21btc.cc Bitcoin Data
Live Bitcoin price, ETF flows, treasuries, on-chain metrics, fees, derivatives & wiki search.
Should I use this
Quality & Safety
Findings (2)
- HIGHTool poisoning patterns detected
- INFOTool description contains placeholder or incomplete textin search_site
Based on automated analysis of tool definitions and protocol compliance.
Context Cost
This is the approximate number of tokens consumed each time the server's tools are loaded into a model's context. Higher counts reduce the attention available for other tasks.
Install
One-Click Install
Add this to your `claude_desktop_config.json` file:
{
"mcpServers": {
"bitcoin-data": {
"url": "https://21btc.cc/mcp"
}
}
}Remote endpoints
https://21btc.cc/mcpstreamable-httpWhat it can do
Tool inventory
Tools (14)
🟢get_price
Live BTC price in USD and 7 other currencies (official FX reference rates). Same data as GET /api/v1/price. Read-only.
Input Schema
{
"type": "object",
"properties": {},
"additionalProperties": false
}🟢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.
Input Schema
{
"type": "object",
"properties": {},
"additionalProperties": false
}🟢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.
Input Schema
{
"type": "object",
"properties": {},
"additionalProperties": false
}🟢get_volatility
Annualised realised volatility over 7/30/90/365 days and by year. Same data as GET /api/v1/volatility. Read-only.
Input Schema
{
"type": "object",
"properties": {},
"additionalProperties": false
}🟢get_holders
Bitcoin holders: companies, funds, governments (BTC, 7-day change). Same data as GET /api/v1/holders. Read-only.
Input Schema
{
"type": "object",
"properties": {},
"additionalProperties": false
}🟢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.
Input Schema
{
"type": "object",
"properties": {},
"additionalProperties": false
}🟢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.
Input Schema
{
"type": "object",
"properties": {},
"additionalProperties": false
}🟢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.
Input Schema
{
"type": "object",
"properties": {},
"additionalProperties": false
}🟢get_fees
Recommended Bitcoin transaction fees in sat/vB (fastest, 30 minutes, 1 hour, economy, minimum) and mempool size, from mempool.space. Read-only.
Input Schema
{
"type": "object",
"properties": {},
"additionalProperties": false
}🟢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.
Input Schema
{
"type": "object",
"properties": {},
"additionalProperties": false
}🟢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.
Input Schema
{
"type": "object",
"properties": {},
"additionalProperties": false
}🟢search_site(query, kind, limit, language)
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.
Input Schema
{
"type": "object",
"properties": {
"query": {
"type": "string",
"description": "Words to look for, English or Russian",
"maxLength": 200
},
"kind": {
"type": "string",
"enum": [
"section",
"blog",
"glossary",
"wiki",
"video",
"pool",
"wallet",
"museum",
"hack"
],
"description": "Limit to one kind of result"
},
"limit": {
"type": "integer",
"minimum": 1,
"maximum": 20,
"default": 8
},
"language": {
"type": "string",
"enum": [
"en",
"ru"
],
"default": "en",
"description": "Language of titles and summaries"
}
},
"required": [
"query"
],
"additionalProperties": false
}🟢get_events(limit, country)
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.
Input Schema
{
"type": "object",
"properties": {
"limit": {
"type": "integer",
"minimum": 1,
"maximum": 40,
"default": 15
},
"country": {
"type": "string",
"description": "Filter by country name in English, e.g. Switzerland",
"maxLength": 60
}
},
"additionalProperties": false
}🟢get_changelog(limit)
Recent shipped changes to 21btc.cc with dates and links. Same data as the /changelog page and its RSS feed. Read-only.
Input Schema
{
"type": "object",
"properties": {
"limit": {
"type": "integer",
"minimum": 1,
"maximum": 50,
"default": 10
}
},
"additionalProperties": false
}Community
Evidence