21btc.cc Bitcoin Data

Connect it to your AI

Claude Code

claude mcp add --transport http bitcoin-data https://21btc.cc/mcp

Claude, ChatGPT, Cursor and other apps

Add it as a custom connector with this URL (Streamable HTTP):

https://21btc.cc/mcp

Cursor, VS Code and other apps (mcp.json)

{
  "mcpServers": {
    "bitcoin-data": {
      "url": "https://21btc.cc/mcp"
    }
  }
}

Tools it offers

14 tools, as the server itself reported during our check on Oct 31, 2026.

• get_priceLive BTC price in USD and 7 other currencies (official FX reference rates). Same data as GET /api/v1/price. Read-only.
• get_etf_flowsUS spot Bitcoin ETFs: BTC held, fee, latest/5d/20d/cumulative flows (USD millions). Same data as GET /api/v1/etf. Read-only.
• get_risk_scoreRisk On/Off composite score (0–100) with every input, formula and source. Same data as GET /api/v1/risk. Read-only.
• get_volatilityAnnualised realised volatility over 7/30/90/365 days and by year. Same data as GET /api/v1/volatility. Read-only.
• get_holdersBitcoin holders: companies, funds, governments (BTC, 7-day change). Same data as GET /api/v1/holders. Read-only.
• get_rainbow_modelRainbow model fit parameters and today's deviation (a model, not a forecast). Same data as GET /api/v1/rainbow. Read-only.
• get_stock_to_flowStock-to-flow ratio and PlanB 2019 model value (a model, not a forecast). Same data as GET /api/v1/stock-to-flow. Read-only.
• get_network_statsBitcoin network now: block height, hashrate (EH/s), difficulty and the next difficulty adjustment, mempool size, average block time, halving countdown. Sources: mempool.space, blockchain.info, Blockchair. Read-only.
• get_feesRecommended Bitcoin transaction fees in sat/vB (fastest, 30 minutes, 1 hour, economy, minimum) and mempool size, from mempool.space. Read-only.
• get_derivativesBTC perpetual futures on Binance, Bybit, OKX and Deribit: open interest (BTC and USD), mark price, funding rate per interval and annualised, a 30-day Binance open interest history and recent OKX liquidations. Public keyl
• get_holder_distributionHow many Bitcoin addresses hold at least 0.1, 1, 10, 100, 1,000 and 10,000 BTC and how coins split across holder classes. Addresses, not people. Source: BitInfoCharts and four cross-checks, with an as-of date. Read-only.
• search_siteSearch the site's pages, Bitcoin glossary terms, wiki articles, blog posts, videos, pools, wallets and hacks. Matches English and Russian. Returns title, kind, URL and a short summary. Use kind=glossary for definitions.
• get_eventsUpcoming Bitcoin-only conferences with dates, city, official URL, ticket offer (price only where verified on the official page) and the 21btc.cc event page where one exists. Dates in the venue's local time. Read-only.
• get_changelogRecent shipped changes to 21btc.cc with dates and links. Same data as the /changelog page and its RSS feed. Read-only.

Questions