In this guide
What Are Polymarket's Fees in 2026?
Polymarket imposes zero platform trading fees. Your only expenses are Polygon gas fees (usually under $0.01 per transaction) and any currency conversion charges when exchanging USDC for GBP. This positions Polymarket amongst the most affordable prediction markets for traders in the UK.
Trading Fees: Zero
In contrast to conventional sportsbooks that embed a margin (overround) into all markets, Polymarket operates via an AMM-style order book where liquidity providers determine the spread. Polymarket itself charges no direct "vig". Instead, you encounter the spread indirectly, which tightens as additional liquidity enters the market.
Gas Fees on Polygon
Every Polymarket transaction executes on the Polygon PoS network, with gas fees denominated in MATIC and ranging from $0.001 to $0.02 per transaction irrespective of order magnitude. The savings versus Ethereum mainnet are substantial.
- Opening a position: ~$0.003–0.01
- Closing a position or cashing out: ~$0.003–0.01
- Moving USDC to a separate account: ~$0.005–0.02
- Cross-chain transfer (Polygon → Ethereum): $5–20 (best avoided except when essential)
Deposit Fees
Transferring USDC directly onto Polygon carries no cost from Polymarket's end. However, your bank or exchange might impose a fee for releasing USDC to the Polygon network. Coinbase may charge ~$0.01–1 contingent on network load. Opting for the Polygon-native USDC pathway reduces overall expenses.
Currency Conversion Costs (GBP ↔ USDC)
UK-based participants typically encounter the greatest cost burden at this stage. A complete conversion cycle (GBP → USDC → GBP) through a leading exchange ordinarily incurs 0.5–1.5% in total fees, encompassing the bid-ask spread.