Polymarket MCP Server

Polymarket MCP Server — live prediction-market data for AI agents

A production Model Context Protocol server that gives Claude, Cursor, n8n, and any MCP-capable agent live Polymarket data as native tools. No API keys, no wallet — hosted on Apify, pay per tool call.

Tools

Quick start (hosted — recommended)

The server runs on Apify Standby; you authenticate with a free Apify account token:

{
  "mcpServers": {
    "polymarket": {
      "url": "https://mrlarryjohnson--polymarket-mcp-server.apify.actor/mcp",
      "headers": { "Authorization": "Bearer <your-apify-token>" }
    }
  }
}

Or via Apify's MCP gateway: https://mcp.apify.com?tools=mrlarryjohnson/polymarket-mcp-server

Store page: https://apify.com/mrlarryjohnson/polymarket-mcp-server

• Transport: Streamable HTTP · Auth: Bearer (Apify token) · License: MIT
• Pricing: pay-per-tool-call via Apify (no subscription; Apify free tier covers casual use)

Self-hosting

The full server source is in src/ — FastMCP (Python), async httpx, stateless HTTP transport. It runs anywhere; the Apify SDK calls degrade gracefully off-platform. pip install -r requirements.txt, then see src/main.py.

Engineering notes (why this one over a weekend wrapper)

• Fully async — concurrent tool calls never block the event loop
• Fail-loud data integrity — a rate-limited upstream call raises; it never returns a plausible-but-empty result for an agent to hallucinate around
• Single-flight market cache — concurrent agents share one upstream fetch
• Billing integrity — error responses are never billed

Built by the maker of Polymarket Whale Tracker Pro and Polymarket Top Traders.