In this guide
Can You Use Trading Bots on Polymarket?
Absolutely — Polymarket provides a comprehensive, publicly available CLOB API that enables algorithmic and bot-driven trading. The order book can be accessed through both REST and WebSocket protocols, making it straightforward for UK-based traders to programme automated tactics either through PolyGram or by interfacing directly with Polymarket's own API infrastructure.
Polymarket API Overview
Polymarket's CLOB (Central Limit Order Book) API includes the following capabilities:
- Real-time market data delivery via WebSocket connections
- REST-based functionality for submitting, withdrawing, and tracking orders
- Instantaneous L2 order book snapshots
- Archived transaction records suitable for strategy validation
Access control relies on wallet signatures using the EIP-712 standard — there is no traditional API key requirement, only a functioning Polygon wallet address.
Popular Open-Source Polymarket Bot Tools
- py-clob-client — Authorised Python library for interfacing with the CLOB API (available on GitHub: Polymarket/py-clob-client)
- polymarket-trading — Volunteer-maintained Python implementations for market-neutral tactics and cross-venue trading
- Gamma API — Polymarket's market intelligence interface delivering active markets, valuations, and supplementary information in JSON format
Common Bot Strategies
Market Making
Simultaneously place buy and sell limit orders bracketing the midpoint to capture the spread differential as volume flows through. This approach generates returns in sufficiently active venues where the spread remains narrow.
Calibration Arbitrage
Examine Polymarket valuations in relation to conventional sportsbooks or prediction platforms (Metaculus, Manifold). Identify and exploit situations where meaningful valuation gaps emerge.
News-Driven Momentum
Leverage news aggregation services (Reuters, AP) to spot impactful announcements before broader market participants adjust their holdings. The speed advantage of API-based execution outpaces manual intervention.
Risk Warnings
Algorithmic trading introduces substantial hazards: programming errors may trigger unexpectedly large exposures. Conduct thorough testing using modest amounts in simulation mode before committing genuine funds. Polymarket does not enforce safeguards to prevent individual traders from over-leveraging.