World Cup Boost Fades-Kalshi and Polymarket Feel It

TLDR

• Kalshi and Polymarket combined volume fell 14.5% in August to $45.33 billion.
• The decline marked the first month-over-month drop in prediction market volume since August 2025.
• Kalshi recorded $37.17 billion in August volume, down 7.3% from July.
• Polymarket and Polymarket US volume dropped 36.7% to a combined $8.16 billion.
• The slowdown followed strong World Cup-driven trading activity during June and July.

Kalshi and Polymarket recorded a sharp drop in combined trading volume in August, ending a year-long run of monthly growth. Total volume across Kalshi, Polymarket, and Polymarket US fell 14.5% to $45.33 billion, according to The Block’s data dashboard.

The decline followed July’s record $50.59 billion in combined volume. Activity had surged during the FIFA World Cup, which ran from June 11 to July 19 and drove strong demand for sports prediction contracts.

Kalshi and Polymarket Volume Falls in August

Kalshi posted $37.17 billion in August trading volume, down 7.3% from $40.1 billion in July. Polymarket and Polymarket US recorded $8.16 billion combined, a 36.7% decline from $12.89 billion.

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