The 2026 FIFA World Cup has transformed prediction markets into a high-stakes public ledger, drawing billions of dollars in trading volume to platforms such as Kalshi and Polymarket. According to a Bloomberg News analysis of Dune Analytics data and company records, more than $5 billion was traded on the tournament across the two exchanges.
The surge in activity marks a significant growth period for the event-based trading industry. In June, Kalshi processed more than $30 billion in total trading volume, a more than 70% increase from the nearly $18 billion recorded in May. Polymarket also saw substantial demand, reporting $10.8 billion in trading volume for the month of June.
The Impact of the World Cup on Trading Volume
The World Cup group stage, which commenced on June 11, served as a primary catalyst for the industry’s record-breaking performance. Following the tournament’s start, Kalshi averaged more than $1 billion in daily trading. Data from the week of June 8 illustrates the intensity of this growth. During that period, Kalshi reached $6.38 billion in weekly notional volume—up 43% from the prior week—while Polymarket Global saw its volume rise 22% to $2.33 billion. Combined, the two platforms accounted for nearly $8.7 billion in notional volume during that single week. This momentum reached a peak over the weekend of June 13–14. On Saturday, June 13, Kalshi recorded its first-ever billion-dollar day with $1.22 billion in notional volume, followed by $1.24 billion on Sunday, June 14.
Market Concentration and User Engagement
The surge in volume has been heavily concentrated in sports-related contracts. On Kalshi, the Sports category jumped 52% to $3.38 billion during the week of June 8, while “Exotics”—the platform’s parlay-style combo contracts—crossed $2 billion in a single week for the first time. Together, these two categories accounted for 85% of Kalshi’s weekly notional volume. Interest in the tournament was particularly high regarding the performance of the United States. Ahead of the U.S. match against Belgium, over $64 million had been traded on Kalshi on the question of whether the U.S. would win the World Cup, while Polymarket saw $122 million traded on the same outcome. Following the U.S. team’s 4-1 loss to Belgium, it remains to be seen how tournament-related trading will evolve.
Platform Differences and Industry Evolution
While both platforms are benefiting from the World Cup, they operate with different user profiles. Kalshi, which is U.S.-regulated, tends to attract fewer, larger bets with an average size of approximately $147, whereas the crypto-native Polymarket typically sees a higher volume of smaller bets, averaging roughly $95.
The platforms have seen their growth trajectories diverge since April, with Kalshi leading in total lifetime notional volume at $102.30 billion compared to Polymarket’s $93.28 billion.
Industry analysts note that these prediction markets are increasingly intersecting with the audience for traditional online sports wagering. Unlike traditional sportsbooks, which act as a “house” taking the other side of every bet, Kalshi operates as an exchange where customers trade against one another, similar to stock and derivatives markets.
The scale of this activity, with tens of billions of dollars in monthly volume generated by a single global tournament, suggests that major sporting events act as demand accelerators for event-based trading. As these platforms continue to expand, their role in the broader financial and sports-wagering landscape continues to draw significant attention.
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