Polymarket Fees Explained: Complete Cost Breakdown for 2026

One of Polymarket's biggest advantages is its fee structure — or lack thereof. But there are still costs traders need to understand. Here's the complete breakdown.

Trading Fees

Polymarket charges zero trading commissions. Unlike sportsbooks that build in 5-10% margins, Polymarket is peer-to-peer. When you buy shares at 60¢, someone else is selling them at 60¢. No middleman taking a cut.

Gas Fees

Polymarket runs on the Polygon network, which has extremely low gas fees — typically less than $0.01 per transaction. Compare this to Ethereum mainnet where a single swap might cost $5-50.

Deposit Costs

• Credit/debit card: ~2-3% processing fee through MoonPay
• USDC transfer from exchange: Network fee only (pennies on Polygon)
• Bank transfer via bridge: Varies by bridge service, typically 0.1-0.5%

Withdrawal Costs

Withdrawing USDC from Polymarket to your wallet costs only the Polygon gas fee (under $0.01). Bridging to Ethereum or converting to fiat through an exchange may incur additional fees depending on your chosen service.

Hidden Costs to Watch

• Spread cost: Illiquid markets may have wide bid-ask spreads, effectively costing you 2-5%
• Slippage: Large orders in thin markets move the price against you
• Opportunity cost: USDC locked in positions earns no interest

How to Minimize Costs

• Deposit via USDC transfer instead of credit card to avoid the 2-3% fee
• Use limit orders instead of market orders to avoid slippage
• Trade liquid markets with tight spreads
• Batch your deposits to minimize bridge fees

Polymarket vs Competitors on Fees

Polymarket's zero-commission model gives it a significant edge. Kalshi charges fees on trades. Traditional sportsbooks take 5-10% vig. When you're trading thousands of dollars, these savings compound significantly over time.

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