Major League Baseball Commissioner Rob Manfred said MLB is considering working with prediction market platforms to strengthen sports integrity. He told team owners that prediction markets operate under a different regulatory framework from state-regulated sports betting.
A potential MLB partnership could shape how prediction platforms and sports leagues address integrity safeguards.
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Major League Baseball sent players a memo dated 26 August 2025 prohibiting them from risking money on baseball-related prediction markets, reportedly citing existing betting rules. The memo came from the commissioner’s office and the players’ union; three players told the report they had not received communication about the restriction.
The NBA said it signed agreements with the CFTC, Kalshi and Polymarket to establish a framework for NBA-related prediction markets. The framework includes limits on permitted markets, restrictions on trading by league and team personnel, and information-sharing on investigations and suspicious trading.
Agreements with the Commodity Futures Trading Commission, Kalshi and Polymarket have been signed by the NBA, the league said. Under the framework, the league said, permissible markets are limited, league and team personnel are barred from trading, and information is shared on investigations and suspicious trading.
The NBA has reportedly agreed measures to establish integrity rules for prediction markets linked to the league. The available text says the measures include a memorandum of understanding but does not identify the other party.
The US Commodity Futures Trading Commission and the National Hockey League signed a memorandum of understanding on prediction-market integrity, according to the report. They will share information and coordinate on event contracts tied to professional hockey. It is the CFTC’s second agreement with a US professional sports league.
ESMA warned that rapidly growing prediction markets pose risks to investors and market integrity. The report names Polymarket and Kalshi as examples of these platforms.