The prediction market platform Kalshi is showing explosive growth that is hard to ignore. According to my analysis of Similarweb data, in July the site attracted 15.4 million unique visitors from the U.S., whereas a year earlier—in August 2025—that figure barely exceeded 1 million. Thus, American traffic has grown more than 16-fold, and users from the States now account for nearly 80% of the platform's total audience.
However, the dynamics of trading activity look even more impressive. Kalshi's trading volume in August reached approximately $40 billion, which is 45 times higher than last year's level ($874 million). This is not just a correction or a seasonal spike—it is a fundamental shift in how the platform is perceived as a legal tool for hedging and speculation.
Sports contracts as a driver
The key catalyst for growth has been sports contracts, which in July accounted for 83% of all Kalshi's turnover. Notably, this surge is occurring amid the platform's active legal battles with regulators in several U.S. states who are trying to restrict its operations. Nevertheless, the market is voting with money: investors and traders are increasingly viewing prediction markets as an alternative to traditional exchanges for betting on event outcomes.
My conclusion: Kalshi is turning into a systemically significant player in the prediction niche, and current growth rates indicate that the potential is far from exhausted. However, legal risks remain the main factor of uncertainty—if courts side with authorities, it could cool user enthusiasm. For now, the platform is confidently consolidating the market, and investors should closely monitor its development.