Kalshi Sees 1,500% US Web Traffic Spike In Sharp Growth Under Scrutiny

TL;DR

• Traffic Explosion: Kalshi’s US visits hit 15.4 million in July, rising about 1,520% from August 2025 and strengthening its position during ongoing regulatory scrutiny.
• Volume Expansion: Monthly notional trading volume reached $40 billion, up from $874 million a year earlier, giving the platform nearly 79% of industry activity and showing faster growth than its traffic surge.
• International Shifts: Canada and the UK saw rising visits, though their overall share declined. Access remains restricted, with Canada gaining limited availability through a Wealthsimple partnership.
  

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Kalshi is experiencing one of the sharpest growth waves in the prediction‑market sector, with new traffic and trading figures highlighting how quickly the platform has expanded during a period of heightened regulatory attention. The company’s US audience has surged at a pace rarely seen in the industry, reinforcing its position as a dominant player even as courts and regulators examine the scope of its event‑contract business.

US Traffic Surge Signals Expanding Market Reach

Kalshi recorded 15.4 million US visits in July, a jump of roughly 1,520% from just under 1 million in August 2025, according to Similarweb estimates. Nearly 80% of Kalshi’s July traffic came from the United States, up from 72.8% a year earlier, showing that its growth remains heavily concentrated in the country.

The spike arrives during a period of mounting legal pressure. Regulators and courts are assessing whether Kalshi’s sports contracts fall under federal oversight or state gambling rules, with New Jersey escalating the dispute to the US Supreme Court. Even with that backdrop, the platform’s momentum has accelerated rather than slowed.

Trading Volume Growth Outpaces Traffic Expansion

Kalshi’s trading activity has grown even faster than its traffic. The platform recorded about $40 billion in monthly notional volume in August, up from $874 million a year earlier, an increase of roughly 4,500%, according to a Dune Analytics dashboard. Across the broader prediction‑market industry, monthly notional volume rose to $50.7 billion from about $2 billion, with Kalshi accounting for nearly 79% of the latest total.

Sports contracts represented 83% of Kalshi’s July trading volume, according to Barron’s, underscoring how central that category has become to the platform’s activity.

International Growth Continues Despite Access Limits

Canada generated about 450,000 visits to Kalshi in July, up from roughly 50,000 in August 2025. UK traffic increased to 296,000 from 31,000 over the same period. Both countries remain restricted jurisdictions under Kalshi’s member agreement, though a June partnership with Wealthsimple now provides Canadian users access to nearly 4,000 eligible contracts through a separate app. Even with rising visits, Canada’s share of Kalshi’s traffic slipped to 2.3% from 3.8%, and the UK’s share fell to 1.5% from 2.4%, reflecting how rapidly US growth has outpaced international gains.