Skip to main content
Polymarket provides a suite of APIs and SDKs for building prediction market applications. This guide will help you understand what’s available and where to find it.

​
What Can You Build?

If you want to…Start here
Fetch markets & pricesFetching Market Data
Place orders for yourselfPlacing Your First Order
Build a trading app for usersBuilders Program Introduction
Provide liquidityMarket Makers

​
APIs at a Glance

​
Markets & Data

Gamma API

Market discovery & metadataFetch events, markets, categories, and resolution data. This is where you discover what’s tradeable.https://gamma-api.polymarket.com

CLOB API

Prices, orderbooks & tradingGet real-time prices, orderbook depth, and place orders. The core trading API.https://clob.polymarket.com

Data API

Positions, activity & historyQuery user positions, trade history, and portfolio data.https://data-api.polymarket.com

WebSocket

Real-time updatesSubscribe to orderbook changes, price updates, and order status.wss://ws-subscriptions-clob.polymarket.com

​
Additional Data Sources

RTDS

Low-latency data streamReal-time crypto prices and comments. Optimized for market makers.

Subgraph

Onchain queriesQuery blockchain state directly via GraphQL.

​
Trading Infrastructure

CTF Operations

Token split/merge/redeemConvert between USDC and outcome tokens. Essential for inventory management.

Relayer Client

Gasless transactionsBuilders can offer gasfree transactions via Polymarket’s relayer.

​
SDKs & Libraries

CLOB Client (TypeScript)

npm install @polymarket/clob-client

CLOB Client (Python)

pip install py-clob-client
For builders routing orders for users:

Relayer Client

Gasless wallet operations

Signing SDK

Builder authentication headers