEY, DEFAULT_NETWORK, ENCRYPT_KEYS, KEY_PASSWORD). Restart Claude for Desktop to use the tools.

Key features of MCP EVM Signer

• Securely store and manage Ethereum private keys locally
• Connect to Infura for blockchain interactions
• Deploy smart contracts from compiled ABIs and bytecode
• Sign and send transactions
• View account balances and transaction history
• Query blockchain data and interact with deployed contracts

Use cases of MCP EVM Signer

• Create a new Ethereum wallet through Claude
• Check the ETH balance of any address on a specified network
• Deploy an ERC‑20 token contract using ABI and bytecode
• Send ETH to another address
• Call read‑only or state‑modifying contract methods

FAQ from MCP EVM Signer

What are the prerequisites for running MCP EVM Signer?

Node.js v16 or higher, an Infura account with an API key, and the Claude for Desktop app installed.

Where are private keys stored and are they encrypted?

Private keys are stored locally on your machine. They can be encrypted with a password by setting ENCRYPT_KEYS: "true" and providing a KEY_PASSWORD in the configuration.

Can I use a mainnet network?

Yes, but the README recommends using test networks like Sepolia or Goerli when getting started. You can set the DEFAULT_NETWORK environment variable to any supported EVM network.

What tools does MCP EVM Signer expose?

Wallet management tools (create-wallet, import-wallet, list-wallets), blockchain operations (check-balance, get-transactions, send-transaction), and smart contract tools (deploy-contract, call-contract, execute-contract).

How do I integrate MCP EVM Signer with Claude for Desktop?

Add the server configuration to Claude’s claude_desktop_config.json under mcpServers, specifying the command, path to the built index.js, and environment variables. Restart Claude to enable the tools.