In this guide
What Are Polymarket's Fees in 2026?
Polymarket does not impose any platform trading fee. Your only expenses come from Polygon gas fees (usually below $0.01 per transaction) and fees charged by exchanges when you swap USDC into GBP. This positions Polymarket as among the most affordable prediction markets for traders in the UK.
Trading Fees: Zero
Rather than operating like conventional sportsbooks that embed a margin (overround) into each market, Polymarket employs an AMM-style order book where liquidity providers determine the spread. Polymarket itself levies no direct "vig". Instead, you encounter the spread implicitly, which tightens as additional liquidity flows into markets.
Gas Fees on Polygon
Every Polymarket transaction executes on the Polygon PoS blockchain, with gas fees denominated in MATIC and averaging between $0.001 and $0.02 per transaction independent of your stake size. The cost differential versus Ethereum mainnet is substantial.
- Opening a position: ~$0.003–0.01
- Closing a position/claiming winnings: ~$0.003–0.01
- Moving USDC to your own wallet: ~$0.005–0.02
- Cross-chain transfer (Polygon → Ethereum): $5–20 (best avoided unless critical)
Deposit Fees
Sending USDC directly onto Polygon incurs no charge from Polymarket. However, your bank or exchange may impose its own withdrawal fee when transferring USDC to Polygon. Coinbase typically deducts ~$0.01–1 based on network activity levels. Opting for native Polygon USDC significantly reduces your outlay.
Currency Conversion Costs (GBP ↔ USDC)
UK-based users encounter their most substantial cost here. A complete conversion cycle (GBP → USDC → GBP) through a leading exchange usually runs 0.5–1.5% in total fees, accounting for both the exchange's bid-ask spread.