Complete integration guide for Polymarket's CLOB and Gamma APIs with order execution and market data.

• Covers three authentication levels (public market data, signer key derivation, authenticated trading) with endpoints for orderbooks, pricing, positions, and order management
• Includes Python client patterns for market data fetching, limit order placement, WebSocket subscriptions, and real-time updates via py_clob_client library
• Supports four order types (GTC, GTD, FOK, IOC) with price calculations for implied probability, cost estimation, and P&L tracking
• Provides error handling for common failures (insufficient balance, invalid price) and rate limit guidance (100–1000 req/min depending on endpoint tier)
• References key Polygon contract addresses for CTF Exchange, Conditional Tokens, and USDC integration