Nephyr Backtest MCP Server: Install & Setup

Install Nephyr Backtest in Claude Code

Claude Code

claude mcp add nephyr-backtest -- uvx nephyr-backtest

mcp.json (Claude Desktop, Cursor, VS Code, Windsurf)

{
  "mcpServers": {
    "nephyr-backtest": {
      "command": "uvx",
      "args": [
        "nephyr-backtest"
      ]
    }
  }
}

Prediction market strategy backtesting with real on-chain Polymarket data

Yes, most likely. Open source and no paid account or API key is mentioned in the listing. Check the provider for current pricing.

Local. Runs on your machine (stdio). You install it with npx, uvx, Docker or from source.

Run: claude mcp add nephyr-backtest -- uvx nephyr-backtest

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