Prediction Markets Hit $45B in June as Sports Betting Drives Surge

Kalshi and Polymarket recorded a combined trading volume of $45 billion in June, marking a 75% increase compared to the previous month, driven largely by heightened activity around World Cup-related prediction markets.

Kalshi posted the steepest month-over-month growth among the platforms tracked, with its volume rising 87.4% to $31.5 billion from $16.81 billion in May. The platform's performance outpaced its competitors in both absolute volume gains and percentage growth during the period.

Polymarket also contributed significantly to the combined figure, with the two platforms together accounting for the full $45 billion total reported for June. The surge reflects a broader trend of accelerating user engagement on decentralized and regulated prediction market platforms as major global sporting events attract new participants.

World Cup fever has been cited as a primary catalyst for the spike in activity. Prediction markets allow users to place positions on the outcomes of sporting events, elections, and other real-world occurrences, and large-scale tournaments have historically generated outsized trading volumes on such platforms.

The June figures underscore the growing mainstream appeal of prediction markets, which have seen sustained growth over the past year as both retail and institutional participants increase their exposure to event-driven financial instruments. Kalshi, which operates as a regulated exchange in the United States under oversight from the Commodity Futures Trading Commission (CFTC), has been expanding its product offerings to capture demand from a wider audience.

Polymarket, a decentralized prediction market built on the Polygon blockchain, has similarly attracted significant liquidity, particularly around politically and culturally significant events. The platform does not require users to hold accounts with traditional financial intermediaries, lowering the barrier to entry for global participants.

The combined $45 billion figure for June represents one of the strongest monthly performances recorded by prediction market platforms to date, suggesting that the sector is maturing rapidly. Analysts tracking the space note that major calendar events — including elections, sports championships, and macroeconomic announcements — consistently act as volume accelerants for these platforms.

Further data on user counts, geographic distribution, and market-specific breakdowns for the June period had not been publicly disclosed at the time of reporting.