In this guide
What Are Polymarket's Fees in 2026?
Polymarket imposes no direct platform trading charge. Your only expenses come from Polygon gas fees (usually below $0.01 per trade) plus any conversion costs when changing USDC into GBP. This positions Polymarket amongst the most economical prediction markets for participants in the UK.
Trading Fees: Zero
Rather than traditional bookmakers who embed a margin (overround) across all markets, Polymarket employs an AMM-style order book where liquidity providers determine the spread. Polymarket itself levies no separate "vig". You encounter the spread indirectly, which tightens as more capital flows into markets.
Gas Fees on Polygon
Every Polymarket transaction executes on the Polygon PoS chain, where gas costs are denominated in MATIC and range from $0.001 to $0.02 per transaction irrespective of stake size. This represents a substantial saving versus Ethereum's mainnet.
- Opening a position: ~$0.003–0.01
- Closing a position/settlement: ~$0.003–0.01
- Transferring USDC to your own wallet: ~$0.005–0.02
- Cross-chain transfer (Polygon → Ethereum): $5–20 (best avoided unless essential)
Deposit Fees
Moving USDC onto Polygon carries no fee from Polymarket itself. However, your bank or exchange may deduct a fee when releasing USDC to Polygon's network. Coinbase typically takes ~$0.01–1 depending on how busy the network is. Opting for the standard Polygon USDC pathway keeps your costs down.
Currency Conversion Costs (GBP ↔ USDC)
For UK-based traders, this represents the most substantial expense category. A full cycle of converting GBP into USDC and back to GBP through a mainstream exchange normally runs 0.5–1.5% in total cost, factoring in both the bid-ask spread.