In this guide
What Are Polymarket's Fees in 2026?
Polymarket imposes no direct platform trading fee. Your only expenses consist of Polygon gas fees (usually below $0.01 per transaction) plus any currency conversion charges when exchanging USDC into GBP. This positions Polymarket amongst the most cost-efficient 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 does not levy an explicit "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 ranging from $0.001 to $0.02 per transaction irrespective of stake size. This represents a substantial saving compared to Ethereum layer one.
- Opening a position: ~$0.003–0.01
- Closing a position/settlement: ~$0.003–0.01
- Transferring USDC to an external address: ~$0.005–0.02
- Cross-chain transfer (Polygon → Ethereum): $5–20 (best avoided unless essential)
Deposit Fees
Sending USDC directly onto Polygon incurs no fee from Polymarket. However, your chosen exchange may impose a withdrawal charge to transfer USDC to Polygon. Coinbase typically charges ~$0.01–1 contingent on network demand. Opting for the native Polygon USDC chain reduces overall outlay.
Currency Conversion Costs (GBP ↔ USDC)
This represents the most substantial expense for UK-based users. A complete conversion cycle (GBP → USDC → GBP) through a mainstream exchange typically incurs 0.5–1.5% in total costs, factoring in the bid-ask spread.