# 21 BTC (21btc.cc)

Dashboard aggregating bitcoin price, spot ETF flows, treasury holdings and on-chain network data, each figure with its source.

- Atlas card: https://inite.ai/en/atlas/21btc.cc
- Site: https://21btc.cc
- For: Bitcoin investors and researchers tracking prices, ETF flows, treasuries and on-chain network data
- Categories: analytics
- Use not measured/100 · alive 100/100

## Used for

- check daily spot bitcoin ETF flows by fund
- track which companies and governments hold bitcoin
- screen a bitcoin address against the OFAC sanctions list

## Price

Not read yet.

## For developers

- MCP server: cc.21btc/bitcoin-data (namespace; open on 2026-10-29, 14 tools)
- MCP server card: https://21btc.cc/.well-known/mcp.json
- Read 2026-10-29

## MCP server, measured daily

Server: https://21btc.cc/mcp, checked every day since 2026-10-29 (4 checks).

- Answered: measuring, 4 daily checks so far
- Median first answer: 478 ms
- Sign-in: none
- Context its tool definitions take: about 1175 tokens (14 tools)
- Tool definitions: A, 96/100
- Failing "params_described": 3 of 14 tools
- Method: https://inite.ai/en/atlas/mcp/report

## Your data

- Certifications stated: none
- Read 2026-10-29

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Source: INITE Atlas, https://inite.ai/en/atlas/21btc.cc. JSON: https://inite.ai/api/atlas/21btc.cc. MCP: https://inite.ai/api/mcp (atlas_lookup).