LeBron James is now the face of פולימרקט. On Tuesday, September 8, 2026, the crypto-native prediction-market platform released a roughly 90-second commercial starring the Philadelphia 76ers forward, and by the close of the day it had climbed to No. 1 among free finance apps on the US App Store. James signed on as a promotional partner three days after teasing the deal on X, and he does so as the first individual NBA player to align directly with the company.
The launch turned a 14-second tease into a full campaign. Over Labor Day weekend, on September 5, James posted a short clip built around a "פולימרקט HQ" elevator concept, captioned "Welcome to פולימרקט HQ. Coming soon." Three days later the real thing arrived: an all-star spot, a wave of new sign-ups, and a chart-topping app.
An all-star ad, directed by Peter Berg
The commercial was directed by Peter Berg, the filmmaker behind "Friday Night Lights" and a string of sports-inflected dramas, and it leans hard into the start of the NFL season. Alongside James it features Eli Manning, the two-time Super Bowl-winning former New York Giants quarterback; Richard Sherman, the former All-Pro cornerback; Derek Jeter, the New York Yankees Hall of Famer; the actor John Leguizamo; and the filmmaker Spike Lee.
The tone is fast and knowing. "It's live trading, you gotta stay on your toes," Leguizamo says in the spot, a line that doubles as the pitch: פולימרקט wants the reflexes and the fandom of sports, channeled into contracts on real-world outcomes rather than a static portfolio.
פולימרקט said it had signed James, Jeter and Manning together as promotional partners, a bench of American sporting royalty assembled to sell one idea, that following a game and taking a position on it are the same muscle.
James walks over from DraftKings
James arrives at פולימרקט straight from the other side of the industry. His endorsement deal with DraftKings, the sportsbook and daily-fantasy operator, expired in the summer of 2026, and rather than renew inside the betting world he crossed into prediction markets, where a price is framed as the crowd's probability rather than a bookmaker's line.
The timing sits inside a strange season for James off the court, too. In July 2026 he announced he would join the Philadelphia 76ers for his 24th NBA season, reportedly on a two-year contract worth about $8 million with a player option, a steep drop from the more than $50 million he commanded in his final Lakers years. For a player long defined by leverage, the פולימרקט deal reads as part of a wider pivot from playing income to platform equity and brand building.
No. 1 on the US App Store
The commercial did its job in hours. By Tuesday, פולימרקט ranked No. 1 among free finance apps in the US App Store, ahead of its direct rival קלשי and ahead of mainstream money apps including Capital One Mobile, PayPal and Venmo. For a platform that only recently secured a path back into the US market, sitting atop the finance chart on the day the NFL season kicks off is the clearest signal yet of how much reach a single celebrity drop can buy.
The NFL framing was deliberate. The campaign points traders at football markets on the season's biggest questions, from the opener onward.
Squads, and the social turn
פולימרקט paired the celebrity launch with a product: Squads, a new social-trading feature that lets friends follow one another into the same events. Travis VanderZanden, the company's chief growth officer, framed it as putting "the conversation and trading together so friends can follow the events they care about." The logic is the same as the ad's: convert group-chat sports arguments into shared positions on the platform.
It is also a competitive answer. The prediction-market race is no longer only about which contracts exist; it is about which app owns the social layer where fans already argue, and Squads is פולימרקט's move to own it.
What James's role actually is
One thing the launch did not resolve is exactly what James is to פולימרקט. The company presented him as a promotional partner, and some accounts describe him as an investor plus a marketing and live-events partner, mirroring the arrangement Giannis Antetokounmpo struck with קלשי. Others frame him strictly as an endorser. CNBC reported that James's precise role had not been revealed, and פולימרקט has not disclosed the deal's financial terms, its length, or whether James holds any equity stake. What is confirmed is the marketing partnership; the investor question is, for now, unconfirmed.
The celebrity arms race with קלשי
The signing is the loudest shot yet in a bidding war for famous faces. קלשי, the federally regulated US prediction market that is פולימרקט's closest competitor, has leaned on its own roster, including Antetokounmpo and the footballer Lionel Messi. פולימרקט's answer is a bigger, splashier cast and a director with real Hollywood range, a statement that it intends to win the mainstream-attention contest, not just the trading-volume one.
Behind the star power is a market-share push. פולימרקט is racing to expand its US footprint, and topping the App Store on NFL opening day, ahead of קלשי, is exactly the kind of proof point it wants investors and traders to see.
The one party that has not spoken
The campaign lands into an unsettled legal picture. פולימרקט's sports event contracts face state-level legal challenges even as the platform expands, and James is not a retired ambassador but an active player, fronting a speculation product while the NBA maintains rules about players' financial ties to betting and betting-adjacent businesses. קלשי navigated a version of this with Antetokounmpo; פולימרקט now has the bigger name and the bigger target on its back. The App Store number is settled. Whether the league, and the regulators still weighing those sports contracts, are comfortable with the NBA's most famous active player selling prediction markets during a season he is playing is the question this campaign has just forced into the open.
