Are Prediction Markets Legal? It Depends Where You Are
Prediction markets let people bet on real-world outcomes, from elections to interest rates. Their legal status is shifting fast, and the answer depends heavily on where you are and what you are trading.
Prediction markets are exchanges where people buy and sell contracts tied to the outcome of a real-world event, such as an election, an interest rate decision, or a sports result. In the United States their legality depends on how the contract is classified and who runs the venue: some platforms operate as federally regulated exchanges, while others operate offshore and restrict or exclude US users. There is no single yes or no answer, and the rules are being actively contested in court and by regulators.
Key takeaways
- In the US, prediction markets can be legal when the contracts are treated as event derivatives and traded on a venue registered with the Commodity Futures Trading Commission (CFTC). Kalshi operates on this basis.
- Offshore, unregistered platforms such as Polymarket have historically blocked US users under a settlement with the CFTC, though usage patterns and enforcement remain contested.
- The central legal fight is whether event contracts, especially on elections, are permitted derivatives or prohibited gaming. Courts and regulators have not fully settled this.
- Legality varies sharply by country. What is allowed in the US may be banned or unregulated elsewhere, and vice versa.
- Being a licensed exchange does not make every contract legal. The instrument, the venue, and the jurisdiction all matter independently.
Why prediction markets exist at all
Before formal prediction markets, people who wanted to bet on an outcome had two options: a private wager with a friend, or a bookmaker taking bets on sports and politics. Neither produced a reliable public signal about what a crowd actually believed would happen.
Prediction markets solve a different problem. When many people stake real money on whether an event will occur, the price of the contract behaves like a probability. If a contract that pays $1 if a candidate wins is trading at 60 cents, the market is implying roughly a 60 percent chance. Economists have long argued that these prices can aggregate dispersed information better than a single poll or pundit, because participants are financially punished for being wrong.
That is the appeal. It is also the source of the legal problem. A market that pays out based on whether an event happens looks, to some regulators, like a legitimate hedging and forecasting tool. To others, it looks like gambling with extra steps. Much of the law here is a fight over which of those descriptions applies.
Why this matters now
Prediction markets moved from academic curiosity to mainstream attention during recent US election cycles, when platforms drew heavy trading volume on political outcomes and their prices were quoted alongside traditional polling in news coverage.
Two names dominate the conversation. Kalshi is a US-based exchange regulated by the CFTC, which lets it offer event contracts to US residents under federal oversight. Polymarket is a larger, offshore platform built on public blockchains, meaning its trades settle on a shared, publicly viewable ledger rather than through a private company database. Polymarket agreed to block US users following a 2022 CFTC settlement.
The stakes are concrete. If regulated event contracts are here to stay, banks, hedge funds, and corporations gain a new tool to hedge risks that no traditional instrument covers cleanly, such as the outcome of a regulatory decision. If courts decide these are unlawful gaming products, an entire emerging market could be forced offshore or shut down. Journalists and regulators also increasingly rely on the underlying trade data to understand who is actually participating. Allium provides normalized, labeled onchain data that institutions, researchers, and newsrooms use to read these markets, and has published research on US participation in Polymarket political betting despite the ban, a finding that speaks directly to how well the offshore restriction holds in practice.
How the legal analysis works, step by step
To judge whether a given prediction market is legal, regulators and lawyers generally work through the same sequence.
- Classify the contract. Is it a swap or futures contract on an event, which falls under the CFTC? Is it a security, which falls under the Securities and Exchange Commission? Or is it a bet, which falls under state gaming law? The classification drives everything.
- Identify the venue. A contract that would be legal on a registered exchange (a Designated Contract Market in CFTC terms) may be illegal on an unlicensed platform offering the same thing.
- Check the jurisdiction. US federal rules, individual state gambling laws, and foreign regulators can all apply at once. A platform legal at the federal level may still conflict with a state ban.
- Test the specific market. Regulators can approve a platform generally but object to particular contracts. Election contracts have drawn the most scrutiny because federal rules bar event contracts that involve gaming or activity that is against the public interest.
The reason this matters: a headline saying a platform is legal or illegal is almost always incomplete. Legality attaches to the combination of instrument, venue, and place, not to the brand.
The election-contract fight
The sharpest US dispute has been over letting people trade contracts on election outcomes. The CFTC moved to block Kalshi from listing certain congressional-control contracts, arguing they amounted to gaming and touched the public interest. Kalshi challenged that in court and won a significant ruling allowing the contracts to proceed while litigation continued.
Why care if you never plan to trade an election contract? Because the outcome defines the boundary of the entire market. If courts read the CFTC's authority narrowly, regulated exchanges gain room to list a much wider range of event contracts. If the agency's interpretation prevails, whole categories of markets stay off-limits domestically and migrate to offshore or crypto-native venues that US users are not supposed to access.
Regulated versus offshore: a concrete comparison
| Dimension | CFTC-regulated exchange (e.g. Kalshi) | Offshore onchain platform (e.g. Polymarket) |
|---|---|---|
| US user access | Permitted, subject to platform rules | Blocked under CFTC settlement |
| Oversight | Federal registration, reporting, and compliance obligations | No US registration; operates outside CFTC authority |
| Settlement and records | Private exchange systems under regulatory audit | Public blockchain, visible to anyone who can read the ledger |
| Contract approval | Contracts subject to CFTC review and possible objection | Contracts listed by the platform without US approval |
| Consumer protections | Applicable US derivatives protections | Limited; depends on offshore jurisdiction |
What changes when you move from betting to a regulated market
The practical differences are real, not cosmetic.
- Enforceable payout: On a registered exchange, a winning position is backed by a regulated clearing process, so you are not relying on a counterparty's goodwill the way you would with a private wager.
- Auditable pricing: Regulated venues must keep records regulators can inspect, so a disputed settlement has a formal channel for review rather than an argument between two people.
- Public data on onchain venues: Because platforms like Polymarket settle on a public ledger, anyone can independently reconstruct volume and positions. That transparency is why newsrooms scrutinize them. Bloomberg cited Allium data on possible Polymarket settlement manipulation, a form of oversight that is far harder with a closed private book.
How the law differs around the world
Legality is not just a US question. Some countries treat prediction markets as regulated financial products, some fold them into existing gambling licensing regimes, and many have no specific framework at all, leaving platforms in a gray zone. A market that welcomes users in one country may geoblock users in another to avoid enforcement. For anyone assessing these markets, the location of the user and the location of the venue can both trigger different rules, and the two do not have to agree.
Risks and open questions
The legal picture is genuinely unsettled, and honesty about that matters more than a false clean answer.
- Classification is still contested. Whether election and other event contracts are permitted derivatives or prohibited gaming has not been resolved with finality. Court rulings can shift the line.
- Enforcement gaps are real. Offshore platforms restrict US access, but research suggests US participation persists despite the ban, raising open questions about how enforceable geoblocking really is.
- State and federal law can collide. A platform cleared at the federal level may still face state gambling statutes, and that friction is not fully worked out.
- Settlement integrity. Because payouts hinge on how an event is resolved, disputes over who decides the outcome, and whether that resolution can be manipulated, are a live concern.
- Rules can change quickly. Agency leadership, litigation, and legislation are all moving. Today's status is a snapshot, not a settled precedent.
None of this is legal advice. It is a description of the current state of play, and anyone acting on it should consult counsel and check the rules in their own jurisdiction.
Frequently asked questions
Are prediction markets legal in the United States?
Some are. Platforms that register with the Commodity Futures Trading Commission and offer event contracts under that oversight, such as Kalshi, can legally serve US residents. Unregistered offshore platforms such as Polymarket block US users under a CFTC settlement. Legality depends on the specific contract, the venue, and the jurisdiction.
Why are prediction markets controversial with regulators?
Because it is unclear whether event contracts are legitimate financial derivatives, which the CFTC oversees, or a form of gambling, which state gaming laws govern. Election contracts have drawn the most scrutiny, since federal rules bar event contracts involving gaming or activity deemed against the public interest.
Is Polymarket legal for US users?
Polymarket agreed to block US users following a 2022 CFTC settlement, so it is not authorized to serve them. Because it settles trades on a public blockchain, researchers have been able to observe that US participation appears to persist despite the ban, which is part of why enforcement remains contested.
How is Kalshi allowed to operate when others cannot?
Kalshi registered as a CFTC-regulated exchange, which allows it to offer event contracts to US residents under federal oversight, reporting, and compliance obligations. That registration is what separates it from unlicensed venues, though specific contracts it lists can still face regulatory objection.
Are prediction markets legal outside the US?
It varies widely. Some countries regulate them as financial products, some treat them under gambling licensing, and many have no specific framework, leaving them in a gray zone. Platforms often geoblock users in jurisdictions where their legal status is unclear or prohibited.
Does trading on a licensed prediction market guarantee the contract is legal?
No. A platform can be a registered exchange while a particular contract it wants to list is still challenged or rejected. Legality attaches to the combination of the instrument, the venue, and the jurisdiction, not to the platform's brand alone.
