Major prediction market platform Kalshi has seen its U.S. web traffic rise sharply over the past year, highlighting rapid growth as regulators and courts examine its expanding event-contract business. According to Cointelegraph, Kalshi recorded 15.4 million visits from the United States in July, up about 1,520% from just under 1 million in August 2025, based on Similarweb traffic estimates reviewed on Friday. U.S. traffic made up nearly 80% of Kalshi’s total traffic in July, compared with 72.8% in August 2025, showing that the platform’s growth remained heavily concentrated in the country. The increase comes as Kalshi faces legal challenges over whether its sports contracts fall under federal oversight or state gambling laws, with New Jersey taking the dispute to the US Supreme Court.
Kalshi’s traffic growth has been accompanied by even faster expansion in trading activity. According to Cointelegraph, the platform recorded about $40 billion in monthly notional trading volume in August, up from $874 million a year earlier, an increase of roughly 4,500%, according to a Dune Analytics prediction market data dashboard. Across the prediction-market industry, monthly notional volume rose to $50.7 billion from about $2 billion over the same period, with Kalshi accounting for nearly 79% of the latest total. Barron’s reported Thursday that sports contracts made up 83% of Kalshi’s trading volume in July. Kalshi also drew more traffic from jurisdictions where its member agreement currently restricts direct access or trading. Canada generated about 450,000 visits to Kalshi’s website in July, up from roughly 50,000 in August 2025, while UK traffic increased to 296,000 from 31,000. From August 2025 to July 2026, Canada’s share of Kalshi’s traffic fell to 2.3% from 3.8%, while the UK’s share declined to 1.5% from 2.4%, even as visits from both countries increased. Kalshi partnered with Canadian financial services company Wealthsimple in June to provide access to nearly 4,000 eligible Kalshi contracts through a separate app. Cointelegraph contacted Kalshi for comment on the traffic from restricted jurisdictions but had not received a response by publication.
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