Type "binary options" into a US search bar and the first result is usually a fraud warning from the SEC or the FBI. Type "event contracts" and the first result is Kalshi, a federally regulated exchange where you can buy a contract on whether the Fed cuts rates at its next meeting. Same basic structure, same yes-or-no payout, two completely different relationships with the law.
That gap is not an accident of branding. It is the product of two decades of enforcement actions, one specific CFTC designation, and a working definition of what counts as a legitimate derivatives exchange in the United States. If you are trying to figure out why Kalshi can advertise on cable news while "binary options brokers" get their domains seized, the answer is in the regulatory plumbing.
The structure is almost identical, which is the confusing part
Both instruments do the same thing on paper. You pay somewhere between zero and a dollar for a contract that settles at either one dollar or zero, depending on whether some defined event happens by a defined deadline. Will the S&P close above 5,800 today? Will the next jobs report come in above 200,000? Will a named candidate win an election? Pick a side, pay the price, wait for resolution.
The payout profile is the same fixed-odds binary structure used by sportsbooks and casinos for a century. That is exactly the problem the regulators have spent twenty years trying to solve. If the economic shape of two products is identical, the legal treatment has to be earned through something other than the shape itself. It is earned through where the contract trades, who clears it, and who is allowed to see the order book.
Binary options got their reputation honestly
In the early 2010s, offshore binary options platforms became one of the most prolific consumer-fraud operations on the internet. Operators based in Israel, Cyprus, and elsewhere ran call centres targeting US retail traders, ran trading platforms with manipulated price feeds, and routinely refused to process withdrawals. The FBI eventually estimated industry losses in the billions. Israel banned the entire domestic binary options industry in 2017 after a Times of Israel investigation series documented the scale.
The CFTC's response was direct. Any binary option offered to a US person had to trade on a designated contract market, a registered exchange under CFTC oversight, with a registered futures commission merchant handling the customer account. Off-exchange binary options offered to US residents were illegal. The agency maintains a public list, the RED List, of unregistered foreign entities soliciting US customers, and most of the binary options brokers that flooded search results a decade ago ended up on it.
So the structure was never the issue. The issue was that the operators were unregulated, the venues were opaque, and the customer had no enforceable recourse when things went wrong.
Event contracts are the same shape, run through the regulated pipe
When Kalshi received its designated contract market designation in November 2020, it became the first CFTC-regulated exchange built specifically for yes-or-no contracts on real-world events. Same binary payout structure. Same fixed downside. Different legal universe.
The difference sits in the institutional architecture. Kalshi operates under the same Commodity Exchange Act framework as CME or ICE. Trades clear through a registered derivatives clearing organisation. Customer funds sit in segregated accounts. The order book is visible. Settlement rules are published in advance. If a contract resolves wrong, there is a formal dispute process and a regulator to complain to. None of these things existed in the offshore binary options world, and the absence is most of why that world existed at all. Our deeper guide to Kalshi event contracts walks through the venue mechanics in more detail.
What "event contract" actually means in the statute
There is a specific reason the regulated product got a different name. The Commodity Exchange Act gives the CFTC authority over swaps and futures, and event contracts were classified as a type of swap, specifically a binary option on a non-financial event. The agency then carved out a process by which a designated contract market could self-certify these contracts for listing, subject to a public-interest review for certain categories like elections, gaming, and terrorism.
That self-certification process is what makes the modern event contract market possible. It is also what triggered the long-running fight between Kalshi and the CFTC over political event contracts, which the exchange eventually won in federal court in 2024. The takeaway for a retail user is that the term "event contract" carries legal weight that "binary option" does not. One describes a CFTC-regulated swap traded on a registered exchange. The other, in the US context, describes a product that is illegal to offer off-exchange. Our explainer on the regulated US term for prediction-market positions digs into the statutory mechanics.
The practical difference if you are a US trader
If an offshore website is offering you binary options on stocks, FX, or crypto, and the site is not Kalshi, the North American Derivatives Exchange (Nadex), or another CFTC-designated contract market, you are dealing with an illegal venue. That is true regardless of how slick the interface looks, how legitimate the licensing claims sound, or whether the operator references a real regulator in another jurisdiction. The CFTC's position is blunt: a foreign licence does not authorise a firm to solicit US customers for binary options.
On the regulated side, the user experience looks more like a brokerage account than a casino. You verify your identity, fund the account through a US bank, and trade on a visible order book against other market participants rather than against the house. Fees are published, settlement is rule-based, and the platform has a regulatory motivation to resolve disputes correctly. The upside is bounded, the downside is bounded, and the contract is enforceable. The legal status of prediction markets in the US is more nuanced at the state level, but the federal framework is clear.
Why this matters beyond the legal label
The regulatory difference is not just a paperwork distinction. It produces structurally different markets. A regulated event-contract venue has every incentive to keep its order book honest because its DCM designation depends on it. An offshore binary options operator has every incentive to skim the price feed because there is no one to stop them.
That shows up in price discovery. Event contracts on Kalshi or Polymarket aggregate the views of thousands of participants into a probability you can actually use, which is why financial news desks now quote them. Binary options prices on a closed offshore platform aggregate nothing, because the counterparty is the platform itself and the price is whatever the operator says it is. The economic information content is wildly different despite the identical payout structure.
iPredicta tracks regulated event-contract markets across Kalshi, Polymarket, and the major UK exchanges, with an editorial layer that explains why a given probability moved and what it might be missing. The platform exists for readers who want to understand event markets as a serious tool for thinking about the future, not as a wrapper for the kind of product the CFTC has been trying to shut down for fifteen years.
Frequently asked questions
Are binary options legal in the United States?
Binary options are legal in the US only when traded on a CFTC-designated contract market. Off-exchange binary options offered to US residents, including by foreign brokers, are illegal under the Commodity Exchange Act. The CFTC and SEC have both issued repeated investor alerts warning that the vast majority of online binary options platforms soliciting US customers operate outside the law. The agency maintains a Registration Deficient list of unregistered foreign entities for exactly this reason. The handful of legitimate venues, including Nadex and Kalshi, are registered exchanges with published rulebooks, segregated customer funds, and CFTC oversight. If a platform cannot tell you which DCM it operates under, it is not legal.
What is the actual difference between an event contract and a binary option?
Economically, almost nothing. Both are yes-or-no contracts on a defined event with a fixed payout, usually one dollar for the winning side and zero for the losing side. The difference is legal and structural. An event contract on Kalshi is a CFTC-regulated swap traded on a designated contract market, cleared through a registered clearinghouse, with customer funds held in segregated accounts. A binary option, in the way the term is used in US enforcement contexts, usually refers to the same product offered off-exchange by an unregistered operator, where the counterparty is the platform itself and there is no regulator to appeal to.
Why did the CFTC crack down on binary options brokers?
The crackdown was a response to systemic consumer fraud. Through the 2010s, offshore binary options platforms ran high-pressure sales operations targeting US retail traders, used manipulated price feeds, and routinely refused withdrawals. The FBI estimated industry-wide losses in the billions, and Israel banned its domestic binary options industry outright in 2017 after a Times of Israel investigation. The CFTC's position was that any binary option offered to a US person had to trade on a registered exchange with a registered broker handling the account. That ruled out essentially the entire offshore industry and pushed legitimate activity onto venues like Nadex and, later, Kalshi.
Can Kalshi offer event contracts because they avoid being called binary options?
No, the name is a marker, not a loophole. Kalshi can offer event contracts because it is a designated contract market under the Commodity Exchange Act, with the regulatory plumbing the CFTC requires. The exchange clears through a registered derivatives clearing organisation, publishes its rulebook, segregates customer funds, and submits its contracts to the agency for review or self-certification. That is the substantive difference. The term "event contract" is used in the statute and in CFTC regulations to refer to this category of swap on a non-financial event, but using the term without the underlying registration would not make a product legal.
Is the risk profile of an event contract really different from a binary option?
The payout shape is identical, but the operational risk is not. On a regulated event-contract venue, the worst case for the trader is that the position resolves against them and they lose what they paid for the contract. On an unregulated binary options platform, the worst case is that the operator manipulates the price, refuses withdrawals, or simply disappears with the customer funds, and there is no regulator to make whole. That distinction is most of why the legal framework cares about the venue, not the instrument. Our guide on how prediction market odds work covers the price-discovery side of the same point.