The 2026 FIFA World Cup has become not just a sporting event, but a true watershed moment for the betting industry. Prediction market platforms like Kalshi and Polymarket have not merely surpassed traditional bookmakers—they have effectively rewritten the rules of the game.
According to my data, the total trading volume on these platforms during the World Cup reached an astonishing $50 billion. For comparison, legal US bookmakers were projected by analysts to accept bets totaling between $2.8 and $4.3 billion across all 104 matches. The reality turned out to be far more impressive: Kalshi alone, before the group stage concluded, processed $7.4 billion in tournament contracts.
Explosive Growth and Dominance
June was a landmark month. Trading volume on Kalshi exceeded $31 billion, a 70% increase from May's figure. Notably, 85% of this turnover came specifically from sports contracts. Polymarket also broke its own record, reaching $10.8 billion, while its regulated US version added another $3.5 billion. The Rothera project, created by Robinhood and Susquehanna International Group, processed $2 billion.
The growth driver was an influx of new audiences. According to Apptopia, by the end of June, Kalshi's daily active users had grown by 36% compared to mid-month. This was fueled by a strategic partnership with FIFA and active promotion through Fox Sports.
The Collapse of Traditional Bookmakers
While Kalshi and Polymarket were ramping up, industry giants like DraftKings, FanDuel, BetMGM, and Caesars faced a sharp user exodus. After an initial spike of interest in the tournament, their activity dropped by 32-41%. This is no coincidence—users are voting with their feet (and wallets) in favor of more transparent and decentralized solutions.
An even more telling fact: Kalshi and Polymarket accounted for 78.5% of all installations among the six largest betting and prediction market apps. A year earlier, their combined share was only about 6%.
My Analysis
These figures are not just statistics. They demonstrate a fundamental shift in user behavior. Traditional bookmakers are losing not only in technology but also in trust. Prediction markets offer instant liquidity, transparent settlements, and no betting limits. If the current trend continues, by the next World Cup we could see a complete consolidation of this industry around decentralized platforms. American gambling associations, which are calling for a ban on such services, should think twice: fighting a $50 billion market is no easy task.