Polymarket · The Block
Kalshi and Polymarket’s combined volume falls 15% in August, first monthly decline in a year
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Kalshi and Polymarket saw their combined volume decline last month, the first month-over-month drop in a year, following a World Cup-driven surge.
Key facts
- Specifically, Kalshi recorded $37.17 billion in volume in August, down 7.3% from $40.1 billion in July, while Polymarket and its U.S. platform saw a combined $8.16 billion, down 36.7% from $12.89
- s data dashboard, the combined monthly volume at Kalshi, Polymarket and Polymarket US fell 14.5% in August to $45.33 billion, marking the first decline since August 2025
- The August pullback followed a summer spike in prediction market activity driven by the World Cup, which ran from June 11 to July 19
- Santos violated its rules by trading a bet on whether he would attend the State of the Union, and was ordered to pay a fine of over $71,000
Summary
Kalshi and Polymarket saw their combined volume decline last month, the first month-over-month drop in a year, following a World Cup-driven surge. 's data dashboard, the combined monthly volume at Kalshi, Polymarket and Polymarket US fell 14.5% in August to $45.33 billion, marking the first decline since August 2025. Specifically, Kalshi recorded $37.17 billion in volume in August, down 7.3% from $40.1 billion in July, while Polymarket and its U.S. platform saw a combined $8.16 billion, down 36.7% from $12.89 billion in July. The August pullback followed a summer spike in prediction market activity driven by the World Cup, which ran from June 11 to July 19. Meanwhile, both Kalshi and Polymarket are facing increased scrutiny from state regulators in the U.S., particularly over sports-related contracts.