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.

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

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" }
}

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

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" }
  }
}

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.

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

pip install -e ".[dev]"
pytest

Apache 2.0 — see LICENSE.