japp-fi/polymarket-mcp-server

This is an MCP server, a standardized plug-in that lets AI assistants like Claude or Cursor interact with external services through a defined protocol, specifically connecting to Polymarket, a decentralized prediction market platform where people bet on the outcomes of real-world events. The server has two tiers of capability. The first tier is publicly available and requires no login: you can search for prediction markets, see trending topics, browse categories, inspect order books (the list of active bids and offers), and check prices and trading volume. The second tier requires wallet credentials and unlocks actual trading: placing and canceling orders, managing your portfolio positions, checking profit and loss, and approving token allowances. Under the hood, market discovery and analysis calls go through Polymarket's public HTTP APIs, while authenticated trading uses Polymarket's CLOB (Central Limit Order Book) client, which derives API credentials from a Polygon blockchain wallet's private key. The server runs as a stdio MCP process, meaning an AI coding tool connects to it and can then call Polymarket actions as if they were built-in tools. A developer or trader who wants their AI assistant to be able to look up current prediction market odds, research trending events, or even place trades programmatically would use this. It requires Node.js 18 or newer and is written in TypeScript. For live trading, a Polygon wallet private key must be supplied, a demo mode is available without wallet credentials.