Senate Bill Targets Kalshi and Polymarket Sports Contracts

Anyone who has ever shipped a sportsbook into a new jurisdiction knows the rule of thumb: the regulator you didn't plan for is the one that kills the roadmap. Kalshi and Polymarket spent two years building product on the assumption that a CFTC registration was a federal shield against state gambling law. On Monday, two senators introduced a bill that would turn that shield into a target.

The "Prediction Markets Are Gambling Act" is short, bipartisan, and surgical. It does not try to redefine what a swap is. It just tells CFTC-registered entities they cannot list sports or casino-style contracts. For platform teams at Kalshi, Polymarket, and every traditional iGaming operator watching from the sidelines, this is the most consequential US regulatory event of the year so far.

Key Details

As NBC News reported, the bill was co-sponsored by Sen. Adam Schiff, D-Calif., and Sen. John Curtis, R-Utah, and is described as the first bipartisan Senate legislation aimed at sports betting on prediction market services. Schiff's framing is blunt: "Sports prediction contracts are sports bets, just with a different name." He argues the contracts are offered in all fifty states "in clear violation of state and federal law."

The mechanics matter. Traditional sportsbooks live under state gambling regulators. Prediction markets sit under the Commodity Futures Trading Commission, created in 1974 and granted exclusive authority under the federal Commodity Exchange Act to regulate futures, options, and swaps for registered entities. Kalshi and Polymarket are both registered with the CFTC as designated contract markets. That status is exactly what the bill weaponizes. It would prohibit any CFTC-registered entity from listing any "agreement, contract, or transaction relating to any sporting event or athletic competition," and extends the ban to casino-style games like poker and blackjack.

Curtis brought the states' rights angle, citing "too many young people in Utah" exposed to addictive sports and casino-style contracts that "belong under state control, not under federal regulators."

Hours after the bill dropped, Kalshi announced it would preemptively block athletes, personnel, and referees from trading markets tied to their own sports, and bar politicians from trading on their own campaigns. Per the company, these changes had been in development for months and align with congressional proposals and CFTC guidance. Worth noting: Kalshi previously investigated suspicious trades after the fact, not in advance. That is a real engineering change, not a press release.

The numbers explain the urgency. Prediction markets cleared over $1.2 billion in trading on this year's Super Bowl Sunday and more than $4.5 billion across Super Bowl week. The Wall Street Journal pegged Kalshi's latest round at a $22 billion valuation, and Polymarket is reportedly chasing similar marks. Both companies have opened free grocery stores and trading-themed bars, including Polymarket's "Situation Room" in Washington, D.C., to acquire users.

Why This Matters for iGaming Operators

For licensed iGaming operators, this bill is the first real moment the regulatory arbitrage gets dragged into daylight. Every state-licensed sportsbook has been forced to swallow the cost stack of compliance: KYC, geofencing, responsible gambling tooling, state-by-state certification, tax remittance, and tribal compacts. Prediction markets shipped sports exposure nationwide without any of that, and acquired users with billion-dollar Super Bowl handles while doing it.

My take: the $4.5 billion Super Bowl-week number is the only number that mattered in moving this bill. That is roughly the GGR scale at which any state attorney general starts answering phone calls from licensed operators asking why they pay a 20% rate and a competitor pays zero. Arizona already moved, with prosecutors filing criminal charges alleging Kalshi runs an unlicensed gambling operation. Attorney General Kristin Mayes called the prediction-market framing exactly what it looks like from the state side: branding.

Operationally, the surveillance gap Kalshi just closed is what licensed sportsbooks have been doing for years. Pre-trade blocking of athletes, referees, and team personnel is standard at any operator under a serious license. The fact that this was bolt-on at a $22 billion company tells you how lean these platforms ran their integrity stack. Teams I've worked with on sportsbook integrity programs spend most of their compliance budget on exactly this: identity resolution, role-based blocking, market suspension feeds from data partners. None of that is glamorous and all of it is mandatory under UKGC or MGA regimes. The UK Gambling Commission would not have let any operator ship a sports product with "we investigate suspicious trades after the fact."

If you run a state-licensed book, the practical implication is straightforward: your competitive disadvantage may shrink. If you run a prediction market, your sports book line is potentially a write-off inside 18 months.

Industry Impact

The engineering implications cut deeper than a marketing pivot. Prediction markets built their settlement, risk, and order-book systems on the assumption that sports contracts are first-class citizens. Sports volume is what drove Super Bowl-week trading to $4.5 billion. Pulling that out of the platform, if the bill passes, is not a feature flag. It is a re-pricing of the entire venture thesis.

A few concrete consequences platform leads should think about:

First, the CFTC-as-shield strategy is now politically radioactive. Schiff explicitly called the federal registration "this backdoor." Any product team planning to wrap a regulated activity in a derivatives clearing structure should assume Congress now sees the pattern. The uncomfortable read: the same logic could be turned on election contracts next, given the Arizona case alleges Kalshi was taking bets on state elections.

Second, the MLB partnership announced Thursday with Polymarket and the CFTC, framed around "clear boundaries" and "fan engagement," looks like a hedge against exactly this kind of legislation. League partnerships are how regulated sportsbooks bought legitimacy after PASPA fell. Polymarket is running the same playbook six years late.

Third, insider-risk surveillance is now a baseline product requirement, not an enterprise add-on. The OpenAI employee who was fired over alleged Polymarket trades tied to advance knowledge of product announcements, and the bets placed on the death of Ayatollah Ali Khamenei, are the kind of headlines that make regulators move. Any operator running any kind of event contract needs pre-trade blocking, role-based access controls, and entity-resolution tooling that catches related accounts. The Malta Gaming Authority framework treats this as table stakes.

Fourth, the $22 billion valuation assumes a TAM that includes US sports. Strip sports out via federal preemption and that multiple compresses fast. Late-stage investors who came in at the top should be running scenario models this week, not next quarter.

What to Watch

Bipartisan introduction is not passage, and the Senate calendar is what it is. But the signals to track are concrete.

Watch whether the bill picks up co-sponsors from states with strong tribal gaming compacts. Schiff explicitly invoked tribal sovereignty, and tribal coalitions are among the most effective gambling-policy lobbies in Washington. If three or four more senators from gaming states sign on within 60 days, this moves from message bill to real legislation.

Watch the CFTC's posture. Kalshi cited "recent CFTC guidance" in its surveillance update. If the commission distances itself from sports contracts via no-action letters or rulemaking, the bill becomes redundant and may not need a vote at all. That is arguably the worse outcome for Kalshi, because it cuts off the product line without giving the company a legislative fight to rally investors around.

Watch state attorneys general. Arizona moved first. If Texas, Florida, or New York files similar charges, the venue risk alone could force Kalshi and Polymarket to geofence sports markets state-by-state, which is exactly the cost structure they registered with the CFTC to avoid.

Watch Polymarket's valuation round. If it closes near Kalshi's $22 billion despite this bill, the market is pricing in a defeat. If it gets cut or delayed, the smart money already moved.

Key Takeaways

• The Prediction Markets Are Gambling Act would prohibit any CFTC-registered entity from listing sports or casino-style contracts, directly targeting Kalshi and Polymarket's core sports volume.
• Kalshi's same-day rollout of pre-trade blocking for athletes, referees, and personnel is a surveillance capability state-licensed sportsbooks have run for years. Lean integrity stacks are no longer survivable.
• The $4.5 billion Super Bowl-week trading figure is the political pressure point. That scale of unlicensed sports handle was always going to attract bipartisan attention.
• The MLB partnership with Polymarket and the CFTC is a defensive league-legitimacy play, mirroring how regulated sportsbooks bought credibility post-PASPA.
• Engineering teams in iGaming should assume CFTC-registration arbitrage is closing as a strategy, and that pre-trade insider-risk controls are now a baseline regulatory expectation, not a roadmap item.