Polymarket's trading volume declined 35% to $8.41B in August amid post-event market lull, while competitor Kalshi held steady at $38.67B.
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Polymarket's trading volume contracted to $8.41 billion in August, representing a 35% decline from July, as the surge in prediction market activity tied to earlier summer sports events subsided. The platform's core product bore the brunt of the pullback, falling from $7.89 billion to $4.59 billion month-over-month, while its separate US offering declined more modestly. By contrast, rival Kalshi posted a comparatively flat performance, closing August at $38.67 billion and maintaining roughly five times Polymarket's monthly volume.
The disparity reflects how unevenly the market slowdown has affected the two largest platforms in the space. According to data compiled by The Block, prediction market volumes surged to a peak of $5.6 billion during the World Cup but have since retreated, with weekly industry volume in early September running around $4 billion. The pullback follows a seasonal pattern typical of event-driven trading markets once marquee fixtures conclude.
Despite the volume contraction, investor appetite for the sector has not cooled. Polymarket secured $1 billion in fresh funding that values the platform at $21 billion, marking a 40% increase from its earlier valuation. Both Polymarket and Kalshi continue to face legal challenges, including lawsuits alleging unlicensed sports betting operations, though the regulatory pressure has not prevented capital deployment in the space.