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The big picture: Following Major League Baseball and the National Hockey League, the NBA has become the third major US sports league to sign commercial partnerships with both Kalshi and Polymarket, designating them as its "Preferred Prediction Market Exchanges." The MLS also has an exclusive partnership with Polymarket through its commercial arm, Soccer United Marketing.

The NBA said the multi-year deals would help establish a data-sharing framework to root out insider betting and other forms of corruption that have rocked the league on multiple occasions. These incidents have resulted in suspensions and federal indictments involving several prominent players and coaches, including Chauncey Billups, Terry Rozier, Jontay Porter, and others.

The agreements require both prediction market operators to share data with the league and investigative agencies to help identify suspicious betting patterns.…