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 under $0.01 per transaction) and conversion charges when you exchange USDC for GBP. This positions Polymarket as one of the most affordable prediction markets for traders based in the UK.
Trading Fees: Zero
In contrast to conventional sportsbooks that embed a margin (overround) into every offering, Polymarket operates via an AMM-style order book where liquidity providers determine the spread. Polymarket itself does not levy an explicit "vig". You encounter the spread implicitly, which tightens as more liquidity enters the market.
Gas Fees on Polygon
Every Polymarket transaction executes on the Polygon PoS chain, with gas fees denominated in MATIC and ranging from $0.001 to $0.02 per transaction independent of stake size. This represents a substantial saving versus Ethereum mainnet costs.
- Opening a position: ~$0.003–0.01
- Closing a position or cashing out: ~$0.003–0.01
- Transferring USDC to your own wallet: ~$0.005–0.02
- Cross-chain transfer (Polygon → Ethereum): $5–20 (best avoided except when essential)
Deposit Fees
Moving USDC straight onto Polygon incurs no charge from Polymarket. Your bank or exchange may levy a fee when sending USDC to Polygon. Coinbase typically charges ~$0.01–1 depending on current network load. Opting for the native Polygon USDC chain keeps your costs down.
Currency Conversion Costs (GBP ↔ USDC)
UK-based users encounter their biggest fee impact here. A full cycle of conversions (GBP → USDC → GBP) through a mainstream platform normally runs 0.5–1.5% in total fees, factoring in the bid-ask spread.