Kalshi, Polymarket post first monthly trading volume drop in a year

Combined August trading volume at prediction markets Kalshi, Polymarket and PolymarketUS fell 14.5% from a month earlier to $45.33 billion, marking the first month-over-month decline in a year, The Block reported. Kalshi accounted for about 82% of the total with $37.17 billion in volume, while Polymarket and PolymarketUS posted a combined $8.16 billion. The combined figure had climbed above $50 billion in July before turning lower in August.