Onchain Data MCP server

onchain-data-mcp

Give your AI assistant live blockchain data: wallet balances, payments, prices, scam checks and more. Free to start, no sign-ups needed.

The Claude Desktop button downloads a file you double-click; it has everything inside.

The Cursor and VS Code buttons only add the settings, so install the program first.

onchain-data-mcp is one small program that lets AI apps like Claude, Cursor and VS Code read the blockchain. It works with Ethereum, Base, Arbitrum, Optimism, Polygon, Avalanche, BNB Chain, Robinhood Chain and Solana.

Behind the scenes it asks about 30 data services ("providers") for you. If one is slow, busy or down, it quietly asks the next one. Free services come first, so you can start without paying anything and without any sign-ups.

A few words you will see here:

• MCP is a standard way for AI apps like Claude to use outside tools. This program is an "MCP server": a tool your AI app can use.
• API key is a free password a data provider gives you when you sign up. You don't need any to start. Adding a couple makes answers faster and more complete.
• Wallet address is the public "account number" of a crypto wallet, like 0xd8dA…6045 or 7xKX…9sHc.

Contents

• What you can do
• Quick start
• Connect to AI apps
• The dashboard
• Password and keys
• Data providers
• Available tools
• Real-world examples
• Running it for others
• Troubleshooting
• FAQ
• For developers · Security · License

What you can do

Ask your AI assistant questions in plain words. It picks the right tool and gets the answer.

Shortened. The full README is on GitHub.