In this guide
Can You Use Trading Bots on Polymarket?
Absolutely — Polymarket offers a publicly available CLOB API designed for algorithmic and bot-driven trading. The order book is openly accessible through both REST and WebSocket protocols, enabling UK-based traders to programme automated approaches either through PolyGram or by interfacing directly with Polymarket's API infrastructure.
Polymarket API Overview
The Polymarket CLOB (Central Limit Order Book) API provides:
- Real-time market data dissemination via WebSocket connections
- REST-based endpoints for submitting, withdrawing, and tracking orders
- Instantaneous L2 order book snapshots
- Archived transaction records suitable for strategy validation
Signing in relies on wallet-based cryptographic signatures (EIP-712) — there is no traditional API key; instead, you simply need a Polygon-compatible wallet address.
Popular Open-Source Polymarket Bot Tools
- py-clob-client — Polymarket's native Python wrapper for CLOB interaction (Repository: Polymarket/py-clob-client)
- polymarket-trading — Open-source Python implementations for liquidity provision and statistical arbitrage
- Gamma API — Polymarket's metadata service delivering current markets, price feeds, and supplementary information in JSON format
Common Bot Strategies
Market Making
Simultaneously place buy and sell orders for YES and NO outcomes slightly better than prevailing market prices, capturing the spread between them as volume flows through. This approach works best when markets feature adequate liquidity and narrow bid-ask gaps.
Calibration Arbitrage
Contrast Polymarket pricing with conventional betting operators or prediction aggregators (Metaculus, Manifold). Identify and exploit situations where valuations diverge materially from fair value.
News-Driven Momentum
Tap into news feed services (Reuters, AP) to spot significant announcements before broader market participants adjust their holdings. Rapid API-based entry gives a speed advantage versus those trading manually.
Risk Warnings
Algorithmic approaches introduce their own hazards: software defects may trigger unexpectedly large exposures. Conduct thorough testing using minimal amounts in simulation mode before committing substantial funds to live trading. Polymarket does not enforce individual-level safeguards against excessive automated orders.