In this guide
Can You Use Trading Bots on Polymarket?
Absolutely — Polymarket offers a publicly accessible CLOB API that permits both algorithmic and bot-driven trading activity. The order book can be accessed through REST and WebSocket protocols, enabling UK-based traders to programme and execute strategies via PolyGram or by integrating directly with Polymarket's native API infrastructure.
Polymarket API Overview
The Polymarket CLOB (Central Limit Order Book) API includes:
- Real-time market data distribution through WebSocket connections
- REST-based endpoints for submitting, withdrawing, and tracking orders
- Instantaneous L2 order book captures and feeds
- Archived transaction records suitable for strategy validation and testing
Access control relies on wallet-based cryptographic signatures (EIP-712) — there is no traditional API key system; instead, you authenticate using your Polygon wallet credentials.
Popular Open-Source Polymarket Bot Tools
- py-clob-client — Polymarket's authorised Python library for CLOB API integration (available at GitHub: Polymarket/py-clob-client)
- polymarket-trading — Developer-created Python modules for executing market-making and arbitrage tactics
- Gamma API — Polymarket's dedicated information service delivering all active markets, valuations, and supplementary details in JSON format
Common Bot Strategies
Market Making
Simultaneously submit YES and NO orders at prices marginally better than the current spread, capturing the differential as transactions flow through. This approach generates returns in sufficiently liquid venues where spreads remain narrow.
Calibration Arbitrage
Benchmark Polymarket valuations against conventional sportsbooks or prediction platforms (Metaculus, Manifold). Identify and exploit situations where substantial price discrepancies emerge.
News-Driven Momentum
Leverage news feed services (Reuters, AP) to spot significant announcements ahead of broader market reaction. The speed advantage of programmatic execution via API outpaces slower manual intervention.
Risk Warnings
Algorithmic trading introduces substantial hazards: programming errors may trigger unexpectedly large exposures or uncontrolled positions. Conduct thorough testing using minimal capital in simulation mode before committing substantial funds. Polymarket operates without built-in safeguards against excessive individual trader activity.