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Kalshi puts up $1B perfect-bracket prize as MLB names Polymarket partner
Kalshi launched a U.S.-only promotion tied to the 2026 NCAA Men's Basketball Tournament, offering $1B for a "perfect bracket" that correctly calls all 63 games, with entries due before the first tip-off on March 19, 2026. Separately on March 19, 2026, MLB named Polymarket its Exclusive Prediction Market Exchange Partner and said it signed an MOU with the CFTC aimed at safeguarding the integrity of baseball-related prediction markets.