A retail trader in Florida in 2015 could log on to a slick-looking platform, click a button labelled "call" or "put", stake fifty dollars on whether the euro would be above 1.10 in the next sixty seconds, and either double the money or lose it all when the clock hit zero. To the trader it felt like a market. To the Commodity Futures Trading Commission it looked like something closer to a rigged casino run out of an offshore jurisdiction, and by 2017 the agency had brought enough enforcement actions to effectively drive the retail binary options industry out of the United States.
The wreckage is why the question matters. Binary options and prediction markets can look almost identical on the screen, both pay a fixed amount when a yes/no condition resolves, both quote prices between zero and one, and both are pitched as ways to have a view on a future event. The differences underneath are large, and getting them wrong is the sort of mistake that ends with a locked account and no way to withdraw funds.
The shape of a binary option
Picture the trade at its cleanest. A binary option is a contract that pays a fixed sum if a specified condition is true at a specified moment, and nothing if it is not. The underlying is usually a financial instrument: a currency pair, a stock index, a commodity price, sometimes a single equity. The condition is almost always a price threshold. Will EUR/USD be above 1.0850 at 3pm? Will gold close above $2,000 today? Will the S&P print above yesterday's high in the next five minutes?
The payoff is fixed at the moment of the trade. Stake $100, win $180 if you are right, lose the $100 if you are wrong. That is the classical form.
Crucially, the seller of the option is almost always the platform itself. There is no order book matching your yes against another user's no. The house prices both sides, the house takes the other side of your bet, and the house profits when the average customer loses. Which, given the design, is what happens.
Why the CFTC shut it down
The US binary options crackdown was not really about the product. It was about how the product was sold. Offshore platforms marketed aggressively to retail traders through YouTube gurus and Facebook ads, promising algorithmic wealth from sixty-second trades. Deposits flowed in. Withdrawals, according to hundreds of complaints filed with the Federal Bureau of Investigation and the CFTC, mysteriously did not flow back out.
In 2013 the CFTC and the Securities and Exchange Commission issued a joint investor alert flagging binary options fraud, and the FBI went on to warn publicly that the schemes were a growing source of consumer losses. Platforms with names like Banc de Binary and SpotOption were sued, fined, and in some cases shuttered. By the end of the decade, offering binary options to US retail customers off-exchange was, in practice, illegal.
The technical position is more precise than that. Binary options are not banned in the United States outright. They can be offered legally, but only on a CFTC-designated contract market, with the exchange as intermediary, transparent pricing, and regulatory oversight. That is a narrow door. Almost nothing that called itself a binary options platform in the retail-marketing era went through it.
Where prediction markets diverge
Now put a prediction market next to it. On Kalshi or Polymarket, a contract on the same nominal shape (yes or no, one dollar payoff, priced between zero and one) is structured entirely differently. There is an order book. Your yes at 62 cents is matched against someone else's no at 38 cents, and the exchange takes a small fee for making the match happen. The platform is not your counterparty. It is the venue.
That single structural difference cascades into most of the others. Because the platform does not take the other side, it does not need the average customer to lose. Prices reflect the aggregate view of participants, not a house-set spread engineered for margin. Withdrawal risk, the practical hazard that killed retail binary options, drops sharply on a properly capitalised exchange. And on the regulated side, Kalshi's event contracts sit under CFTC oversight as designated market contracts, precisely the door that offshore binary options refused to walk through.
The range of questions is also different. Binary options ask, almost exclusively, will this price be above or below this level at this time. Prediction markets ask who will win the election, will the ceasefire hold, will the Fed cut, will Argentina reach the semi-final. The underlying is a real-world event, not a financial tick.
The vocabulary trap
It gets worse. Under US commodities law, a yes/no event contract of the kind Kalshi lists sits within the same broad statutory family as a binary option, since both pay a fixed amount on a binary outcome. In that legal sense "binary option" is a wide category spanning both the shady offshore product and the regulated event contract, distinguished mainly by venue and oversight rather than by the shape of the payoff.
This is why the disambiguation matters. When a US financial journalist writes "binary options are illegal in the US", they almost always mean the offshore retail product. When a CFTC lawyer writes "binary options are permitted on designated contract markets", they mean the same word to include Kalshi. The word does two jobs.
A useful shorthand: if a product calls itself a binary options broker and lets you trade sixty-second EUR/USD contracts from a non-US website, treat it as the offshore retail category and be extremely careful. If a product calls itself a prediction market or event contract exchange, matches user orders on-book, and is either CFTC-regulated (Kalshi) or explicitly not offered to US persons (Polymarket historically), it is a different animal even if the technical legal classification overlaps.
Risk profile, side by side
The payoff maths are similar. Stake something, get something fixed back if right, lose the stake if wrong. But the risk you are actually taking is not the same.
On a binary options platform, your risks stack: the market can move against you, the platform can quote you a spread engineered against you, the platform can refuse withdrawals, the platform can vanish. Regulated prediction markets remove most of the last three. The market can still move against you, and it will, but the venue is not the adversary.
There is also the question of what you are actually forecasting. Sixty-second currency pips are, for retail traders, essentially noise. Winning consistently requires either an edge in market microstructure that retail traders do not have, or luck. Prediction markets on political and macro events reward domain knowledge in a way short-horizon financial binaries do not. The research on why prediction markets tend to be accurate rests partly on that fact, participants who know things can express their view in a way that moves prices.
What UK readers should know
Britain took the harder line. From 2 April 2019, the Financial Conduct Authority made permanent a ban on the sale of binary options to retail consumers, following a temporary European ban imposed by the European Securities and Markets Authority in July 2018. The FCA was blunt about why, describing binary options as "gambling products dressed up as financial instruments," and it estimated the permanent ban could save retail consumers up to £17 million a year. That sat alongside the wider regulatory finding that the large majority of retail customers lost money on these products overall.
Prediction markets sit in a different regulatory bucket in the UK. Exchange-style event trading is generally handled under Gambling Commission licensing rather than FCA authorisation, which is why Betfair Exchange and Smarkets look the way they do. If you are in the UK and reading about American prediction markets, the rules governing which platforms UK users can actually access are worth reading before you sign up for anything.
The practical upshot: binary options to UK retail customers is banned. Regulated prediction market equivalents exist but wear different clothing.
Where the confusion causes real harm
The reason to be pedantic about this is that offshore binary options operators actively exploit the confusion. Post-crackdown, several rebranded as "prediction platforms" or "event trading" services, kept the same house-against-customer structure, and picked up traffic from people googling the legitimate product. Others simply moved to lightly regulated jurisdictions and continued to accept US and UK customers who probably should not be there.
The tells are consistent. A platform that quotes you both sides of a trade itself, without an order book you can inspect, is not a prediction market in any meaningful sense. A platform pushing sixty-second currency binaries is not offering event contracts. A platform whose customer service goes silent the moment you request a withdrawal is the classic offshore binary options tell, regardless of what it calls itself.
iPredicta covers regulated prediction market venues and the event contracts that trade on them, tracking price movements and market context across Polymarket, Kalshi, Betfair Exchange and Smarkets. If a product is not on an exchange with real order books and real regulatory oversight, it is not the thing this site is about, no matter how similar the payoff diagram looks.
Frequently asked questions
Are binary options illegal in the US?
Binary options are legal in the US only when traded on a CFTC-designated contract market. Offering them off-exchange to retail customers is not permitted, which is why almost every offshore binary options broker that marketed to Americans in the 2010s was operating outside the law. The CFTC and SEC issued repeated investor alerts, brought enforcement actions, and forced most of the retail industry offshore or out of business. Regulated exchanges can still list contracts that are legally classified as binary options, which is one reason Kalshi's event contracts technically fall under that broader category. The distinction that matters in practice is venue: on a regulated exchange with an order book, yes; from an offshore website that takes the other side of your bet, no.
How is a prediction market different from a binary option?
The core difference is who takes the other side of your trade. On a prediction market, another user does, matched through an order book, with the platform earning a small fee. On a classic retail binary options platform, the platform itself is your counterparty and profits when you lose. This changes almost everything downstream: pricing reflects participant views rather than a house-set spread, withdrawal risk is lower on regulated venues, and the range of questions extends beyond short-horizon price ticks to political, economic, and sporting outcomes. Confusingly, US commodities law can classify some regulated event contracts as a type of binary option, so the terms overlap in legal writing even when the products behave very differently in practice.
Can UK residents legally trade binary options?
No, the Financial Conduct Authority permanently banned the sale of binary options to UK retail consumers on 2 April 2019. The ban followed a temporary European measure imposed by ESMA in July 2018, and the FCA estimated the permanent prohibition could save retail consumers up to £17 million a year. Any platform offering binary options to UK retail customers is doing so outside FCA rules, which typically means it is either operating illegally or targeting a professional-classified audience. Prediction market equivalents sit under different regulation in the UK, generally Gambling Commission licensing, which is why exchange venues like Betfair and Smarkets can offer event markets without being caught by the FCA ban.
Are Kalshi contracts the same as binary options?
Legally, Kalshi contracts fall within the CFTC's broad definition of binary options, but structurally they behave nothing like the retail product that was driven offshore. Kalshi runs an order book where users trade with each other, publishes transparent pricing, and operates as a designated contract market under CFTC oversight. Retail binary options brokers, by contrast, quote both sides themselves and profit from customer losses. The overlap is a matter of statutory classification rather than product design. In everyday usage most writers reserve "binary options" for the offshore retail category and "event contracts" or "prediction markets" for regulated exchanges, which is a cleaner distinction even if the law does not draw it that neatly.
How can I tell if a platform is a legitimate prediction market or a rebranded binary options broker?
Look for an order book you can actually inspect. Legitimate prediction markets show yes and no orders resting at different prices, with volume and depth visible, because they match users against each other. A rebranded binary options platform will quote you a single price it is prepared to trade with you at, without any user-facing depth, because it is the counterparty. Other tells include very short expiry windows on financial instruments, aggressive bonus offers tied to trading volume, opaque withdrawal terms, and regulatory registration in jurisdictions with weak oversight. If a platform is regulated by the CFTC, the FCA, or the UK Gambling Commission, that information is easy to verify on the regulator's own website.