Kalshi promo code vs. Polymarket promo code: Which has lower fees?

If you want to put your money where your mouth is on the next big event, choosing the right prediction market can make a huge difference to your profits. You’ll want to know exactly how much each platform takes off the top and how to get the best welcome bonuses to offset those costs before you make your first transaction.

This guide simplifies the true cost of trading by comparing Kalshi’s dynamic, formula-based transaction fees to Polymarket’s unique fee structure. We’ll also be highlighting the best promo codes available right now for both platforms so you can maximize your starting bankroll right out of the gate. By the end, you’ll know exactly which exchange is best suited to your trading style and puts more of your winnings into your pocket.