Calculate EV and optimal sizing for Polymarket positions, accounting for the 2% profit fee.
Polymarket's fee structure is unique: the Global platform only charges 2% on net profits. This means your EV calculation only needs to account for fees on winning scenarios — losing trades are fee-free. This asymmetry favors high-conviction, lower-probability bets.
Enter the Polymarket contract price and select Polymarket.
Choose Global or US region to apply the correct fee structure.
Input your true probability estimate.
Review the EV including fee adjustments.
Check the Kelly sizing — it will account for the asymmetric fee structure.
Polymarket Global Yes at $0.35, true probability 45%. Fee only on winning: 2% × $0.65 = $0.013. EV = (0.45 × $0.637) - (0.55 × $0.35) = $0.287 - $0.193 = +$0.094/contract. Strong +EV with minimal fee drag.
Fee model: 2% on net profits at withdrawal (Global) / 0.1% taker fee (US)
Formula: Global: 0.02 × net profit | US: 0.001 × premium per trade
Timing: Charged at resolution or withdrawal
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