Polymarket CLOB API
Official API for interacting with Polymarket’s central limit order book (CLOB) for trading and market data access.
Overview
The Polymarket CLOB (Central Limit Order Book) API is the official gateway for developers to interact with Polymarket’s hybrid-decentralized exchange.It combines the speed of off-chain order matching with the security of on-chain settlement on the Polygon blockchain. This API is the primary tool for market makers, algorithmic traders, and developers building third-party interfaces, offering a professional-grade environment similar to a centralized exchange (CEX) API.
The architecture is divided into three distinct domains: the Gamma API (for market metadata and discovery), the Data API (for user activity), and the CLOB API (for the actual trading engine).It utilizes a non-custodial model where orders are EIP-712 signed messages.This ensures that while the matching engine is efficient and fast, the user always retains control over their funds. The CLOB API provides high-fidelity data, including midpoints, spreads, and full order book depth, making it the "source of truth" for event pricing.
Unlike third-party APIs, the CLOB API is directly integrated with Polymarket’s trading infrastructure, ensuring accuracy, real-time execution, and full control over trading operations.
The Problem
Developers need a reliable and programmatic way to interact with prediction markets for trading and automation.
The Solution
Key Features
Order Book Access (CLOB)
Retrieve bids, asks, and liquidity data in real time.
Trade Execution API
Build, sign, and submit orders programmatically.
Market Data Endpoints
Access pricing, trades, and market metadata.
Key Strengths
How Developers Use Polymarket CLOB API
Trading Bots
Automate strategies and execution.
Custom Trading Interfaces
Build frontends for prediction markets.
Market Making
Provide liquidity programmatically.
Ship faster than your competition
Free RPC across 77+ chains. Spin up an endpoint in under 30 seconds.
Compare
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Resources
The Polymarket CLOB API is the core interface for developers looking to build trading systems on top of Polymarket. It provides full access to order books, trade execution, and market data, making it essential for algorithmic trading and advanced integrations.