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Bad fee timing burns sats on every Bitcoin transaction. Satoshi API tells you when to send, what to pay, and whether to wait — combining multiple estimatesmartfee targets with real-time mempool state. Instead of just "4 sat/vB", you get "Fees are low. Good time to send." One pip install, self-hostable, open source.

Install & Run

pip install satoshi-api
export BITCOIN_RPC_USER=your_user BITCOIN_RPC_PASSWORD=your_password
satoshi-api
# API:  http://localhost:9332
# Docs: http://localhost:9332/docs

Example

curl http://localhost:9332/api/v1/fees/recommended | jq

{
  "data": {
    "recommendation": "Fees are low. Good time to send.",
    "estimates": { "high": 4, "medium": 2, "low": 1 }
  },
  "meta": { "timestamp": "...", "node_height": 939462, "chain": "main" }
}

Core Endpoints

Category	Example paths	Highlights
Fees	/api/v1/fees/recommended, /api/v1/fees/plan	Recommendations, landscape ("send now or wait?"), history, mempool-blocks
Transactions	/api/v1/tx/{txid}, /api/v1/broadcast	Decoded analysis, status, outspends, UTXO lookup, broadcast
Mempool	/api/v1/mempool, /api/v1/mempool/recent	Congestion score, fee buckets, recent entries
Blocks	/api/v1/blocks/latest, /api/v1/blocks/{height_or_hash}	Latest block, by height/hash, stats, txids, header
Mining	/api/v1/mining, /api/v1/mining/nextblock	Hashrate, difficulty, next block template
Network	/api/v1/network, /api/v1/network/difficulty	Peers, forks, difficulty, address validation
Streams	/api/v1/stream/blocks, /api/v1/stream/fees	Real-time blocks & fees via SSE

...and more (prices, address lookups, exchange comparison). Full interactive docs at /docs.

For AI Agents

bitcoin-mcp — the first Bitcoin MCP server on the official Anthropic MCP Registry — lets AI agents check fees, verify payments, and monitor addresses without human babysitting. Saves developer time: no custom Bitcoin plumbing needed.

# Install and point at your Satoshi API instance
pip install bitcoin-mcp
SATOSHI_API_URL=https://bitcoinsapi.com bitcoin-mcp

Or connect to a local node directly:

{
  "mcpServers": {
    "bitcoin": { "command": "bitcoin-mcp" }
  }
}

For repo-native agent instructions, use docs/AGENT_INTEGRATION.md. It includes copy-paste snippets for AGENTS.md, CLAUDE.md, .github/copilot-instructions.md, Cursor/Windsurf rules, MCP config, and x402 paid calls.

For keyless premium calls, start at bitcoinsapi.com/x402/start. The paid flow is: discover /.well-known/x402, request a paid /api/v1 endpoint, read PAYMENT-REQUIRED, then retry with PAYMENT-SIGNATURE.

Self-Hosting

pip install satoshi-api
satoshi-api  # runs on :9332

# Expose publicly (free HTTPS + DDoS protection)
cloudflared tunnel --url http://localhost:9332

See self-hosting guide for full production setup.

Contributing

Issues and PRs welcome. Run the test suite before submitting:

pip install -e ".[dev]"
pytest

Roadmap

See docs/ROADMAP.md for the 12-month development plan — indexer expansion, multi-network support, fee prediction, SDKs, and more.

Support This Project

Satoshi API is free, open-source Bitcoin infrastructure. If you find it useful, consider supporting development through OpenSats.

Related Projects

• bitcoin-mcp — MCP server with 49 Bitcoin tools for AI agents
• ChainPulse — AI-powered Bitcoin network intelligence CLI
• BAIP-1 — Bitcoin Agent Identity Protocol

License

Apache 2.0 — see LICENSE.

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