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Polymarket Has Three Separate APIs in 2026: A Developer's Practical Guide

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Polymarket's trading infrastructure is split across three distinct APIs — Gamma, CLOB, and Data — each with separate base URLs, authentication methods, and rate limits. The Gamma API serves as a public metadata layer for market listings and requires no authentication, while the CLOB API handles live order books and requires Polygon wallet signing via EIP-712 and HMAC for trade execution. A major CLOB contract upgrade in April 2026 shifted collateral from USDC.e to pUSD and changed roughly half of all order-struct fields, making older tutorials unreliable. Developers using market-style orders should note strict decimal precision rules — maker amounts allow at most two decimals and taker amounts at most four — as SDK rounding bugs can silently produce server-rejected orders. For real-time data, WebSocket feeds are recommended over REST polling to avoid hitting rate limits, which cap at around 9,000 requests per 10-second window on CLOB and far lower on other endpoints.

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