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MLB Strikes Deals with Polymarket, Federal Watchdog as Prediction Markets Boom

  • Major League Baseball announced today that it has named Polymarket as its official prediction market partner and signed an information-sharing memorandum with the Commodity Futures Trading Commission.
  • Facing growing legal pressure, leagues moved to formalize rules as prediction markets surged over the past year, with Arizona Attorney General Kris Mayes charging Kalshi and last year’s indictment of two Cleveland Guardians pitchers increasing urgency.
  • The agreement establishes a comprehensive integrity framework, and under the memorandum, designated representatives will meet regularly to share confidential information, MLB Commissioner Rob Manfred said, 'Protecting the integrity of the game on the field is our top priority'.
  • Polymarket will gain exclusive branding and data rights while the league retains ties to other prediction market exchanges that must adopt integrity protections; the deal may be voided if courts rule against prediction markets under state law.
  • Following similar deals by the National Hockey League and Major League Soccer, the partnership signals broader league adoption and involves the CFTC, with Selig stating 'the collaboration helps the commission add tools to protect markets.
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KARE broke the news in Minneapolis, United States on Thursday, March 19, 2026.
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