Lower Fees Power Prediction Markets

Lower fees are not just a better price for users, they are the core reason prediction markets can attack sportsbooks from underneath. A sportsbook bakes its margin into the line and keeps that spread. Polymarket and Kalshi run closer to an exchange, where users trade against each other and the platform mainly charges transaction fees. That makes prices tighter, lets sharper traders move more size, and makes frequent sports trading feel closer to crypto or equities than to a casino bet.1 2 3 4 5

• The fee gap is concrete in product design. Polymarket originally used zero trading fees to maximize liquidity, then later introduced small taker fees by category while keeping makers at zero. Kalshi also charges transaction fees tied to contract economics, not a fixed sportsbook style hold on every wager.1 2 3 4
• That lower take changes user behavior. On an order book, a trader can buy at 48 cents, sell at 54 cents before the game ends, and only pay exchange fees on the fills. In a sportsbook, the user usually pays the vig up front and has fewer ways to trade in and out around the position.2 3 4 5
• The strategic tradeoff is that exchange economics need real liquidity. Polymarket uses crypto rails and fee rebates to attract market makers, while Kalshi uses CFTC regulated market structure and incentive programs. Both are building deeper books so low fees do not come with worse execution.1 2 3 4 6

The direction is toward sports markets that look less like sportsbook tickets and more like financial trading screens. As liquidity deepens, fees should stay structurally below sportsbook vig, which puts pressure on DraftKings and FanDuel either to narrow margins or to add more exchange like products of their own.2 3 4 5 6