In this guide
Can You Use Trading Bots on Polymarket?
Absolutely — Polymarket provides a comprehensive, publicly available CLOB API designed to enable automated and algorithmic trading. The order book can be accessed through both REST and WebSocket protocols, giving UK-based traders the ability to build and run custom automation strategies either through PolyGram or by connecting directly to Polymarket's native API infrastructure.
Polymarket API Overview
The Polymarket CLOB (Central Limit Order Book) API delivers the following capabilities:
- Real-time market data distribution through WebSocket connections
- REST-based tools for submitting, withdrawing, and tracking orders
- Instantaneous L2 order book data snapshots
- Archived transaction records suitable for strategy validation and testing
The authentication mechanism relies on wallet signatures using the EIP-712 standard — there is no need to generate or manage API keys; instead, you simply connect a Polygon-compatible wallet.
Popular Open-Source Polymarket Bot Tools
- py-clob-client — The official Polymarket Python library for interacting with the CLOB API (available on GitHub under Polymarket/py-clob-client)
- polymarket-trading — Developer-contributed Python implementations for liquidity provision and cross-venue trading tactics
- Gamma API — Polymarket's dedicated data service that retrieves all active markets, current pricing, and event details in JSON format
Common Bot Strategies
Market Making
Simultaneously place buy and sell limit orders on both YES and NO outcomes positioned narrowly around the current spread, capturing the difference as volume flows through. This approach works best when markets have sufficient depth and narrow bid-ask gaps.
Calibration Arbitrage
Cross-reference Polymarket pricing with competing platforms such as traditional betting operators or prediction markets like Metaculus and Manifold Markets. Deploy capital when you identify material price discrepancies between venues.
News-Driven Momentum
Integrate news feed APIs (such as Reuters or Associated Press) to spot significant developments before broader market participants react. The speed advantage of programmatic execution over manual intervention creates profitable opportunities.
Risk Warnings
Algorithmic trading introduces specific hazards: programming errors may result in unexpectedly large or incorrect positions being opened. Conduct thorough testing using minimal amounts in simulated environments before committing actual funds. Polymarket does not enforce automatic safeguards against excessive individual trader activity.