World Cup final drives billions in bets on Kalshi and Polymarket
The 2026 World Cup final drove billions of dollars in betting volume across Kalshi and Polymarket, with the tournament creating what the New York Times called possibly the largest gambling event in history. Sports dominated activity throughout the tournament. Kalshi added three million new users and posted a $1.27 billion winner market for the final alone, while combined World Cup bets across both platforms exceeded $29 billion. Open interest dropped roughly 20 percent after the final as trading cooled.
The $29 billion World Cup haul turns Kalshi and Polymarket from niche venues into political targets with hard numbers attached. The volume gives Congress concrete data to cite as it weighs a bipartisan Senate bill to ban sports event contracts on CFTC-registered platforms. Kalshi is already stretched across state fights in New York, Washington, Michigan, Illinois, and New Mexico, plus a Second Circuit appeal.
A federal ban would strip the core sports vertical nationwide without waiting for courts. Polymarket faces identical exposure. Both platforms must now build credible self-regulation on insider surveillance and tax reporting before lawmakers act. The platform that moves first may shape any ban's final form or deflect it entirely. DraftKings and Robinhood are watching from their own regulated launches.