What prediction markets are legal in the US?

Not measured — no engine answer has been captured on this question yet. That is different from the engines answering and naming nobody.

10 of 23 names confirmed · named in 2 or more of 14 answers · 0 engines

In the U.S., federally regulated prediction markets are legal nationwide when operated by a Commodity Futures Trading Commission (CFTC)-registered exchange like Kalshi. However, some states are challenging or restricting them, so availability can vary depending on local laws. The primary legal prediction markets operating in the U.S. include Kalshi, ForecastEx, Polymarket US, and Aristotle Exchange DCM.

1Kalshinamed in 14 of 14 answers
2Polymarketnamed in 12 of 14 answers
3Robinhoodnamed in 6 of 14 answers
4ForecastExnamed in 5 of 14 answers
5PredictItnamed in 5 of 14 answers
6Crypto.comnamed in 4 of 14 answers
7Robinhood Predictnamed in 3 of 14 answers
8DraftKings Predictionsnamed in 3 of 14 answers
9FanDuel Predictsnamed in 3 of 14 answers
10Iowa Electronic Marketnamed in 2 of 14 answers
11Polymarket USnamed in 1 of 14 answersone answer
12Aristotle Exchange DCMnamed in 1 of 14 answersone answer
13CME Groupnamed in 1 of 14 answersone answer
14Electron Exchangenamed in 1 of 14 answersone answer
15Railbird Exchangenamed in 1 of 14 answersone answer
16Xchange Alphanamed in 1 of 14 answersone answer
17Novignamed in 1 of 14 answersone answer
18ProphetXnamed in 1 of 14 answersone answer
19Ludlow Exchangenamed in 1 of 14 answersone answer
20Optex Marketsnamed in 1 of 14 answersone answer
21Water Street Labsnamed in 1 of 14 answersone answer
22Juice Exchangenamed in 1 of 14 answersone answer
23Interactive Brokersnamed in 1 of 14 answersone answer

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The full measurement

The position each of the 14 engines gave all 23 names.
How many of the 14 answers named each of them.
Where the engines disagree, and by how much.
Fan-out — the query each engine actually searched.
Every citation, and the sources nobody cited.

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