21btc.cc Bitcoin Data

cc.21btcPublished by 21btc.ccOfficial publisherv1.1.0Updated Oct 29, 2026

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

VerifiedStreamable HTTPWeb executableWeb Search & ScrapingFinance

Overview

AI-generated overview

Read-only Bitcoin market and network data from 21btc.cc: price, ETF flows, holders, fees, derivatives, models and site search.

What you can do
  • Get live BTC price in USD and seven other currencies, plus US spot ETF flows and holder data for companies, funds and governments.
  • Read network stats, recommended transaction fees, realised volatility and a risk on/off score.
  • Inspect rainbow and stock-to-flow model values, and perpetual futures open interest, funding rates and liquidations.
  • Search the site's glossary, wiki, blog, videos, pools, wallets and hacks, and list upcoming Bitcoin conferences and site changelog entries.
When to use it
Useful when an assistant needs current Bitcoin market, on-chain or derivatives figures with cited sources, or quick definitions and event listings, without building its own data pipeline.
Requirements
Remote streamable HTTP endpoint at 21btc.cc; no authentication, API key or environment variables declared. Rate limit of 60 requests per minute per IP.
Before you install
Results include an attribution object and the server asks that its citation markdown be shown with figures; models are explicitly not forecasts and nothing is investment advice. Liquidations cover only one exchange, and holder counts are addresses, not people.

Installation

In SourceWeft

  1. Open 21btc.cc Bitcoin Data in the dashboard and add it to a workspace.
  2. Enable the server for the chats that should use its tools.

Web executable via Streamable HTTP. Remote servers run from the web runtime once configured in a workspace.

Use with an agent

Paste this prompt into Claude Code, Codex, Cursor or another agent — or into SourceWeft chat. The agent reads this server's install guide, shows you its publisher, endpoint and sign-in, and adds it to your client once you agree. Keys never go into a command.

Read https://sourceweft.com/mcp/cc.21btc%2Fbitcoin-data/install.md and connect the MCP server it describes to my client. Before changing any config, show me its publisher, endpoint and sign-in method and wait for my OK. Never put an API key in a command or in a file I would commit; ask me where it should come from.

Read the install guide the agent follows

Other MCP clients

Add this to your client's mcpServers config.

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

Tools

14

get_price

Bitcoin price

Live BTC price in USD and 7 other currencies (official FX reference rates). Same data as GET /api/v1/price. Read-only.

Takes no parameters.

get_etf_flows

Spot Bitcoin 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.

Takes no parameters.

get_risk_score

Risk On/Off score

Risk On/Off composite score (0–100) with every input, formula and source. Same data as GET /api/v1/risk. Read-only.

Takes no parameters.

get_volatility

Bitcoin volatility

Annualised realised volatility over 7/30/90/365 days and by year. Same data as GET /api/v1/volatility. Read-only.

Takes no parameters.

get_holders

Bitcoin holders: companies, funds, governments

Bitcoin holders: companies, funds, governments (BTC, 7-day change). Same data as GET /api/v1/holders. Read-only.

Takes no parameters.

get_rainbow_model

Rainbow model (a model, not a forecast)

Rainbow model fit parameters and today's deviation (a model, not a forecast). Same data as GET /api/v1/rainbow. Read-only.

Takes no parameters.

get_stock_to_flow

Stock-to-flow model (a model, not a forecast)

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.

Takes no parameters.

get_network_stats

Bitcoin 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.

Takes no parameters.

get_fees

Bitcoin transaction fees

Recommended Bitcoin transaction fees in sat/vB (fastest, 30 minutes, 1 hour, economy, minimum) and mempool size, from mempool.space. Read-only.

Takes no parameters.

get_derivatives

Bitcoin derivatives: open interest, funding, liquidations

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.

Takes no parameters.

get_holder_distribution

Bitcoin addresses by balance (shrimp to humpback)

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.

Takes no parameters.

search_site

Search 21btc.cc (pages, glossary, wiki, blog)

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.

Parameterskindlimitqueryrequiredlanguage

get_events

Upcoming Bitcoin conferences and 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.

Parameterslimitcountry

get_changelog

Site changelog

Recent shipped changes to 21btc.cc with dates and links. Same data as the /changelog page and its RSS feed. Read-only.

Parameterslimit

Version history

1
  1. v1.1.0LatestOct 29, 2026

Score

83% of the applicable checks met

How complete this listing is, computed from the registry entry, the endpoint and public sources. Not a rating of the server and not a statement that it is safe or working today: reachability is a dated check, and no installs or reviews go into the score.

  • Reached in the last 30 daysRequired25 pts
  • Auth declaredRequired10 pts
  • Tools listedRequired15 pts
  • DescriptionRequired15 pts
  • Logo10 pts
  • Documentation15 pts

    Declare a GitHub repository with a README, or serve resource_documentation in the OAuth protected-resource metadata.

  • LicenseNot applicable

    A hosted service is used under its provider's terms, so no license is expected here. This check is left out of the percentage.