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Prediction Markets Hit $5.9B as Kalshi and Polymarket Set Combined Weekly Record

Summary by DeFi Rate
The headline number $5.89B across all tracked prediction market platforms for the week of March 2–8 looks like a near-repeat of the week prior, but that’s not exactly the case. The total came in virtually flat (-0.4% WoW) only because Kalshi and Polymarket each gained ground while the rest of the tracked field shed volume heavily. That includes Opinion Labs, which has shown a decline of 87% over five weeks. Strip out the smaller exchanges, and t…
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DeFi Rate broke the news in on Monday, March 9, 2026.
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