This file is self contained. It reads public data only and never writes to the machine. All output is bounded and honest about what could not be fetched.

Tools

ticker Bitcoin price in USD, EUR, GBP, JPY and BTC, with buy/sell spreads.
latest_block The latest Bitcoin block: height, hash, mining time and transaction count.
network_stats Bitcoin network health: hash rate, difficulty, block pace, 24h transaction count, miner revenue and total coins mined.
address Bitcoin address summary: transaction count, total received/sent, balance and recent transactions.
address_balance Check the balance of up to 20 Bitcoin addresses at once, comma or space separated.
transaction Look up a Bitcoin transaction by hash: size, fee, inputs, outputs and the largest payments.
block_by_height Bitcoin block at a height: hash, mining time, size, weight, total fees and neighbouring blocks.
block_by_hash Bitcoin block by its 64-character hash, with the same size, fee and chain fields as block_by_height.
mempool Pending Bitcoin transactions: mempool depth plus fees and sizes of the newest waiting transactions.

Usage

npm install
npm run build
node dist/index.js

Premium tools

These tools need a license key:

coin_supply
address_timeline

Buy a key at https://mcp-marketplace.io/server/io-github-mrfentmen-blockchain-info-mcp and set it in your MCP client config:

"env": { "MCP_LICENSE_KEY": "mcp_live_..." }

The key is checked against MCP Marketplace, cached for 24 hours, and keeps working offline once one check has succeeded. Every other tool on this server stays free.