Combined trading volume for Kalshi and Polymarket fell 14.5% in August to $45.33 billion, marking the first meaningful pullback after months of sustained growth in the prediction markets sector. This decline followed a July record of $50.59 billion, fueled by the FIFA World Cup running from June 11 to July 19, which turbocharged sports betting contracts across both platforms. Sports contracts accounted for over 88% of recent activity on Kalshi, which contributed $37.7 billion in July, roughly 74.5% of the combined total. Despite the overall downturn, Kalshi hit a weekly record of $10.17 billion for the week ending August 30.
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