In August, combined trading volumes on Kalshi, Polymarket, and Polymarket US dropped 14.5% to $45.33 billion. This marks the first monthly drop since August 2025.

Key Numbers

Out of the total, Kalshi handled $37.17 billion. Polymarket and its US platform accounted for $8.16 billion.

Summer Slowdown

The dip followed a summer spike in activity, fueled by the World Cup hype.

What It Means for the Market

This first drop in a year shows just how sensitive this sector is to major events: after the World Cup peak, volumes returned to a more typical pace. Where things go from here will depend on new headlines and the timing of big events.