In this guide
What Are Polymarket's Fees in 2026?
Polymarket imposes no platform trading fee. Your expenses are limited to Polygon gas fees (usually below $0.01 per trade) and any conversion charges when exchanging USDC into GBP. This positions Polymarket amongst the most cost-effective prediction markets for traders in the UK.
Trading Fees: Zero
In contrast to conventional sportsbooks that embed a margin (overround) into each market, Polymarket operates via an AMM-style order book where liquidity providers determine the spread. Polymarket itself levies no direct "vig". You encounter the spread indirectly, which tightens as additional liquidity flows into markets.
Gas Fees on Polygon
Every Polymarket transaction executes on the Polygon PoS network, with gas costs denominated in MATIC and ranging from $0.001 to $0.02 per transaction independent of stake size. This represents a substantial saving relative to Ethereum mainnet costs.
- Opening a trade: ~$0.003–0.01
- Closing a trade or cashing out: ~$0.003–0.01
- Sending USDC to an external address: ~$0.005–0.02
- Cross-chain bridge (Polygon → Ethereum): $5–20 (best avoided unless essential)
Deposit Fees
Moving USDC onto Polygon carries no charge from Polymarket itself. However, your exchange may impose a fee to transfer USDC to the Polygon network. Coinbase typically deducts ~$0.01–1 based on network load. Opting for the native Polygon USDC chain reduces your outlay.
Currency Conversion Costs (GBP ↔ USDC)
UK-based users encounter the most substantial expense at the conversion stage. A full round-trip conversion (GBP → USDC → GBP) through a mainstream exchange normally incurs 0.5–1.5% in total costs, encompassing the exchange bid-ask margin.