# 21btc.cc Bitcoin Data

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

- name: cc.21btc/bitcoin-data
- version: 1.1.0
- connection class: R0 (autonomous)
- trust: 83/100 flags: no-repository
- quality: 100/100 (strong)
- owner: not claimed
- descriptor: https://api.protogrid.dev/v1/servers/cc.21btc%2Fbitcoin-data
- tools: https://api.protogrid.dev/v1/servers/cc.21btc%2Fbitcoin-data/tools

**An agent can connect right now, no human step.** Remote endpoint, no authentication, reachable on the last probe.

## Connection (mcpServers)

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


## Trust

- hygiene: 80
- liveness: 100
- freshness: 100
- provenance: 55
- drivers: +dns-namespace +website +reachable +uptime-100% +updated-17d-ago -no-repository
- Derived from observable signals (official registry feed and our own credential-free probes); no code audit performed.

## Quality 100/100 (strong)

### protocol: 100 (weight 25)

- pass `protocol.modern`: supports 2026-07-28 (server/discover)
- pass `protocol.stateless`: answers without a session
- pass `protocol.transport`: streamable HTTP
- pass `protocol.list_ttl`: tool list is cacheable (ttlMs 3600000)

### authorization: n/a (weight 15)

- n/a `auth.prm`, `auth.as_metadata`, `auth.cimd`: no remote uses OAuth
- n/a `auth.secret_in_url`: no templated URL

### tool hygiene: 100 (weight 30)

- pass `tools.descriptions`: every tool has a description
- pass `tools.description_length`: descriptions are concise
- pass `tools.schemas`: every tool has an object input schema
- pass `tools.annotations`: 14 of 14 tools declare readOnlyHint or destructiveHint
- pass `tools.directory_hints`: every tool declares readOnlyHint, destructiveHint, idempotentHint and openWorldHint
- pass `tools.token_cost`: about 1,449 tokens to load every tool
- pass `tools.api_dump`: tools are not a one-to-one API dump
- pass `tools.hidden_text`: no hidden text in tool names, descriptions, schemas or annotations

### stability: 100 (weight 15)

- pass `stability.changes`: no tool changes in 30 days
- pass `stability.rug_pull`: no tool changed its meaning under the same name
- pass `stability.new_links`: no tool change named a new site

### dependencies: n/a (weight 15)

- n/a `deps.known_vulns`, `deps.mcp_sdk_version`, `deps.resolvable`: no npm or PyPI package

- tools: 14, about 1,449 tokens to load them all
- tool set hash: a018c6603334f10109ca5e8576416c8b
- badge: [![protogrid quality](https://protogrid.dev/badge/cc.21btc/bitcoin-data.svg)](https://protogrid.dev/servers/cc.21btc/bitcoin-data)
- Checks run on what our credential-free, read-only probes observe; tools are never called and no code audit is performed.

### Tool changes

_No tool definition changes recorded._

## Remotes

- https://21btc.cc/mcp (streamable-http, auth none, reachable true, uptime30d 1)

## Packages

_none_

## Tools (14)

- `get_changelog`: Recent shipped changes to 21btc.cc with dates and links. Same data as the /changelog page and its RSS feed. Read-only.
- `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.
- `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.
- `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.
- `get_fees`: Recommended Bitcoin transaction fees in sat/vB (fastest, 30 minutes, 1 hour, economy, minimum) and mempool size, from mempool.space. Read-only.
- `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.
- `get_holders`: Bitcoin holders: companies, funds, governments (BTC, 7-day change). Same data as GET /api/v1/holders. Read-only.
- `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.
- `get_price`: Live BTC price in USD and 7 other currencies (official FX reference rates). Same data as GET /api/v1/price. Read-only.
- `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.
- `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.
- `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.
- `get_volatility`: Annualised realised volatility over 7/30/90/365 days and by year. Same data as GET /api/v1/volatility. Read-only.
- `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.