MCP server · Finance and crypto

Bankless Onchain MCP server

Lets your AI look up blockchain contracts, tokens and transactions through the Bankless API.

This is a helper that connects your AI assistant to blockchain data through the Bankless Onchain API. It is handy if you work with crypto and want to ask plain questions about a contract, a token or a wallet without clicking through block explorers. You still need a Bankless API token, and the project is no longer receiving updates.

What is an MCP server? The 30-second version

On its own, your AI can only chat with you. An MCP server is a small helper program that gives your AI a new skill or a connection to an outside service. This one connects your AI to the Bankless Onchain API, which holds blockchain information. Once it is set up, your AI can look up contracts, events and transactions for you when you ask.

What this MCP server does

You ask your AI a question about something on a blockchain, like what a contract does or what a wallet has been up to. Your AI sends that request to this helper, and the helper calls the Bankless Onchain API for you. The API returns the raw blockchain data, such as contract results, event logs or transaction details. The helper passes it back to your AI, and your AI explains it in normal words in the chat.

Flow diagram: you ask your AI “What did this wallet do lately on Polygon?”, the Bankless Onchain MCP server connects it to Bankless Onchain, and you get back plain answer in your chat.

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What you can do with it

Read the current state of a smart contract on a network like Ethereum or Polygon
Find the real implementation address behind a proxy contract
Fetch a contract's ABI and its verified source code
Look up event logs for a contract using a topic filter
Build an event topic signature from an event name and argument types
Get the transaction history for a wallet address
Get the details of one specific transaction by its hash

Try asking your AI

“Read the balanceOf for this wallet address on this token contract on Ethereum”
“Is this contract a proxy? If so, give me the implementation address and its source code”
“Show me the recent Transfer events for this token contract on Base”
“What did this wallet address do in its last ten transactions on Polygon?”

What it gives back to you

You get answers in the chat, built from the raw data the API sends back. That can be a list of transactions with hashes and timestamps, event logs, contract call results with their types, or a contract's source code and ABI. Your AI usually turns these into a short explanation or a table instead of dumping the raw JSON on you.

Before you start

What you need

A Bankless API token, which is a kind of password you get from the Bankless docs site
Node.js installed on your computer so the npx command can run
An AI app that supports MCP servers, like the Claude desktop app

Good to know

It only reads blockchain data through the Bankless API, so it does not move funds or change contracts, but it does use your API token and may hit rate limits.

Install it with your AI

Add Bankless Onchain MCP server to your AI, no technical skills needed

You don't install anything by hand. You copy one prompt, paste it into an AI that can work on your computer, and it checks, installs and connects the server for you, asking you when it needs something.

Sign in to get the install prompt

Members get a ready-made prompt that lets the Claude desktop app check Bankless Onchain MCP server, install it and connect it for them, step by step. You don't need any technical skills: you copy, paste and answer a few questions. Your connected AI can also find and install any of the 4,066 MCP servers here for you.