In this guide
What Are Polymarket's Fees in 2026?
Polymarket imposes no direct platform trading fee. Your only expenses are Polygon gas costs (usually under $0.01 per trade) plus any spreads incurred when exchanging USDC into GBP. This positions Polymarket amongst the most competitive prediction markets for traders in the UK.
Trading Fees: Zero
In contrast to conventional bookmakers that embed an overround margin into each market, Polymarket operates via an AMM-style order book where liquidity providers determine the spread. Polymarket itself does not levy any explicit "vig". Instead, you absorb the spread implicitly, which tightens as additional liquidity flows into markets.
Gas Fees on Polygon
Every Polymarket transaction executes on the Polygon PoS chain, with gas paid in MATIC at rates typically ranging from $0.001 to $0.02 per transaction independent of order magnitude. This represents a substantial saving relative to Ethereum Layer 1.
- Opening a position: ~$0.003–0.01
- Closing a position or settling: ~$0.003–0.01
- Moving USDC off-chain to your wallet: ~$0.005–0.02
- Cross-chain transfer (Polygon → Ethereum): $5–20 (best avoided unless essential)
Deposit Fees
Sending USDC onto Polygon carries no fee from Polymarket's end. However, your bank or exchange may impose a withdrawal charge to route USDC to Polygon. Coinbase typically deducts ~$0.01–1 based on network load. Opting for the standard Polygon USDC pathway reduces expenses.
Currency Conversion Costs (GBP ↔ USDC)
This represents the most significant expense for UK-based participants. A full cycle of conversion (GBP → USDC → GBP) through a mainstream exchange normally incurs 0.5–1.5% in total fees, accounting for both the bid-ask spread and transaction costs.