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Polymarket secured a $300 million, four-year deal as Major League Baseball's exclusive prediction-market partner in the US and Canada in March 2026. By August 27, the platform had expanded through Sportradar to cover more than 20 leagues and approximately 300,000 matches per year. Then approximately 20 states filed or joined lawsuits arguing that prediction markets on sporting events constitute illegal gambling under existing state laws.
The collision is structural. Prediction markets operate under CFTC federal oversight as event contracts, not as state-regulated gambling products. States argue sports prediction markets function as sportsbooks and fall under their jurisdiction. The outcome determines whether platforms like Polymarket can continue operating in states with legal sports betting, states without it, or neither.
The Volume Gap
Combined monthly global trading volume on prediction markets hit about $50.6 billion in July 2026. Legal U.S. sportsbooks handled about $14 billion per month in 2025.
That three-fold difference matters to state regulators who license sportsbooks, collect tax revenue from gross gaming revenue (GGR), and enforce responsible gambling requirements. Prediction markets pay none of that. No state gaming tax. No self-exclusion system integration. No deposit limits tied to state databases.
The platforms argue they're not offering gambling because users trade event contracts, not placing wagers against a house. States argue the user experience is identical: you put money on an outcome, and if it happens, you get paid. The legal theory matters less than the user flow, and the user flow looks like sports betting.
Minnesota's Failed Ban and the Federal Block
Minnesota became the first state to sign a law banning prediction markets on May 18, 2026. The law would have made it a felony to host, advertise, or provide supportive services for platforms like Kalshi or Polymarket within the state, effective August 1.
A federal judge blocked it from taking effect.
The block created the pattern now playing out in 19 other states. State legislatures pass bans or enforcement actions. Federal courts pause them pending CFTC jurisdiction arguments. The platforms continue operating while the cases move through district courts, then appeals. The timeline stretches into 2027 or 2028 before circuit-level clarity.
During that window, the platforms are expanding partnerships. Sportradar's deal brings in the NBA, NHL, international football leagues, cricket, and esports. The commercial infrastructure is being built faster than the regulatory framework can settle.
The Insider Trading Referral
Polymarket referred dozens of accounts showing signs of potential military insider trading to the Justice Department for investigation. The referral followed unusual betting patterns on geopolitical and defense-related event markets, not sports.
The move signals the platform's approach to regulatory exposure: cooperate early, document the referral, and position the company as part of the enforcement process rather than its target. It also highlights a risk traditional sportsbooks don't face. Sports outcomes are public and scheduled. Geopolitical events and defense decisions are not. The risk of insider information driving contract prices is higher, and the platform's liability for facilitating that activity is unsettled.
State lawsuits mention this risk as part of their argument. If prediction markets can be manipulated by insiders with non-public information, they're not just unlicensed gambling products. They're unregulated securities trading venues with embedded market-integrity problems.
What Licensed Sportsbooks Are Watching
Licensed operators in states like New Jersey, Pennsylvania, and Nevada pay annual license fees, submit to audits, contribute to responsible gambling programs, and operate under deposit limits and self-exclusion requirements. Casino and sportsbook operators in regulated markets face compliance costs that prediction markets currently avoid.
If Polymarket and Kalshi win the jurisdictional fight, licensed sportsbooks face a competitor with lower cost structure and no responsible gambling obligations. If states win, prediction markets either get licensed under the same framework (unlikely, given the CFTC federal claim) or exit those states entirely.
The third option is the one the industry expects: a negotiated settlement where prediction markets accept some state oversight, pay a modified tax rate lower than sportsbook GGR rates, and integrate self-exclusion databases in exchange for operating permission. That's the path that keeps the MLB deal alive and gives states something to show for the fight.
The CFTC's Silence
The CFTC has not issued guidance clarifying whether state gambling laws apply to federally-regulated event contracts. The agency's silence leaves platforms and states in a holding pattern.
Polymarket operates under a 2022 settlement with the CFTC that required the platform to block U.S. users, then reversed that position after restructuring its compliance. Kalshi won a federal court case in 2023 affirming its right to offer event contracts under CFTC oversight. Neither ruling addressed state-level gambling prohibitions directly.
The longer the CFTC waits, the more the commercial deals (MLB, Sportradar, media partnerships) create facts on the ground that make an outright ban politically harder. State attorneys general know this. The lawsuits are moving faster than the federal rulemaking process.
Responsible Gambling Context and Player Protection
Prediction markets do not currently integrate with state-level self-exclusion systems like Betfilter, the National Council on Problem Gambling's database, or state-specific responsible gambling registries. Licensed sportsbooks in most states must check users against these lists and prevent excluded individuals from creating accounts.
Polymarket and Kalshi offer voluntary deposit limits, but they're platform-specific and not tied to cross-platform databases. A user who self-excludes from DraftKings in New Jersey can still trade on Polymarket with no friction. That gap is part of the state argument: if the product functions like sports betting for the user, it should carry the same player-protection obligations.
This matters most for high-frequency users. The platform's rapid expansion into sports leagues attracts the same user base as licensed sportsbooks, including users with gambling-harm histories. Without integration into existing harm-reduction infrastructure, the prediction market model bypasses a decade of responsible gambling framework development in the licensed industry.
The Takeaway
If you're using Polymarket or Kalshi for sports event contracts, understand that the legal status is unsettled and state-specific. The platform may continue operating during litigation, or it may geofence your state with little notice. The MLB partnership and Sportradar expansion suggest the company expects to win or settle, but the timeline is years, not months.
For operators and investors watching the space: the jurisdictional fight will determine whether prediction markets become a parallel sportsbook sector with lighter regulation, or whether they get folded into the existing state-by-state licensing framework. The volume gap ($50.6 billion versus $14 billion monthly) makes this a fight states won't drop quietly.
Frequently Asked Questions
Are prediction markets like Polymarket legal in the United States?
Polymarket operates under CFTC federal oversight as an event contract platform, not a state-regulated sportsbook. However, approximately 20 states have filed lawsuits arguing these platforms constitute illegal gambling under state law. A federal judge blocked Minnesota's ban in August 2026. The legal status is unsettled and varies by state while cases move through federal courts.
How do prediction market volumes compare to licensed sportsbooks?
Combined monthly global trading volume on prediction markets reached about $50.6 billion in July 2026, compared to about $14 billion per month wagered at legal U.S. sportsbooks in 2025. This three-fold volume difference is a key reason state regulators are pursuing enforcement, as prediction markets currently pay no state gaming taxes and face no responsible gambling requirements.
Do prediction markets have responsible gambling protections?
Prediction markets like Polymarket offer voluntary deposit limits but do not integrate with state-level self-exclusion systems that licensed sportsbooks must use. A user who self-excludes from a licensed sportsbook can still trade on prediction markets with no restrictions. This regulatory gap is part of the state argument that these platforms should face the same player-protection obligations as sportsbooks.
What was Polymarket's MLB deal worth?
Polymarket secured a $300 million, four-year deal in March 2026 to become Major League Baseball's exclusive prediction-market partner in the US and Canada. In August 2026, the platform expanded through Sportradar to cover more than 20 leagues and approximately 300,000 matches per year, building commercial infrastructure while state legal challenges remain unresolved.
Why did Polymarket refer accounts to the Justice Department?
Polymarket referred dozens of accounts showing signs of potential military insider trading to the Justice Department for investigation. The referral followed unusual betting patterns on geopolitical and defense-related event markets. This highlights a risk prediction markets face that traditional sportsbooks do not, since non-public information can influence contract prices on political and military events.
