WOYALE.
A prediction market is not a sportsbook in the legal sense, but it can feel like one. You can buy a contract that pays if a team wins. The company running it says it operates under federal commodities law, not state gambling law. Many states say it is sports betting and needs a state license. The courts have not given one answer, and as of October 22, 2026 the question is open.
This page is general information, not legal advice. It describes the category and does not recommend any platform.
What an event contract is
An event contract is a yes/no contract on a future event. A “Yes” share costs between $0.01 and $0.99 and pays $1.00 if the event happens, or nothing if it does not. A price of $0.62 means the market puts the chance at about 62%. You are trading with other users on an exchange rather than betting against a house.
The category includes exchanges registered with the Commodity Futures Trading Commission (CFTC) as designated contract markets. Kalshi is one example. Polymarket’s US exchange is another. Some brokerage apps, such as Robinhood, let customers trade event contracts routed through such exchanges. Naming them here describes the category, not an endorsement.
Contracts cover politics, weather, economic data and sports outcomes. The sports contracts are where the legal fight is.
How they differ from a sportsbook
| State-licensed sportsbook | Event-contract exchange | |
|---|---|---|
| Who regulates it | A state board or commission | The CFTC, a federal agency |
| What you buy | A bet at posted odds | A contract priced $0.01-$0.99 |
| Your counterparty | The sportsbook (the house) | Another trader, via the exchange |
| Where the company’s margin comes from | Built into the odds | Mostly trading fees and the bid-ask gap |
| State license needed | Yes | The exchanges say no; many states say yes |
| How winnings are taxed | Gambling income | A question for a tax professional |
Two rows deserve extra care.
Taxes. Whether gains on a sports event contract count as gambling winnings or as capital gains changes your loss deduction; see Deducting gambling losses. Ask a CPA how your gains are classified, and keep records.
Consumer protection. CFTC-registered exchanges have federal rules about customer funds, surveillance and trading misconduct, so the protection picture differs from an offshore site. See Are offshore sportsbooks legal?. The protection is different from state sportsbook rules, not necessarily weaker or stronger. It depends on which rules end up applying.
The legal question
The Commodity Exchange Act gives the CFTC exclusive jurisdiction over swaps traded on its registered exchanges. The platforms argue that sports event contracts are swaps, so federal law overrides state gambling statutes (called preemption). States answer that a contract paying out on a game is a wager, which they license, and that the federal law doesn’t take that power away.
What courts have done
These are mostly preliminary-injunction rulings, which are early assessments, not final judgments.
- Third Circuit, April 6, 2026. In a case from New Jersey (KalshiEX v. Flaherty), the court ruled 2-1 for the exchange. It affirmed an order that stopped New Jersey from enforcing its gambling laws against Kalshi’s sports contracts, because Kalshi showed a reasonable chance of proving that the Commodity Exchange Act preempts the state law. One judge dissented.
- Ninth Circuit, August 28, 2026. In KalshiEX v. Assad (Nevada), the court held that Kalshi was unlikely to show federal law preempts Nevada’s gaming rules for sports contracts, reasoning that sports event contracts are bets rather than “swaps”. It upheld the lower court’s decision to dissolve the injunction and sent a separate issue about election contracts back to the trial court.
- Sixth Circuit, September 25, 2026. In cases from Ohio and Tennessee (KalshiEX v. Schuler and KalshiEX v. Orgel), the court held that the federal law neither expressly nor impliedly preempts those states’ gambling laws. It affirmed the denial of Kalshi’s injunction in Ohio, vacated the injunction that had blocked Tennessee, and sent that case back.
- Fourth Circuit. The Maryland appeal (No. 25-1892) was still pending when the Sixth Circuit ruled on September 25, 2026.
- State courts. On January 20, 2026, the Massachusetts attorney general announced a state-court preliminary injunction that stops Kalshi taking sports event contracts from people in Massachusetts until it follows the state’s sports gaming laws, including licensure.
So the same kind of contract can have a federal court backing the platform in one part of the country and a federal court backing the state in another.
Supreme Court
New Jersey filed a petition for review on September 2, 2026 (Flaherty v. KalshiEX, No. 26-299). The response was due October 8; the Court extended it to November 9, 2026. The Court has not agreed to hear the case, and if it does take the case, briefing and argument would follow before any ruling.
The federal agency
The CFTC has also taken part. On April 2, 2026 it sued Arizona, Connecticut and Illinois, saying its jurisdiction over event contracts is exclusive, and it later sued other states, including New York, New Mexico and Kentucky.
On October 9, 2026 the CFTC also published a proposed rule that would expressly define event contracts, including sports ones, as swaps. Comments are due within 30 days of its Federal Register publication. A final rule would strengthen the agency’s argument but would not by itself end the court fights.
The states
State action has taken the form of cease-and-desist letters and lawsuits. Connecticut’s Department of Consumer Protection sent cease-and-desist letters on December 3, 2025 to KalshiEX, Robinhood Derivatives and Crypto.com. Tennessee’s Sports Wagering Council sent Kalshi a cease-and-desist letter in early 2026, and Kalshi then sued in federal court. The companies dispute that the states have authority.
What it means for you
- Availability can differ by state and can change quickly.
- A contract that was available last month may be blocked in your state next month.
- Ask any platform what happens to open positions and balances if a state order forces it to stop. Terms differ.
- This is not the same as an offshore site. A CFTC-registered exchange is a US-regulated business. Whether it is also subject to your state’s gambling law is the open question.
- Check your state’s page, such as Nevada or New Jersey, for what the state regulator says.
For the federal laws behind the sportsbook side, see Federal law on online sports betting.
Common questions
Is a prediction market the same as sports betting?
Economically it looks similar: you risk money on a game result. Legally it is the center of the dispute. The platforms say it is a federally regulated swap, and states say it is a wager.
Is it legal where I live?
It depends on where you live, and the answer is changing. Federal courts disagree, and states have sent orders to platforms. Check your state’s regulator and the platform’s current notices.
Will the Supreme Court settle it?
Maybe. It has been asked to, but has not agreed. Even if it takes the case, a ruling would be months away.