Polymarket vs Kalshi Prediction Markets Compared

Both platforms operate as designated contract markets under the CFTC, making them distinct from offshore sites and traditional sportsbooks. Sports have become the most heavily traded category in 2026, with the World Cup driving record volume across both platforms.

Polymarket offers new users a "Deposit $20, Get $50 in Trading Bonus" welcome offer, while Kalshi provides "Get $10 Bonus After Your First $10 Trade." Both platforms use probability weighted fee structures that peak near 50 percent probability and shrink as contracts move toward extremes. forestarrow.help