Between September 7-13, 2026, Polymarket’s NFL contracts surged approximately 4,399% week-over-week to $27.62 million on its Global platform, while the US platform posted a 1,760% gain to $23.20 million. Total sports trading volume on Polymarket rose 104.7% to approximately $499 million. Combined with US rival Kalshi, the prediction sports market hit roughly $14.1 billion in weekly volume. Within months of launching US operations in late 2025, Polymarket captured 43.8% of Kalshi’s football trading volume. Temporary platform outages during peak trading periods represent an immediate operational challenge.
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