In this guide
What Are Polymarket's Fees in 2026?
Polymarket imposes no direct platform trading fee. Your only expenses are Polygon gas fees (usually below $0.01 per transaction) and any fees incurred when swapping 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 betting operators that embed a margin (overround) into each market, 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 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 stake amount. This represents a substantial saving compared to Ethereum's main chain.
- Opening a position: ~$0.003–0.01
- Closing a position or claiming winnings: ~$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
Moving USDC directly onto Polygon carries no charge from Polymarket itself. However, your bank or exchange may impose a fee when dispatching USDC to the Polygon network. Coinbase typically charges ~$0.01–1 depending on current network activity. Opting for the native Polygon USDC route keeps expenses down.
Currency Conversion Costs (GBP ↔ USDC)
For UK participants, this represents the most substantial fee consideration. A full conversion cycle (GBP → USDC → GBP) through a leading exchange typically runs 0.5–1.5% in total cost, accounting for the bid-ask spread.