Kalshi, a US‑based prediction‑market platform, recorded 15.4 million visits from the United States in July, according to Similarweb estimates. That represents a 1,520% rise from just under 1 million visits in August 2025 and pushed the share of US traffic to nearly 80% of total visits, up from 72.8% a year earlier.
The traffic surge coincides with a sharp expansion in trading activity. Kalshi’s monthly notional trading volume reached roughly $40 billion in August, up from $874 million a year earlier – an increase of about 4,500%. Across the broader prediction‑market sector, monthly notional volume grew to $50.7 billion from $2 billion, with Kalshi accounting for almost 79% of the latest total.
Sports contracts dominate the platform’s activity, comprising 83% of July’s trading volume, according to Barron’s. The growth occurs as Kalshi confronts legal disputes over whether its sports contracts fall under federal securities regulation or state gambling law. New Jersey has taken the issue to the US Supreme Court, heightening regulatory pressure.
International traffic also rose, though its share fell. Canada generated about 450,000 visits in July, up from roughly 50,000 in August 2025, while the UK logged 296,000 visits, up from 31,000. Both jurisdictions prohibit direct access under Kalshi’s member agreement. In June, Kalshi partnered with Canadian financial‑services firm Wealthsimple to offer around 4,000 eligible contracts through a separate app.
Kalshi did not respond to requests for comment on the traffic from restricted jurisdictions.
