Kalshi has significantly outperformed Polymarket in the prediction market sector, capturing 62% of the total trading volume in the U.S. from September 11 to 17, with over $500 million in weekly trading volume. While Polymarket has made moves to re-enter the U.S. market by acquiring QCX and launching new markets, Kalshi's faster trading pace indicates a stronger current user engagement.

Polymarket has achieved a milestone with 13,800 new markets created in August as it prepares to re-enter the U.S. market following a favorable ruling from the Commodity Futures Trading Commission. Despite this growth, overall trading volume has declined, with active traders at their lowest levels since last October.