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21btc.cc Bitcoin Data MCP Server

by 21btc Your server? Claim it
answering

21btc.cc Bitcoin Data is answering right now. Last checked 3 min ago. It exposes 14 tools.

Live Bitcoin price, ETF flows, treasuries, on-chain metrics, fees, derivatives & wiki search.

Uptime history 5 days of history
5 days agonow
100.0%
Uptime 24h
92 of 92 checks
14
Tools
read from the server
211 ms
Response time
average over 24h
open, no key
Access
streamable-http

Nothing serious here today

Today is the operative word: we check 21btc.cc Bitcoin Data every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.

Three servers free · no card

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 3 min ago.

run in your terminal
claude mcp add bitcoin-data --transport http https://21btc.cc/mcp
Settings → Connectors → Add custom connector, then paste this address
https://21btc.cc/mcp
~/.codex/config.toml
[mcp_servers.bitcoin-data]
url = "https://21btc.cc/mcp"
.cursor/mcp.json
{
  "mcpServers": {
    "bitcoin-data": {
      "url": "https://21btc.cc/mcp"
    }
  }
}
.vscode/mcp.json
{
  "servers": {
    "bitcoin-data": {
      "type": "http",
      "url": "https://21btc.cc/mcp"
    }
  }
}

Available tools 14

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

changelog
get_changelog
Recent shipped changes to 21btc.cc with dates and links. Same data as the /changelog page and its RSS feed. Read-only.
derivatives
get_derivatives
BTC 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 keyless exchange APIs, cached 60 seconds. Liquidations cover one exchange only; no free all-exchange total exists. Not advice. Read-only.
etf
get_etf_flows
US spot Bitcoin ETFs: BTC held, fee, latest/5d/20d/cumulative flows (USD millions). Same data as GET /api/v1/etf. Read-only.
events
get_events
Upcoming 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.
fees
get_fees
Recommended Bitcoin transaction fees in sat/vB (fastest, 30 minutes, 1 hour, economy, minimum) and mempool size, from mempool.space. Read-only.
holder
get_holder_distribution
How 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.
holders
get_holders
Bitcoin holders: companies, funds, governments (BTC, 7-day change). Same data as GET /api/v1/holders. Read-only.
network
get_network_stats
Bitcoin 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.
price
get_price
Live BTC price in USD and 7 other currencies (official FX reference rates). Same data as GET /api/v1/price. Read-only.
rainbow
get_rainbow_model
Rainbow model fit parameters and today's deviation (a model, not a forecast). Same data as GET /api/v1/rainbow. Read-only.
risk
get_risk_score
Risk On/Off composite score (0–100) with every input, formula and source. Same data as GET /api/v1/risk. Read-only.
site
search_site
Search 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. Read-only.
stock
get_stock_to_flow
Stock-to-flow ratio and PlanB 2019 model value (a model, not a forecast). Same data as GET /api/v1/stock-to-flow. Read-only.
volatility
get_volatility
Annualised realised volatility over 7/30/90/365 days and by year. Same data as GET /api/v1/volatility. Read-only.

Endpoints

URLTransportStateLatencyChecked
https://21btc.cc/mcp streamable-http answering 162 ms 3 min ago

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21btc.cc Bitcoin Data — questions

Answers built from our own checks of this server.

What can 21btc.cc Bitcoin Data do?
It exposes 14 tools, read directly from the server on our last check. Among them: get_changelog, get_derivatives, get_etf_flows, get_events, get_fees, get_holder_distribution and 8 more. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →
Is 21btc.cc Bitcoin Data working right now?
We send a real MCP handshake every 15 minutes. Over the last 24 hours 92 of 92 checks got a reply (100.0%), average response time 211 ms. The bar chart above shows every period we have measured.
How do I connect 21btc.cc Bitcoin Data?
Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.
Does 21btc.cc Bitcoin Data need an API key?
No. 21btc.cc Bitcoin Data completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 14 of them are readable on this page. This is what we observed, not what the docs claim.
How fast is 21btc.cc Bitcoin Data?
It answers our handshake in 211 ms on average, which is faster than 67% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.