In this guide
What Are Polymarket's Fees in 2026?
Polymarket does not impose any platform trading fee. Your only expenses are Polygon gas fees (usually below $0.01 per transaction) plus any costs incurred when exchanging USDC to GBP. This positions Polymarket amongst the most economical prediction markets for traders based in the UK.
Trading Fees: Zero
In contrast to conventional bookmakers that embed an overround into every market, Polymarket operates via an AMM-style order book where liquidity providers determine the spread. Polymarket itself levies no direct "vig." Instead, you encounter the spread indirectly, which tightens as additional liquidity enters the market.
Gas Fees on Polygon
Every transaction on Polymarket executes on the Polygon PoS chain, with gas paid in MATIC at rates typically ranging from $0.001 to $0.02 per transaction, independent of your stake size. The savings versus Ethereum mainnet are substantial.
- Opening a position: ~$0.003–0.01
- Closing a position or claiming winnings: ~$0.003–0.01
- Transferring USDC to your own wallet: ~$0.005–0.02
- Cross-chain transfer (Polygon → Ethereum): $5–20 (best avoided unless critical)
Deposit Fees
Moving USDC onto Polygon carries no charge from Polymarket's end. However, your bank or exchange may deduct a fee when transferring USDC to the Polygon network. Coinbase typically charges ~$0.01–1 contingent on network load. Opting for the native Polygon USDC route keeps expenses down.
Currency Conversion Costs (GBP ↔ USDC)
UK-based participants encounter their largest fee burden at the conversion stage. A full cycle of swapping GBP into USDC and back again through a major exchange normally runs 0.5–1.5% in total cost, factoring in the bid-ask spread.