The prediction market platform Kalshi is demonstrating phenomenal 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.—this is more than a 16-fold increase compared to August 2025, when the audience barely reached 1 million users. Notably, American traffic now accounts for nearly 80% of the platform's total visits, highlighting its dominance in the local market.
However, the dynamics of trading activity look even more impressive. Kalshi's trading volume in August soared to approximately $40 billion, whereas a year earlier this figure did not exceed $874 million. This represents growth of more than 45 times—a pace that places Kalshi alongside the largest derivatives exchanges in terms of liquidity in certain niches.
Sports contracts as the main driver
The key catalyst for this boom has been sports contracts, which accounted for 83% of the platform's total turnover in July. This is especially telling amid Kalshi's ongoing legal battles with regulators in individual U.S. states. Despite legal pressure, the platform is not only holding its ground but also expanding its user base, indicating strong demand for alternative hedging and speculation tools.
My expert perspective: Kalshi's rapid growth reflects a fundamental shift in the behavior of retail traders, who are increasingly viewing prediction markets as a full-fledged replacement for traditional exchange products. However, it is worth remembering that such exponential dynamics often attract regulator attention, and the current lawsuits may be just the beginning of broader pressure on the industry. Investors and market participants should closely monitor the development of the legal landscape, as any restriction on Kalshi's operations could trigger a sharp correction in volumes.