Can You Use Trading Bots on Polymarket?
Yes — Polymarket has a fully documented CLOB API that supports algorithmic and bot trading. The order book is accessible via REST and WebSocket, allowing UK traders to automate strategies through PolyGram or directly via the Polymarket API.
Polymarket API Overview
The Polymarket CLOB (Central Limit Order Book) API supports:
- Market data streaming via WebSocket
- REST endpoints for placing, cancelling, and monitoring orders
- L2 order book snapshots in real time
- Historical trade data for backtesting
Authentication uses wallet signatures (EIP-712) — no API key required, just a Polygon wallet.
Popular Open-Source Polymarket Bot Tools
- py-clob-client — Official Python client for the CLOB API (GitHub: Polymarket/py-clob-client)
- polymarket-trading — Community Python strategies for market making and arbitrage
- Gamma API — Polymarket's data API for fetching all live markets, prices, and metadata in JSON
Common Bot Strategies
Market Making
Post simultaneous YES and NO limit orders just inside the spread to earn the bid-ask spread as markets trade. Profitable in liquid markets with tight spreads.
Calibration Arbitrage
Compare Polymarket odds against traditional bookmakers or forecasting sites (Metaculus, Manifold). Enter positions where significant mispricings exist.
News-Driven Momentum
Use news APIs (Reuters, AP) to detect market-moving headlines before the crowd updates positions. Fast execution via the API gives an edge over manual traders.
Risk Warnings
Automated trading carries risks: bugs in your code can lead to unintended large positions. Always test with small stakes on paper before deploying real capital. Polymarket has no circuit breakers on user-level over-trading.