Is Kalshi legal in the US?

Kalshi operates as a designated contract market — a CFTC-regulated exchange, the same category of registration that covers futures exchanges. That is a federal authorisation to list and match event contracts, granted by a named regulator whose registry you can look up yourself. How that footing compares with Polymarket's is covered in Polymarket vs Kalshi.

This is a genuinely different footing from an offshore venue, and it is the reason Kalshi settles in dollars through the ordinary banking system rather than in crypto. The registry link is in the sources below; reading it directly is more reliable than reading anyone's summary of it, including this one.

The designation covers the exchange. It does not automatically settle every question about every contract in every state, and it has not stopped states from taking their own position — several have argued that particular contract types fall under state gambling law regardless of the federal registration.

That tension is live and it is being worked out in courts and regulators' offices rather than being settled. The honest summary is that the federal position is clear, the state-by-state position is not uniformly so, and anyone telling you otherwise is compressing an unresolved dispute into a sentence.

The disputes cluster around sports. Event contracts on elections, economic data and weather have a long history of being argued as hedging or price-discovery instruments; contracts on the outcome of a game look, to a state gaming regulator, a great deal like the thing that state licenses and taxes.

That is the fault line to watch, and it is why the answer to "is this legal where I am" can differ between two contracts on the same exchange on the same day.

We match Polymarket markets to their Kalshi counterparts by title, requiring a word-overlap score above 0.6 before we call it a match. Running that across our cache — 43,914 markets tracked as of 1 September 2026 — produces a finding relevant to anyone reading about legality: the venues frequently list what looks like the same question with materially different resolution wording.

That matters legally as well as financially. A contract's regulatory treatment follows what it actually settles on, not the headline. Two markets with the same title can be a data contract on one venue and something closer to a wager on the other — and that difference is precisely what the state-level arguments turn on.

The practical habit: read the resolution rules before assuming two venues are offering you the same instrument. We built the matching to surface exactly this, and near-misses are more common than clean matches.

Check the CFTC registry for the exchange's current status. Read the contract's own rules, not its title. Then check your state — that is the part no national guide can do for you, and the part that changes most often.

If real money and a real legal question are involved, a qualified attorney in your state is worth more than any article, this one included.