Polymarket MCP Server

MCP server for Polymarket prediction markets — powered by the official polymarket-us TypeScript SDK.

Features

• 6 MCP tools for reading market data, searching, and analyzing bets
• Public data — no API key needed for reading markets
• Trading ready — supports authenticated endpoints with API key
• Dual mode — runs as stdio MCP (DuckHive/OpenClaw) or HTTP server

Installation

cd polymarket-mcp
npm install

DuckHive / OpenClaw Setup

Add to ~/.duckhive.json:

{
  "mcpServers": {
    "polymarket": {
      "command": "node",
      "args": ["/path/to/polymarket-mcp.mjs"]
    }
  }
}

For trading (optional), add your API key:

{
  "mcpServers": {
    "polymarket": {
      "command": "node",
      "args": ["/path/to/polymarket-mcp.mjs"],
      "env": {
        "POLYMARKET_KEY_ID": "your_key_id",
        "POLYMARKET_SECRET_KEY": "your_secret_key"
      }
    }
  }
}

Get your API key at: https://app.polymarket.com/api-keys

Tools

HTTP Mode (testing)

node polymarket-mcp.mjs --http
curl http://localhost:3457/health

Known 2026 Midterm Slugs

Docs

• Polymarket API Quickstart
• SDK Reference