bitflyer-mcp

Read-only MCP server for bitFlyer public market data. Lets Claude (Desktop / Code) and other MCP clients query bitFlyer's ticker, order book, recent executions, and exchange health in natural language.

Safe by design: this server uses only bitFlyer's public REST API — no API key, no authentication, no access to any account, balance, position, or order. It cannot place, cancel, or read trades. Worst case for anyone running it is a read of public market data.

⚠️ Not investment advice. This is an information tool. Trading crypto carries risk.

Tools

product_code examples: FX_BTC_JPY (BTC margin, default), BTC_JPY (spot), ETH_JPY, XRP_JPY.

Install

# from PyPI is not published yet — install from source
git clone https://github.com/TakuroidX/bitflyer-mcp.git
cd bitflyer-mcp
pip install -e .

Requires Python ≥ 3.10. Dependencies: mcp, httpx.

Use with Claude Desktop

Add to claude_desktop_config.json (macOS: ~/Library/Application Support/Claude/):

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

Then ask Claude things like "What's the current FX_BTC_JPY price and spread on bitFlyer?"

Use with Claude Code

claude mcp add bitflyer -- bitflyer-mcp

Example

> bitFlyer の FX_BTC_JPY、今いくら？板の厚さは？
get_ticker → ltp ¥10,210,000 / best_bid ¥10,209,500 / best_ask ¥10,210,500
get_board  → mid ¥10,210,000 / spread ¥1,000 / 上位10段...

Design notes

• Public-only / read-only — the safest possible surface. No credentials are read or stored.

• Rate-limit aware — a minimum request interval keeps usage under bitFlyer's public per-IP limit (~500 req / 5 min).

• Board summarization — the raw board has hundreds of levels; get_board returns the top-N to stay LLM-context-friendly.

• bitFlyer has no native OHLC/candle endpoint, so this server does not fabricate one.

Development

pip install -e ".[dev]" pytest pytest-asyncio
pytest

License

MIT © TakuroidX