Prediction Markets Kalshi and Polymarket See First Monthly Volume Decline in a Year

Combined trading volume for Kalshi, Polymarket, and Polymarket US fell 14.5% month-over-month to $45.33 billion in August, marking the first decline in a year. Kalshi's volume dropped 7.3% to $37.17 billion, while Polymarket and its US platform saw a 36.7% decrease to $8.16 billion. This pullback follows a surge in activity during the summer, though August figures remain significantly higher than May's $25.66 billion. Both platforms are facing increased scrutiny from US state regulators regarding sports-related contracts, with over a dozen states taking enf