Riot Games Opens Polymarket and Kalshi Sponsorship Talks — With One Catch

Riot Games, the publisher behind League of Legends and Valorant, is talking to Polymarket and Kalshi about bringing prediction markets into its esports events. The Riot Games Polymarket Kalshi sponsorship talks were first reported by Bloomberg on September 10, 2026. It is the first time a major game publisher has openly discussed letting a prediction…