Kalshi, a prediction market platform where users trade contracts on future outcomes, recorded 15.4 million visits from the United States in July 2026, up about 1,520% from roughly 1 million in August 2025, according to Similarweb estimates reviewed by Cointelegraph. U.S. traffic represented nearly 80% of the platform's visits. Kalshi's monthly notional trading volume reached about $40 billion in August, compared with $874 million a year earlier, an increase of roughly 4,500%. The broader prediction-market sector recorded $50.7 billion in monthly notional volume, with Kalshi accounting for nearly 79%, according to Dune Analytics data. Sports-related contracts made up 83% of Kalshi's July trading activity, increasing the importance of a legal dispute that has reached the U.S. Supreme Court. New Jersey argues that sports event contracts should be regulated under state gambling laws, while Kalshi maintains they are federally regulated financial products. Canadian and U.K. traffic also rose despite Kalshi's restrictions on direct access and trading in both jurisdictions.