Stacy Muur(@stacy_muur):Kalshi became the official prediction-market partner of the US Open. It’s a multi-year partnership in which @Kalshi will be promoted both online and at US Open venues. Prediction markets made their way into mainstream sports, much like sportsbooks did before them. And Kalshi is already enormous, with roughly 3x @Polymarket’s 24h volume. I’d pay attention to the exclusivity here. Rival prediction markets are reportedly blocked from advertising at the tournament and across its ESPN broadcasts. Kalshi and Polymarket may end up racing to secure the biggest events.

2026.09.02 07:21

Kalshi became the official prediction-market partner of the US Open. It’s a multi-year partnership in which @Kalshi will be promoted both online and at US Open venues. Prediction markets made their way into mainstream sports, much like sportsbooks did before them. And Kalshi is already enormous, with roughly 3x @Polymarket’s 24h volume. I’d pay attention to the exclusivity here. Rival prediction markets are reportedly blocked from advertising at the tournament and across its ESPN broadcasts. Kalshi and Polymarket may end up racing to secure the biggest events.