In this guide
Can You Use Trading Bots on Polymarket?
Absolutely — Polymarket offers a publicly available CLOB API that enables algorithmic and bot-driven trading. The order book is fully accessible through both REST and WebSocket protocols, permitting UK-based traders to programme and execute automated strategies either through PolyGram or by interfacing directly with Polymarket's native API infrastructure.
Polymarket API Overview
The Polymarket CLOB (Central Limit Order Book) API provides:
- Real-time market data delivery via WebSocket connections
- REST-based endpoints for submitting, withdrawing, and tracking order status
- Instantaneous L2 order book snapshots across all live markets
- Archived transaction records suitable for strategy validation and simulation
Wallet signatures (EIP-712) handle authentication — no conventional API credentials are necessary, only a functioning Polygon-compatible wallet address.
Popular Open-Source Polymarket Bot Tools
- py-clob-client — Polymarket's authoritative Python library for CLOB API integration (Repository: Polymarket/py-clob-client)
- polymarket-trading — Open-source Python modules implementing community-contributed market-making and cross-exchange strategies
- Gamma API — Polymarket's dedicated data service for retrieving active markets, current pricing, and full metadata in JSON format
Common Bot Strategies
Market Making
Simultaneously place paired YES and NO orders at limit prices positioned marginally inside the current spread, capturing the differential as volume flows through. This approach generates consistent returns in sufficiently liquid venues where spreads remain compressed.
Calibration Arbitrage
Benchmark Polymarket's quoted prices against competing outcome markets or alternative forecasting platforms (Metaculus, Manifold). Identify and exploit pricing discrepancies by establishing positions where material valuation gaps appear.
News-Driven Momentum
Integrate external news feeds (Reuters, AP) to identify significant announcements ahead of broader market repricing. Rapid API-based execution provides a meaningful advantage relative to slower manual order placement.
Risk Warnings
Algorithmic trading introduces material hazards: programming errors may inadvertently trigger oversized or unintended exposures. Conduct thorough simulation and small-scale testing before committing substantial funds to live trading. Polymarket enforces no automated safeguards or position limits at the individual trader level.