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21btc.cc Bitcoin Data

cc.21btc/bitcoin-data21btc.ccstreamable-httpv1.1.0Scanned

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

14 tools: 14 only read.

Tools: 0 delete, 0 irreversible, 0 write, 14 read.
  • Reads private data · 0
  • Reads text others write · 12
  • Can send data out · 0
  • No findings

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Tools

Grouped by what each tool does, most consequential first. Open one for its reasons and full description; descriptions are the publisher's own words.

14 tools

Only reads 14Show 14 read-only tools
  • get_changelogRecent shipped changes to 21btc.cc with dates and links.No findings

    Why it is in this group

    • The name "get_changelog" says "get": a word for reading.
    Description, as the server wrote it
    Recent shipped changes to 21btc.cc with dates and links. Same data as the /changelog page and its RSS feed. Read-only.

    Annotations the server declares

    • title: Site changelog
    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: false
  • 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 …Reads text others writeNo findings

    Why it is in this group

    • The name "get_derivatives" says "get": a word for reading.

    What it can reach

    • untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
    Description, as the server wrote it
    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.

    Annotations the server declares

    • title: Bitcoin derivatives
    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: true
  • get_etf_flowsUS spot Bitcoin ETFs: BTC held, fee, latest/5d/20d/cumulative flows (USD millions).Reads text others writeNo findings

    Why it is in this group

    • The name "get_etf_flows" says "get": a word for reading.

    What it can reach

    • untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
    Description, as the server wrote it
    US spot Bitcoin ETFs: BTC held, fee, latest/5d/20d/cumulative flows (USD millions). Same data as GET /api/v1/etf. Read-only.

    Annotations the server declares

    • title: Spot Bitcoin ETF flows
    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: true
  • 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.Reads text others writeNo findings

    Why it is in this group

    • The name "get_events" says "get": a word for reading.

    What it can reach

    • untrusted-inputThe description's first sentence says "url": it reads web pages, which anyone can write.
    Description, as the server wrote it
    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.

    Annotations the server declares

    • title: Bitcoin events
    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: false
  • get_feesRecommended Bitcoin transaction fees in sat/vB (fastest, 30 minutes, 1 hour, economy, minimum) and mempool size, from mempool.space.Reads text others writeNo findings

    Why it is in this group

    • The name "get_fees" says "get": a word for reading.

    What it can reach

    • untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
    Description, as the server wrote it
    Recommended Bitcoin transaction fees in sat/vB (fastest, 30 minutes, 1 hour, economy, minimum) and mempool size, from mempool.space. Read-only.

    Annotations the server declares

    • title: Bitcoin transaction fees
    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: true
  • 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.No findings

    Why it is in this group

    • The name "get_holder_distribution" says "get": a word for reading.
    Description, as the server wrote it
    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.

    Annotations the server declares

    • title: Bitcoin address distribution
    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: false
  • get_holdersBitcoin holders: companies, funds, governments (BTC, 7-day change).Reads text others writeNo findings

    Why it is in this group

    • The name "get_holders" says "get": a word for reading.

    What it can reach

    • untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
    Description, as the server wrote it
    Bitcoin holders: companies, funds, governments (BTC, 7-day change). Same data as GET /api/v1/holders. Read-only.

    Annotations the server declares

    • title: Bitcoin holders: companies, funds, governments
    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: true
  • get_network_statsBitcoin network now: block height, hashrate (EH/s), difficulty and the next difficulty adjustment, mempool size, average block time, halving countdown.Reads text others writeNo findings

    Why it is in this group

    • The name "get_network_stats" says "get": a word for reading.

    What it can reach

    • untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
    Description, as the server wrote it
    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.

    Annotations the server declares

    • title: Bitcoin network stats
    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: true
  • get_priceLive BTC price in USD and 7 other currencies (official FX reference rates).Reads text others writeNo findings

    Why it is in this group

    • The name "get_price" says "get": a word for reading.

    What it can reach

    • untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
    Description, as the server wrote it
    Live BTC price in USD and 7 other currencies (official FX reference rates). Same data as GET /api/v1/price. Read-only.

    Annotations the server declares

    • title: Bitcoin price
    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: true
  • get_rainbow_modelRainbow model fit parameters and today's deviation (a model, not a forecast).Reads text others writeNo findings

    Why it is in this group

    • The name "get_rainbow_model" says "get": a word for reading.

    What it can reach

    • untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
    Description, as the server wrote it
    Rainbow model fit parameters and today's deviation (a model, not a forecast). Same data as GET /api/v1/rainbow. Read-only.

    Annotations the server declares

    • title: Rainbow model (a model, not a forecast)
    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: true
  • get_risk_scoreRisk On/Off composite score (0–100) with every input, formula and source.Reads text others writeNo findings

    Why it is in this group

    • The name "get_risk_score" says "get": a word for reading.

    What it can reach

    • untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
    Description, as the server wrote it
    Risk On/Off composite score (0–100) with every input, formula and source. Same data as GET /api/v1/risk. Read-only.

    Annotations the server declares

    • title: Risk On/Off score
    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: true
  • get_stock_to_flowStock-to-flow ratio and PlanB 2019 model value (a model, not a forecast).Reads text others writeNo findings

    Why it is in this group

    • The name "get_stock_to_flow" says "get": a word for reading.

    What it can reach

    • untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
    Description, as the server wrote it
    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.

    Annotations the server declares

    • title: Stock-to-flow model (a model, not a forecast)
    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: true
  • get_volatilityAnnualised realised volatility over 7/30/90/365 days and by year.Reads text others writeNo findings

    Why it is in this group

    • The name "get_volatility" says "get": a word for reading.

    What it can reach

    • untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
    Description, as the server wrote it
    Annualised realised volatility over 7/30/90/365 days and by year. Same data as GET /api/v1/volatility. Read-only.

    Annotations the server declares

    • title: Bitcoin volatility
    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: true
  • search_siteSearch the site's pages, Bitcoin glossary terms, wiki articles, blog posts, videos, pools, wallets and hacks.Reads text others writeNo findings

    Why it is in this group

    • The name "search_site" says "search": a word for reading.

    What it can reach

    • untrusted-inputThe description's first sentence says "search" and "post": it reads posts, which other people can write.
    Description, as the server wrote it
    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.

    Annotations the server declares

    • title: Search 21btc.cc
    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: false

This is not a safety rating, and no finding is not a safety guarantee. The groups and findings come from fixed checks of the tool definitions the server returned on the date shown, not from its code or what it does when called. How the checks work.

Exfil surface

Which tools read private data, which read text someone else can write, and which can send data out. One of each is a path a prompt injection can use.

No private-data, untrusted-input, outbound path in this server alone: no tool is tagged private-data or outbound.

Reads private data0
Reads files, mail, messages, databases, secrets, calendars or repositories.
Reads text others write12
Brings in text someone else can write: web pages, inbound email, messages, issues and comments.
Can send data out0
Can carry data to people or systems: it sends, posts or publishes, or takes a recipient, channel or URL.

Other servers in the same agent add their own tools to these paths. Audit your whole setup to see them together.

Findings

Matches of fixed checks, with the text they matched.

No check matched anything in these tool definitions. That is not a safety guarantee.

History

Changes to its tool definitions and to its remote endpoint, newest first.

No change seen yet. Its tools are rescanned every day, and a remote endpoint is looked at once a week.

All changes to this server

Install

Pinned to version 1.1.0. Values in angle brackets are yours to fill in.

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

Run in a terminal.

Claude Code permissions

Allow the reads, ask before a change or a way out, deny the deletes. Paste into .claude/settings.json.

.claude/settings.json
{
  "permissions": {
    "allow": [
      "mcp__bitcoin-data__get_price",
      "mcp__bitcoin-data__get_etf_flows",
      "mcp__bitcoin-data__get_risk_score",
      "mcp__bitcoin-data__get_volatility",
      "mcp__bitcoin-data__get_holders",
      "mcp__bitcoin-data__get_rainbow_model",
      "mcp__bitcoin-data__get_stock_to_flow",
      "mcp__bitcoin-data__get_network_stats",
      "mcp__bitcoin-data__get_fees",
      "mcp__bitcoin-data__get_derivatives",
      "mcp__bitcoin-data__get_holder_distribution",
      "mcp__bitcoin-data__search_site",
      "mcp__bitcoin-data__get_events",
      "mcp__bitcoin-data__get_changelog"
    ],
    "ask": [],
    "deny": []
  }
}

Tools that only read are allowed, tools that change things ask first, tools that delete or cancel are denied. A read that can send data out (it takes a URL, say) asks first too. It assumes the server is installed as bitcoin-data. Review it before you use it.

Capability tags behind 12 rules
  • mcp__bitcoin-data__get_price untrusted-input
  • mcp__bitcoin-data__get_etf_flows untrusted-input
  • mcp__bitcoin-data__get_risk_score untrusted-input
  • mcp__bitcoin-data__get_volatility untrusted-input
  • mcp__bitcoin-data__get_holders untrusted-input
  • mcp__bitcoin-data__get_rainbow_model untrusted-input
  • mcp__bitcoin-data__get_stock_to_flow untrusted-input
  • mcp__bitcoin-data__get_network_stats untrusted-input
  • mcp__bitcoin-data__get_fees untrusted-input
  • mcp__bitcoin-data__get_derivatives untrusted-input
  • mcp__bitcoin-data__search_site untrusted-input
  • mcp__bitcoin-data__get_events untrusted-input

Pin

Keep the decision: fail CI when the tools change, follow every change, or show a badge.

Pin in CI

Fail a build when the tools you reviewed are not the tools the server serves today.

curl -s "https://anlyon.dev/api/v1/servers/cc.21btc/bitcoin-data/verify?hash=90242acc7af007ab9849f24ab1368cd4b713e2a96391369452ee9556bb3787d9" | jq -e '.changed == false'

Pinned hash 90242acc7af0, from Oct 28, 2026, 15:17 UTC.

Watch

Get told when its tools change: a new tool, a new description, a new class.

https://anlyon.dev/servers/cc.21btc/bitcoin-data/changes.xml

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Badge

anlyon.dev badge for cc.21btc/bitcoin-data
[![anlyon.dev](https://anlyon.dev/badge/cc.21btc/bitcoin-data.svg)](https://anlyon.dev/servers/cc.21btc/bitcoin-data)

Source: MCP Registry. Synced Oct 28, 2026, 15:17 UTC.