MLB and Polymarket: A New Play in Prediction Markets

Major League Baseball (MLB) has entered the rapidly evolving world of prediction markets, announcing a partnership with Polymarket as its official prediction market exchange partner. This move, coupled with a memorandum of understanding (MOU) with the Commodity Futures Trading Commission (CFTC), signals a proactive approach to managing risk and engaging fans in a novel way.

A Landmark Partnership

The partnership, announced on March 19, 2026, grants Polymarket and its brokers exclusive access to MLB logos and official data, alongside brand exposure across league events . MLB Commissioner Robert D. Manfred, Jr. Signed the MOU with CFTC Chairman Michael S. Selig, building on a previous letter from MLB calling for stronger integrity protections in the prediction market space .

What are Prediction Markets?

Prediction markets allow users to bet on the outcomes of events – not just in sports, but too in politics and other areas – by buying and selling contracts, functioning similarly to a stock exchange. But, their legal status differs from traditional sports gambling, leading to ongoing legal challenges in several states .

Focus on Integrity

A central tenet of the agreement is a “comprehensive integrity framework.” MLB and Polymarket will collaborate to restrict markets that could compromise the integrity of the game, such as those focused on individual pitches, manager decisions, or umpire performance . Polymarket will also integrate integrity controls into its US Rulebook to ensure consistent standards for all brokers. The CFTC and MLB have a “clear intent” to share information related to prediction markets .

Addressing Concerns and Parallels to Sports Gambling

MLB’s move mirrors a trend among major sports leagues, with the National Hockey League and Major League Soccer also partnering with prediction markets . This approach is similar to the leagues’ embrace of traditional sports gambling after the 2018 Supreme Court ruling that overturned a federal ban, strategically adapting to a changing legal landscape.

Navigating Legal Challenges

The partnership comes amidst legal scrutiny. Arizona’s attorney general recently filed criminal charges against Kalshi, a Polymarket rival, alleging illegal gambling operations . Polymarket itself is currently suing Michigan . These legal battles highlight the ongoing debate over how prediction markets should be regulated.

Looking Ahead

MLB’s partnership with Polymarket represents a significant step in navigating the complexities of prediction markets. By prioritizing integrity and collaborating with regulators, the league aims to protect the game while offering fans new engagement opportunities. The CFTC is also in discussions with other major sports leagues to establish similar frameworks, suggesting a broader industry shift towards embracing this emerging form of fan engagement .