QAmcp

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Directory / 21btc.cc Bitcoin Data

21btc.cc Bitcoin Data

Q: Is 21btc.cc Bitcoin Data MCP server safe?

QAmcp's test on 28 Oct 2026: No hidden instructions were found in its tool descriptions. Its error messages showed no secrets or internal details. All 14 of its tools are labeled read-only. Overall it scored 88/100 on 28 Oct 2026. A test can only see what the server shows from outside, not what it does with your data behind the scenes. Connect servers from makers you trust.

by 21btc.cc · https://21btc.cc/mcp

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

14 tools✓ all read-only✓ no account neededPricing: on their site

See pricing →Visit website

88 /100

PASS · WITH NOTES

11 of 11 checks · 28 Oct 2026

Is 21btc.cc Bitcoin Data MCP server safe?

No hidden instructions were found in its tool descriptions.
Its error messages showed no secrets or internal details.
All 14 of its tools are labeled read-only.
Overall it scored 88/100 on 28 Oct 2026.

A test can only see what the server shows from outside, not what it does with your data behind the scenes. Connect servers from makers you trust.

What it can do

14 tools, in the server's own words.

get_priceread-only

Live BTC price in USD and 7 other currencies (official FX reference rates).

get_etf_flowsread-only

US spot Bitcoin ETFs: BTC held, fee, latest/5d/20d/cumulative flows (USD millions).

get_risk_scoreread-only

Risk On/Off composite score (0–100) with every input, formula and source.

get_volatilityread-only

Annualised realised volatility over 7/30/90/365 days and by year.

get_holdersread-only

Bitcoin holders: companies, funds, governments (BTC, 7-day change).

get_rainbow_modelread-only

Rainbow model fit parameters and today's deviation (a model, not a forecast).

get_stock_to_flowread-only

Stock-to-flow ratio and PlanB 2019 model value (a model, not a forecast).

get_network_statsread-only

Bitcoin network now: block height, hashrate (EH/s), difficulty and the next difficulty adjustment, mempool size, average block time, halving countdown.

get_feesread-only

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

get_derivativesread-only

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 o…

get_holder_distributionread-only

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.

search_siteread-only

Search the site's pages, Bitcoin glossary terms, wiki articles, blog posts, videos, pools, wallets and hacks.

get_eventsread-only

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 whe…

get_changelogread-only

Recent shipped changes to 21btc.cc with dates and links.

Test results

Safe mode: only tools labeled read-only were run. How the test works

!
Every tool is described
3 warnings
- !search_site: Inputs with no description: limit
- !get_events: Inputs with no description: limit
- !get_changelog: Inputs with no description: limit
note
!
Tools work with good inputs
1 warning
- !get_holders: Answered with about 112 KB of text. Many AI apps cut off tool answers this big, so the AI may never see the end of it.
- and 13 more
note
✓
ConnectsConnected in 422 ms
pass
✓
Ready for the newest MCP versionUses the latest MCP version (2026-07-28)
pass
✓
Lists its toolsFound 14 tools
pass
✓
Tools are labeled safe or dangerousEvery tool has a safety label
pass
✓
No hidden instructionsNo hidden instructions found in tool descriptions
pass
✓
Bad inputs give a clean error
All good
- ✓search_site: Refused missing required input "query" with a clear error
- ✓search_site: Refused wrong type for "query" with a clear error
- ✓get_events: Refused wrong type for "country" with a clear error
- ✓get_changelog: Refused wrong type for "limit" with a clear error
pass
✓
Fast enough
All good
- ✓Connecting took 422 ms
- ✓Listing tools took 121 ms
- ✓Average tool answer: 194 ms
- ✓get_holders: Slowest tool: get_holders (457 ms)
pass
✓
No secrets leakedChecked 4 error messages: no secrets or internal details
pass
✓
Follows MCP best practices (not scored yet)Tool names, safety labels and tool list size follow the MCP guide
pass
–
Tools work togetherNo tool's answer could be fed into another tool, so there were no chains to test (not counted either way)
not tested

Test it yourself

Free and open source. Same checks, same score.

npx qamcp-cli https://21btc.cc/mcp

Show this score on GitHub

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[![QAmcp score](https://qamcp.dev/s/cc-21btc-bitcoin-data.svg)](https://qamcp.dev/s/cc-21btc-bitcoin-data.html)

Score over time

28 Oct 202688

One test so far. New tests will show here.

Reviews

Coming soon: reviews from people who use 21btc.cc Bitcoin Data, signed in with GitHub, one per person. Reviews never change the score.

Is this your server? Get an alert the moment it breaks.

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