Find and calculate arbitrage between Polymarket and other prediction markets. Account for Polymarket's unique fee structure.
Polymarket's deep liquidity on political markets often creates temporary price differences with Kalshi and Robinhood. Polymarket Global's 2% fee on winnings creates a unique arb dynamic — you only pay the fee on the winning leg, not both.
Compare Polymarket contract prices with the same event on Kalshi or Robinhood.
Enter both sides' prices into the Arb Calculator.
Select the correct fee structure for each platform.
Note: Polymarket Global fees apply only to the winning side, not the losing side.
Calculate guaranteed profit and optimal stake split.
Polymarket Yes at $0.45 (Global, fee on win = 2% × $0.55 = $0.011). Robinhood No at $0.50 (fee = $0.02). Total cost: $0.45 + $0.50 + $0.02 = $0.97 + conditional $0.011 on Polymarket win. Worst case profit: $0.019/contract.
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
Find risk-free arbitrage opportunities between Kalshi and other prediction markets. Calculate stakes and guaranteed profit after fees.
Polymarket Fee Calculator — Global vs US Fees ComparedCalculate Polymarket fees for Global (2% on winnings) and US (0.1% taker) versions.
Polymarket Break-Even CalculatorCalculate the minimum win rate needed to profit on Polymarket Global and US.
Polymarket Expected Value CalculatorCalculate EV and optimal sizing for Polymarket positions, accounting for the 2% profit fee.
Ready to start trading on Polymarket?