Robinhood's self-built compliant prediction market, Rothera, performed quite well during the World Cup. Single-day nominal trading volume hit a record high of $167 million, quickly becoming the third-largest market by trading volume, just behind Polymarket and Kalshi. Open interest grew from $0 to over $120 million in the past month, showcasing Robinhood's channel advantage as a top-tier online brokerage. Robinhood now has Kalshi integration and Rothera. Previously, the revenue split with Kalshi was roughly $0.01 (Robinhood) + $0.01 (Kalshi). Now, Rothera is a self-owned JV, with Robinhood acting as the distributor + majority shareholder, taking the lion’s share of the fees. Based on this single-day estimate, Rothera could potentially bring Robinhood over $150 million in additional annualized revenue.