Kalshi and Polymarket Trading Volume Reaches $53B in July

Kalshi and Polymarket, the two dominant prediction-market platforms in the United States and globally, reported a combined trading volume of US$53 billion in July 2026, as mounting interest in U.S. midterm election contracts drove a concentrated surge of activity across both platforms ahead of November polling dates. The figure, reported ahead of the 2026 midterm cycle, underscores how political-event-driven demand has transformed prediction markets from niche speculation venues into high-liquidity platforms processing volumes that rival mid-tier derivatives exchanges.