Kalshi vs Polymarket: what actually differs in 2026

If you are choosing between Kalshi and Polymarket, you are really asking three questions at once: which one is legal where I live, which one has the markets I care about, and which one is worth the money. Those have different answers, and most comparisons blur them together.

Here is the straight version, with the primary documents linked so you can check every claim yourself.

The short answer

Both are real, federally regulated exchanges. Neither is a grey-market offshore site. The difference that matters most in 2026 is not the interface or the market list, it is which one is reachable from your state and which one lists the questions you actually want to trade.

If you want the broadest set of news, politics and economics questions with a long operating history, Kalshi is the more established venue. If you came from crypto and want the deepest liquidity on high-profile global questions, Polymarket is the one you already know. If you do not want to put money in at all, that is a third option, and we will get to it honestly at the end.

What each one actually is

Kalshi runs on KalshiEX LLC. The CFTC issued it an Order of Designation as a designated contract market on November 4, 2020, making it the first US exchange approved specifically to list event contracts.

Polymarket's US-facing business runs through QCX LLC, which now operates under the Polymarket US name. The CFTC designated QCX as a contract market by an order dated July 9, 2025, later amended; the amended Order of Designation is on the CFTC's own site. That designation is what separates Polymarket US from the offshore Polymarket that US residents were previously blocked from.

Both list binary contracts. Polymarket US filed its contract terms with the CFTC, and the rulebook filing states that each contract has a notional size of $1.00, trades between $0.001 and $0.999, and settles at $1.00 if the criterion is met or $0.00 otherwise. The same filing states that persons under 18 years of age are not permitted to create Polymarket US accounts.

Where the law stands right now

This is the part that changes fastest, and the part most comparison pages get wrong because they were written a year ago.

On April 6, 2026 the Third Circuit decided KalshiEX LLC v. Flaherty, No. 25-1922, 2-1. The majority held that the Commodity Exchange Act preempts New Jersey's state gaming statutes as applied to sports-related event contracts listed on a CFTC-licensed exchange. In the court's words, "Because Kalshi's sports-related event contracts are swaps under the Act, the District Court properly defined the scope of field preemption as the regulation of trading on a DCM." You can read the opinion itself.

Two things that ruling does not do. It is a preliminary injunction decision about likelihood of success, not a final judgment on the merits. And it binds the Third Circuit, not the country. The Sixth Circuit went the other way on an injunction request in April 2026, describing the preemption arguments as largely in equipoise, and appeals in other circuits were still pending as of late August 2026, which is why practitioners keep saying this ends up at the Supreme Court. Holland & Knight's survey of the preemption fight lays out the case-by-case posture.

The practical consequence for you: state availability on both platforms can change on a court's timetable, not a product timetable. Check the platform's own current state list before you fund an account, not a blog post.

Side by side

| | Kalshi | Polymarket US | Ravioli | |---|---|---|---| | What it is | CFTC-designated contract market | CFTC-designated contract market | Free-to-play prediction game | | Designation | Order of Designation, Nov 4, 2020 | Order of Designation, Jul 9, 2025 (amended) | Not an exchange, no designation needed | | What you put in | Real money | Real money | Nothing, Sense is free | | Contract structure | Binary event contracts | Binary, $1.00 notional, settles $1.00 or $0.00 | Binary and multi-option markets | | Where the odds come from | Live order book | Live order book | Mostly AI-seeded opening lines, thin trading | | State availability | Subject to ongoing litigation | Subject to ongoing litigation | Not affected, no money changes hands |

On fees, both platforms publish their own current schedules and both have changed them. We are not going to quote a fee number we could not verify from the platform's own documents this morning, because a stale fee figure is worse than no fee figure. Read each platform's fee page before you trade.

Which one should you use

If you want real money on the line, pick on markets and access, in that order. Kalshi has the longer record and a wider spread of economics, weather and policy questions. Polymarket US has the name recognition and the crypto-native audience. Both are legitimate; we said as much when we looked at whether Kalshi is legit.

There are cases where the paid platforms are plainly the better choice, and we would rather say so than pretend otherwise. If you want your forecast to be worth something in dollars, if you want a genuine order book with real counterparties, or if you want prices that reflect crowd money rather than a model's first guess, you want an exchange, not a free game. That is not a close call.

What free-to-play changes

Ravioli is free to play. There are no deposits, no identity verification, no fee schedule and no state-by-state availability question, because there is no money moving. Sense is free and prizes are real.

The honest cost is liquidity. This morning our board carried 749 open markets, and of the 600 I read, only 49 had any trading volume at all. On the rest, the number you see is an AI-seeded opening line, not a crowd view. We label that distinction rather than dressing an opening line up as market consensus, and we publish our misses at the same size as our hits.

So: use Kalshi or Polymarket US if you want money at risk and real price discovery. Use Ravioli if you want to practise calling things, build a public record of your reasoning, and find out whether you are actually any good at this before it costs you anything. Plenty of people do both.

Ravioli is a free-to-play prediction market where you call real events with Sense, our free in-game currency, and real prizes are on the line.

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