Prediction Markets Expand Sharply in U.S. Sports Betting During 2026 World Cup

Data from the 2026 FIFA World Cup period shows prediction-market platforms captured an estimated 27 percent of all legal U.S. sports-betting volume throughout the tournament, a marked increase from the 9 percent share recorded at the beginning of the year, and this expansion occurred while traditional operators recorded comparatively slower growth rates.

Platforms such as Kalshi and Polymarket handled the increased activity, with traders focusing on event outcomes tied directly to World Cup matches, and the volume shift placed additional competitive pressure on established sportsbooks including FanDuel and DraftKings during the high-profile global event that concluded in July 2026.

Volume Shifts Documented Across Platforms

Industry estimates derived from public tournament data indicate the rise in prediction-market participation happened alongside the tournament schedule, and the 27 percent figure reflects activity concentrated in contracts that settled on match results, team advancement, and related outcomes, whereas the 9 percent baseline earlier in the year covered a broader set of sports and events.

Those tracking the sector note that prediction markets operate through direct trading of outcome contracts rather than fixed-odds wagering, which allowed participants to adjust positions in real time as matches progressed, and this mechanism drew volume away from conventional books during peak tournament days.

Comparison With Traditional Sportsbooks

Traditional operators experienced growth during the same period, yet the rate remained below the expansion recorded by prediction-market venues, and observers point to the difference as evidence that contract-based platforms competed effectively for the same pool of legal betting dollars in states where both formats operate.

Figures compiled for the World Cup window reveal the prediction-market share increase outpaced the gains posted by FanDuel and DraftKings, while the overall legal sports-betting market expanded due to heightened interest in the international tournament.

Role of Kalshi and Polymarket

Kalshi and Polymarket facilitated the bulk of the documented prediction-market activity, and traders on these venues created and exchanged contracts tied to specific World Cup scenarios, with settlement occurring once official match results became available, and the platforms operated under regulatory frameworks that permitted such trading in multiple U.S. states.

Activity on these sites accelerated as the tournament advanced through knockout stages, and the cumulative volume contributed to the 27 percent share cited in the tournament-wide estimates, whereas earlier months had shown more modest participation levels across a wider range of sports.

Competitive Pressure on Major Operators

FanDuel and DraftKings encountered the effects of this shift as prediction-market platforms captured a larger portion of available betting activity during the World Cup, and the resulting competitive dynamic emerged at a time when overall legal sports betting continued to grow in regulated markets.

Market data covering the event period shows the traditional sportsbooks maintained substantial absolute volumes, yet the percentage gains trailed those of the prediction-market segment, and this pattern prompted operators to monitor contract-based platforms as ongoing sources of competition.

Context Within Broader Market Trends

The World Cup surge built on an existing upward trajectory for prediction markets that began earlier in 2026, and the jump from 9 percent to 27 percent occurred within a compressed timeframe centered on the tournament, while regulatory environments in participating states allowed both formats to coexist.

Analysts reviewing the period note that event-driven interest amplified trading on outcome contracts, and the resulting volume concentration during July 2026 highlighted how major international competitions can accelerate shifts in market share between different betting formats.

Conclusion

The documented increase in prediction-market activity during the 2026 FIFA World Cup illustrates a measurable change in how U.S. bettors allocated legal wagering volume, with Kalshi and Polymarket together accounting for 27 percent of the total during the tournament compared with 9 percent earlier in the year, and this development occurred alongside continued operations by traditional sportsbooks such as FanDuel and DraftKings.

Estimates compiled from tournament data confirm the outperformance in growth rates relative to conventional platforms, and the pattern provides a clear record of competitive dynamics within the regulated sports-betting sector during the global event.