Meta description: Polymarket’s MLB-linked promotions are expanding as Tennessee, Nevada, Minnesota and federal courts test sports-event contract law.
Tags: Polymarket, MLB, CFTC, Kalshi, Tennessee, Nevada, Minnesota
market_platform: Polymarket
category: Regulation
Polymarket’s push into baseball promotion is arriving inside a fractured U.S. legal map. MLB named Polymarket its official prediction market exchange on March 19, 2026, while Tennessee ordered Polymarket to stop offering sports-event contracts, Nevada obtained a state-court injunction against the company, and Minnesota’s attempted ban was blocked by a federal preliminary injunction.
What did MLB give Polymarket?
Major League Baseball announced on March 19 that Polymarket would become MLB’s official prediction market exchange under an exclusive partnership. In the same announcement, MLB said Polymarket and its brokers would receive access to MLB marks and logos for prediction market products, along with official league data from Sportradar, MLB’s distributor of data for prediction markets.
The deal also put Polymarket inside MLB’s commercial and integrity framework at the moment sports-event contracts are drawing scrutiny from state gambling regulators. MLB said the partnership would include brand exposure across the league’s digital ecosystem and at league events. Bloomberg Law separately reported on March 19 that the deal gave Polymarket promotional space on MLB’s website and at MLB games.
MLB also signed a memorandum of understanding with the Commodity Futures Trading Commission. The league’s March 19 announcement said Commissioner Robert D. Manfred Jr. and CFTC Chairman Michael S. Selig signed the MOU to share information on baseball integrity and related prediction markets. MLB said the Polymarket agreement would restrict markets tied to integrity-sensitive events, including individual pitches, manager decisions and umpire performance.
That structure matters because Polymarket’s sports marketing is no longer just a platform-growth tactic. It now sits beside a league-level data and integrity arrangement, while state regulators argue that sports-event contracts still look like unlicensed wagering when offered to residents inside their borders.
How are Polymarket promotions reaching sports fans?
Polymarket promotions are appearing in mainstream sports-betting and sports-media coverage tied to baseball and football. New York Post betting coverage published on August 16 promoted code NYPMAX1 with a deposit-and-bonus offer around an MLB National League champion market. A second New York Post item on August 17 used the same code around an NFL Rookie of the Year market.
Those articles also show how platforms are trying to manage state restrictions in consumer-facing marketing. The August 17 New York Post promotion said the offer was available in most U.S. states but excluded Arizona, Illinois, Massachusetts, Maryland, Michigan, Montana, Nevada and Ohio. That exclusion list is not a legal map, but it reflects the practical pressure from state enforcement and geofencing decisions.
Public coverage of Polymarket’s affiliate program supports that the company has offered partners up to 30 percent of trading revenue. The publicly visible promotion language does not, by itself, establish that any specific article or code was reviewed by the CFTC. The relevant regulatory fact is narrower: the CFTC lists QCX LLC, doing business as Polymarket US, as a designated contract market as of July 9, 2025.
Where are states pushing back against Polymarket?
Tennessee moved first against Polymarket after its U.S. relaunch. The Tennessee Sports Wagering Council sent cease-and-desist letters dated January 9, 2026, to Kalshi, Polymarket and Crypto.com’s North American Derivatives Exchange, according to copies published through public-records requests and reported by multiple outlets. The letters ordered the platforms to stop offering sports-event contracts to Tennessee customers, void pending contracts and refund customer deposits by January 31.
Nevada has gone further in state court. Nevada Attorney General Aaron D. Ford announced on June 3 that a First Judicial District Court judge had said he would grant the state’s motion for a preliminary injunction against QCX LLC, the Polymarket entity. The attorney general’s office said Polymarket would not be allowed to offer sports-, election- or entertainment-related event contracts in Nevada while the enforcement case continued.
The Nevada Gaming Control Board’s public timeline lists a January 16 enforcement action against Polymarket, a January 29 temporary restraining order, and a May 29 state-court injunction barring Polymarket from offering prohibited event contracts in Nevada. The board’s timeline also lists parallel actions involving Kalshi, Coinbase, Crypto.com and Robinhood, showing that Nevada’s enforcement posture is aimed at the category, not only one exchange.
Minnesota is different because the state law has not taken effect. Governor Tim Walz’s office said on July 28 that a federal judge had issued a preliminary injunction blocking Minnesota from implementing a law banning prediction markets. The governor’s release said the legislation had been scheduled to take effect August 1 and would have made Minnesota the first state to ban the platforms. After the injunction, Walz signed an executive order barring state employees from using nonpublic or confidential information obtained through state work to participate in prediction markets.
Is the federal preemption argument winning or losing?
The answer depends on the court. Prediction market exchanges have argued that the Commodity Exchange Act gives the CFTC exclusive jurisdiction over swaps traded on designated contract markets and preempts state gambling enforcement against CFTC-regulated sports-event contracts. State regulators have answered that sports-event contracts are sports wagers and remain subject to state gambling law.
The most important appellate ruling so far favored Kalshi. On April 6, 2026, the U.S. Court of Appeals for the Third Circuit held in KalshiEX LLC v. Flaherty, No. 25-1922, that Kalshi had shown a reasonable chance of success on its argument that the Commodity Exchange Act preempts New Jersey’s regulation of its sports-event contracts. The Third Circuit said Kalshi’s sports-related event contracts fit within the Act’s definition of swaps traded on a CFTC-licensed designated contract market.
A federal court in Arizona also sided with the CFTC. On May 5, Judge Michael T. Liburdi of the U.S. District Court for the District of Arizona granted the CFTC’s motion for a preliminary injunction in litigation involving Arizona’s enforcement against Kalshi. The order said federal law preempts state gambling laws insofar as they seek to regulate derivatives exchanged on CFTC-regulated markets.
Other courts have reached the opposite result. In New York, U.S. District Judge Analisa Torres denied Kalshi’s request for a temporary restraining order and preliminary injunction on July 7, 2026, in KalshiEX LLC v. Williams, No. 1:25-cv-08846. The opinion found that New York gambling laws, as applied to Kalshi’s sports-event contracts, were not preempted by the Commodity Exchange Act.
Connecticut added another ruling against Kalshi on August 10. U.S. District Judge Vernon D. Oliver denied Kalshi’s request for a preliminary injunction in KalshiEX LLC v. Cafferelli, No. 3:25-cv-02016, according to the District of Connecticut docket and contemporaneous court coverage. The ruling opened the door for Connecticut officials to proceed with enforcement rather than immediately blocking the state.
Polymarket is not a party to the Kalshi cases in New York, Connecticut, New Jersey, Arizona or Tennessee. The relevance is that Polymarket US is relying on the same federal market structure, designation as a CFTC-regulated contract market, while states test whether that designation prevents gambling regulators from enforcing state restrictions against sports-event contracts.
Why does this matter for MLB-linked marketing?
The MLB relationship gives Polymarket a sports-rights partner, official league data access and a route into baseball-facing media. The legal fight determines where that commercial strategy can operate without state enforcement risk. A promotion that is straightforward in one jurisdiction may be unavailable or contested in another.
That tension is visible in the current promotion language. The New York Post’s August 17 Polymarket promotion listed several excluded states, including Nevada, Michigan, Maryland, Massachusetts, Arizona and Ohio. Tennessee’s cease-and-desist letter remains a separate enforcement marker. Minnesota’s statute was blocked before its August 1 effective date, leaving the state’s attempted ban in litigation rather than in force.
The result is not a clean national launch environment. It is a state-by-state compliance problem sitting on top of unresolved federal preemption litigation. For MLB, the issue is also reputational and operational: the league has put its marks, data and integrity framework next to an exchange whose sports-market access is still being litigated in multiple jurisdictions.
What is the next legal milestone?
The next concrete milestone is the next appellate ruling on federal preemption, because district courts have already split on whether state gambling regulators can block CFTC-regulated sports-event contracts. The Ninth Circuit heard argument on April 16, 2026, in appeals tied to Nevada prediction-market enforcement, according to the Arizona federal order.
Polymarket also has a direct appeal pending in the Sixth Circuit. The docket in QCX LLC v. Nessel, No. 26-1552, shows Polymarket appealing a Michigan preliminary-injunction loss filed in June. Kalshi’s Connecticut and New York rulings remain part of the developing Second Circuit landscape, while the Third Circuit’s New Jersey decision stands as the clearest appellate win for the preemption theory.
Until those appeals clarify the reach of CFTC preemption, Polymarket’s MLB-linked growth strategy will keep running through two tracks at once: national sports promotion through a federally designated market structure, and state-by-state litigation over whether sports-event contracts can be treated as illegal gambling inside individual states.
