Are US Prediction Markets Legal? Kalshi vs the CFTC

The legal status of prediction markets in the US comes down to one agency, one law, and a fight over whether an election is a commodity.

Published 2026-08-14 · Data as of 2026-08-14 · Market & data intelligence · Educational, not advice.

People ask whether prediction markets are legal in the United States as if the answer is yes or no. It is neither. The honest answer is that it depends on who runs the market, what the contract is written on, and which regulator has claimed jurisdiction over it. Once you understand those three levers, the whole landscape stops looking like a legal gray zone and starts looking like what it is: derivatives regulation applied to unusual underlyings.

The CFTC is the referee

The Commodity Futures Trading Commission regulates futures, options, and swaps in the US. Under the Commodity Exchange Act, an event contract that pays out based on a future occurrence is treated as a type of derivative, which puts it squarely in the CFTC's lane rather than the SEC's. That is the single most important fact about this space. A prediction market is not gambling in the regulatory sense and it is not a stock. It is a commodity derivative traded on an exchange the CFTC oversees.

To operate legally as a domestic venue, a platform generally registers as a Designated Contract Market, the same category a futures exchange sits in. Registration brings real obligations: capital requirements, market surveillance, reporting, and rules against manipulation. It also brings a protection most people overlook. On a registered exchange, customer funds and market conduct fall under a federal supervisor, which is a different world from an offshore site with no accountable regulator.

The friction point has always been which events an exchange may list. The CFTC can review contracts and, historically, has objected to markets it considered contrary to the public interest or tied to activity like gaming or unlawful conduct. That review power is where the real fights happen.

Why Kalshi went to court

Kalshi is a CFTC-registered exchange built specifically for event contracts. For years the open question was whether it could offer markets on US elections. The CFTC moved to block election contracts, arguing they fell within its authority to prohibit certain event markets. Kalshi challenged that in federal court, and in 2024 a court ruled in Kalshi's favor, allowing election contracts to trade while the matter proceeded. The practical result was that regulated, domestic election markets became available to US users in a way they had not been before.

The significance is less about elections specifically and more about the boundary. The dispute tested how far the CFTC's power to bar contracts actually reaches, and the outcome pushed that boundary toward allowing more event types, not fewer. That is why the case matters even to someone who never trades a political contract. It reshaped what a registered exchange in the US can plausibly list.

Where Polymarket fits

Polymarket is the other name everyone knows, and it operates on a different footing. It runs on crypto rails, with contracts settled in stablecoins on a blockchain rather than through a US-registered clearing structure. In 2022 it settled with the CFTC over offering unregistered event-based binary options and agreed to restrict access for US persons. So while Polymarket is widely used globally and often carries deep liquidity on major questions, it has not been operating as a CFTC-registered venue open to American traders.

That distinction is the whole point of this article. Two platforms can quote a market on the same event, yet one sits inside the federal derivatives framework and one sits outside it. The prices may look comparable. The legal protections, the recourse if something goes wrong, and the eligibility rules do not.

What this means for a reader, not a lawyer

You do not need to memorize statutes. You need to ask three questions of any venue. Who regulates it, if anyone. Is it registered with the CFTC as an exchange, or is it offshore and simply reachable. And what is the contract actually written on, because that determines whether a regulator would even permit it. Those questions separate a supervised market from an unsupervised one faster than any marketing page will.

This is also where seeing the full board helps. Delta Arc's Prediction Markets product shows the picture across Kalshi and Polymarket in one place, which makes the structural differences legible at a glance rather than something you reconstruct venue by venue.

The direction of travel

Regulation here is still being written, and it is being written partly in courtrooms. The Kalshi rulings expanded what registered exchanges can offer, and every new contract type invites a fresh question about where the CFTC's line sits. Expect more litigation over specific event categories, more scrutiny of how offshore liquidity reaches US users, and continued pressure to define event contracts clearly rather than case by case.

The useful habit is to stop asking whether prediction markets are legal and start asking whether a given market is regulated. That question you can actually answer, and the next round of rulings will keep changing the answer for anyone paying attention.