Calculate Polymarket's per-category taker fee (0.04–0.07 by category) with the fee = C × feeRate × p × (1−p) formula.
Polymarket charges takers a per-category fee: fee = C × feeRate × p × (1−p), where C is shares and p is the price in dollars. The feeRate is 0.05 for sports, 0.07 for crypto, and 0.04 for politics and finance. Like Kalshi's curve, the fee peaks at $0.50 and shrinks toward $0 and $1. Makers who post resting limit orders pay $0 and earn a rebate (15% sports, 20% crypto, 25% other) from collected taker fees.
Enter the contract price for your intended position.
Select Polymarket and the market category (sports, crypto, or politics/finance) to set the fee rate.
Choose your order type: taker for market orders, maker for limit orders (makers pay $0).
Review the fee breakdown: fee per share, effective cost, and effective payout.
Use the break-even probability to assess your minimum required win rate.
Buy Yes at $0.40 on Polymarket (sports). Taker fee = 0.05 × 0.40 × 0.60 = $0.012 per share, charged at trade. Effective cost $0.412. Break-even = 0.412 / 1.00 = 41.2%. Makers who post a limit order pay $0.
Fee model: Per-category taker fee: fee = C × feeRate × p × (1−p). 0.05 sports, 0.07 crypto, 0.04 politics/finance. Makers pay 0.
Formula: C × feeRate × p × (1 - p); feeRate 0.04–0.07 by category (sports 0.05 as of Jul 2026)
Timing: Charged at time of trade
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