LeBron James Partners with Polymarket as Prediction Markets Gain Traction

A video posted by LeBron James on X announced his partnership with Polymarket, with the prediction market platform set to disclose full details on Tuesday.

In the clip, James is seen inside an elevator at what he describes as Polymarket headquarters. He passes buttons labeled politics, crypto, economy, culture, weather, esports and technology before stepping out onto the sports floor.

LeBron James Polymarket Deal Follows DraftKings Exit

Welcome to Polymarket HQ. Coming soon. 👀

In partnership with @Polymarket pic.twitter.com/bNe5s1IkdO

— LeBron James (@KingJames) September 5, 2026

James previously endorsed the sportsbook DraftKings from 2024 until that agreement concluded earlier this summer. He appeared at Polymarket a few weeks afterward.

The shift is significant as prediction markets are increasingly drawing bets away from traditional sportsbooks. Monthly sector volume surpassed $20 billion by January, a sharp rise from roughly $1.2 billion in early 2025. James himself became a subject of betting this summer, with wagers on his next team generating over $245 million in volume.

NBA regulations constrain what James can promote. Players are permitted to endorse prediction markets but are prohibited from pushing contracts related to NBA games. The NFL and PGA Tour have reportedly banned such deals entirely.

Other athletes have preceded him in this space. Giannis Antetokounmpo became a Kalshi shareholder earlier this year, heightening the competition between the two platforms.

Sports leagues have also entered the arena. Polymarket became Major League Baseball's official prediction market provider, while the NHL reached agreements with both operators in October 2025.

Legal Fights Shadow the Sports Betting Boom

Nevertheless, cities and states have resisted. Baltimore filed a lawsuit against both operators in August, labeling them unlicensed sportsbooks. New York sued Kalshi in July for more than $36 billion. These cases are part of a broader dispute over sports contracts.

Investors have largely ignored the legal pressure so far. In April, Polymarket sought $400 million at a $15 billion valuation, well above the $9 billion it commanded the previous October. Intercontinental Exchange, owner of the New York Stock Exchange, has pledged $2 billion to the company.

Meanwhile, Polymarket continues to expand its offerings beyond politics and sports. The platform introduced Pokemon card markets in August.

Specific terms of the deal have not been disclosed. Nonetheless, the LeBron James Polymarket campaign arrives at the start of football season, and the coming weeks should reveal whether star appeal can turn curious fans into active traders.