LeBron James joined a growing list of athletes teaming up with prediction market services Saturday, announcing a forthcoming partnership with Polymarket via social media.The Philadelphia 76ers star and future Hall of Famer’s partnership follows in the footsteps of stars such as Giannis Antetokounmpo, Bryson DeChambeau and Lionel Messi, all of whom revealed deals with Kalshi, a Polymarket competitor, earlier this year.James posted a 60-second video to his X account Tuesday showing a commercial that features him stepping off an elevator after pressing the floor for “sports.” The caption reads “Step inside Polymarket HQ” and features several retired athletes and celebrities such as Eli Manning, Rajon Rondo, Spike Lee, Alexandra Daddario, Emily Ratajkowski, Derek Jeter and others.
Step inside Polymarket HQ.
Somebody get the ice bath ready for @EliManning after that tackle. 🧊🤣🏈
In partnership with Polymarket pic.twitter.com/xfv1nr6OOb
— LeBron James (@KingJames) September 8, 2026Polymarket bills itself as the world’s largest prediction market. The platform allows people to trade on the outcomes of future events — including whether or not LeBron will play with his son, Bronny, during the 2026-27 season.
