Polymarket has secured a multi-year partnership with Major League Soccer (MLS), becoming the exclusive prediction market partner for the league's regular season, All-Star Game, MLS Cup, and Leagues Cup in North America. This agreement, announced by MLS's commercial division, Soccer United Marketing, requires Polymarket to use official league data and third-party integrity monitoring systems. The platform is prohibited from offering markets on events deemed susceptible to manipulation or involving insider information. This partnership follows similar agreements Polymarket has with the National Hockey League (NHL) and the Ultimate Fighting Championship (UFC). While the exclusive authorization allows Polymarket to enhance its service quality with official data, it does not prevent other platforms from offering related markets, as state-level licensing governs the legality of sports betting in the U.S. The deal highlights the growing intersection between prediction markets and sports betting, with Polymarket and competitors like Kalshi vying for dominance in this expanding sector.