# 21btc.cc Bitcoin Data (remote · 21btc.cc)

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

- Trust score: 75/100 (medium)
- Change this week: +3
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-11-05

## Components

- remote · `21btc.cc`: 75/100 (this document), [markdown](https://verifymcp.io/servers/cc-21btc-bitcoin-data/21btc.md), [page](https://verifymcp.io/servers/cc-21btc-bitcoin-data/21btc)

## Channel facts

- Endpoint: `https://21btc.cc/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `1.1.0`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-11-05.

- **Endpoint Security**: 80/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - No authorisation is required to call this server. Every tool declares its destructiveHint and none is destructive, so open access doesn't expose one.
  - HTTPS is enforced; there's no plaintext access path.
  - The HSTS (Strict-Transport-Security) header is present.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 69/100
  - AI-judged instruction clarity (good).
  - Tool/resource definitions use about 954 tokens (~68/item across 14 items; 14 tools + 0 resources), lean.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 27/100
  - Stability observed for 8 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 86/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 57% of tool parameters carry a description.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 14 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 15 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a current MCP spec version (2026-07-28).

## Install

### How do I install the 21btc.cc Bitcoin Data MCP server?

21btc.cc Bitcoin Data is a hosted endpoint at https://21btc.cc/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

### Claude

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

### Cursor

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

### VS Code

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

### Codex

```toml
[mcp_servers.cc-21btc-bitcoin-data]
url = "https://21btc.cc/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "cc-21btc-bitcoin-data": {
      "type": "remote",
      "url": "https://21btc.cc/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add cc-21btc-bitcoin-data --url 'https://21btc.cc/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  cc-21btc-bitcoin-data:
    url: "https://21btc.cc/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "cc-21btc-bitcoin-data": {
      "Transport": "http",
      "Url": "https://21btc.cc/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add cc-21btc-bitcoin-data -t streamable-http -u 'https://21btc.cc/mcp'
```

### Other

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

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-11-04 (score 75, +1)

No change was recorded against any check on this day. Stability & Change Management went from 20 to 23. That category is still filling its 30-day observation window: 6 days of observed history at the previous scan, 7 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-11-02 (score 74, +1)

No change was recorded against any check on this day. Stability & Change Management went from 13 to 17. That category is still filling its 30-day observation window: 4 days of observed history at the previous scan, 5 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-31 (score 73, +1)

No change was recorded against any check on this day. Stability & Change Management went from 7 to 10. That category is still filling its 30-day observation window: 2 days of observed history at the previous scan, 3 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-29 (score 72, +1)

- [functional improvement] Stability: unverified → 0.03

### 2026-10-28 (score 71)

First indexed and scored.

## MCP tools (14)

### `get_price` (~38 tokens)

Bitcoin price

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

### `get_etf_flows` (~50 tokens)

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.

### `get_risk_score` (~43 tokens)

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.

### `get_volatility` (~42 tokens)

Bitcoin volatility

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

### `get_holders` (~39 tokens)

Bitcoin holders: companies, funds, governments

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

### `get_rainbow_model` (~41 tokens)

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.

### `get_stock_to_flow` (~46 tokens)

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.

### `get_network_stats` (~57 tokens)

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.

### `get_fees` (~46 tokens)

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.

### `get_derivatives` (~89 tokens)

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.

### `get_holder_distribution` (~73 tokens)

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.

### `search_site` (~106 tokens)

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.

Input parameters:

- `kind` (string): Limit to one kind of result
- `language` (string): Language of titles and summaries
- `limit` (integer)
- `query` (string, required): Words to look for, English or Russian

### `get_events` (~80 tokens)

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.

Input parameters:

- `country` (string): Filter by country name in English, e.g. Switzerland
- `limit` (integer)

### `get_changelog` (~45 tokens)

Site changelog

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

Input parameters:

- `limit` (integer)

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/cc-21btc-bitcoin-data/21btc#diagnostics

## Score history

- 2026-11-05: 75
- 2026-11-04: 75
- 2026-11-03: 74
- 2026-11-02: 74
- 2026-11-01: 73
- 2026-10-31: 73
- 2026-10-30: 72
- 2026-10-29: 72
- 2026-10-28: 71

## Common questions

### What is the 21btc.cc Bitcoin Data MCP server?

21btc.cc Bitcoin Data is an MCP server listed in the public MCP registry as cc.21btc/bitcoin-data. Live Bitcoin price, ETF flows, treasuries, on-chain metrics, fees, derivatives & wiki search. This page covers its hosted endpoint (https://21btc.cc/mcp).

### Is the 21btc.cc Bitcoin Data MCP server safe to use?

21btc.cc Bitcoin Data scores 75 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.

### What tools does the 21btc.cc Bitcoin Data MCP server expose?

21btc.cc Bitcoin Data exposes 14 tools: get_price, get_etf_flows, get_risk_score, get_volatility, get_holders, and 9 more. Their descriptions and schemas cost roughly 795 tokens of context every time the server is loaded.

### Does the 21btc.cc Bitcoin Data MCP server require authentication?

No. We connected to 21btc.cc Bitcoin Data without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.

### Is the 21btc.cc Bitcoin Data MCP server still maintained?

21btc.cc Bitcoin Data is still listed as active in the MCP registry. We last reached this channel on 5 November 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

## Links

- Remote endpoint: https://21btc.cc/mcp
- Website: https://21btc.cc/mcp
- Changelog RSS feed: https://verifymcp.io/servers/cc-21btc-bitcoin-data/21btc.xml
- Changelog JSON feed: https://verifymcp.io/servers/cc-21btc-bitcoin-data/21btc.json
- HTML version of this page: https://verifymcp.io/servers/cc-21btc-bitcoin-data/21btc