Reviewed as of June 15, 2026. This is a general research overview, not legal advice. Always check official platform eligibility pages, local rules, and qualified legal guidance before trading.

Prediction markets are easy to group together from the outside. Polymarket and Kalshi both let people trade on events. Both can show prices that look like probabilities. Both have markets on politics, economics, sports, culture, and world events.

Legally, though, they are not the same thing in the United States.

That distinction matters because many user questions start from the wrong premise: “Is prediction-market trading legal in the US?” The better question is usually more specific:

Which platform, which product, which user location, and which regulatory framework?

This article gives a plain-English map of the landscape as of mid-June 2026.

The short version

Kalshi and Polymarket sit in very different US regulatory positions.

Kalshi is a US-regulated event-contract exchange. It is registered with the Commodity Futures Trading Commission (CFTC) as a designated contract market, which means it operates inside the US derivatives regulatory system.

Polymarket is a crypto-based prediction market that settled with the CFTC in 2022 after the agency said it had offered off-exchange event-based binary options without proper registration. After that, Polymarket blocked US users.

So the simple answer is not “prediction markets are legal” or “prediction markets are illegal.” The useful answer is: Kalshi and Polymarket are structured differently, regulated differently, and available to US users differently.

Why Kalshi is different

Kalshi was built around the regulated US exchange model. The key fact is that Kalshi is a CFTC-regulated designated contract market.

That does not mean every possible market is automatically allowed. It means Kalshi operates within a federal derivatives framework where event contracts can still raise questions about public interest, gaming, elections, market integrity, and state-level conflicts.

The important practical point for users is this:

Kalshi access is not the same question as Polymarket access.

Kalshi is not simply “the US version of Polymarket.” It has a different legal structure, different market rules, different listing constraints, and different eligibility checks.

Why Polymarket is different

Polymarket grew as a crypto prediction market. Users trade event outcomes using crypto rails, and the platform’s resolution process is tied to market rules and oracle/dispute mechanics.

The major US regulatory event was the CFTC’s January 2022 order against Blockratize, Inc. d/b/a Polymarket. The CFTC said Polymarket had offered off-exchange event-based binary options contracts and had not registered as a designated contract market or swap execution facility. The order required Polymarket to pay a $1.4 million civil monetary penalty and wind down non-compliant markets.

After that, Polymarket blocked access to US users.

That is why US Polymarket questions often get confusing. People can still see Polymarket prices, screenshots, news coverage, and social discussion. But seeing the market is not the same as being eligible to trade it from the US.

Why people confuse them

The confusion is understandable because the products feel similar at the user-interface level.

Both platforms show event questions. Both have Yes/No-style outcomes. Both have prices that users read as implied probabilities. Both can produce the same emotional experience: “the market moved, what changed?”

But the legal wrapper is different.

A helpful mental model is:

Similar user behavior does not mean identical regulatory status.

A prediction market can look like a betting app, a derivatives exchange, a crypto app, a forecasting tool, or a financial market depending on the product design, asset structure, user jurisdiction, and legal framework.

Why 2024–2026 made this more visible

The legal debate became more visible because prediction markets moved from niche forecasting tools into mainstream political, sports, and news discussion.

Election markets were a major turning point. Kalshi fought with the CFTC over whether certain political control markets could be listed, and court decisions allowed Kalshi to relaunch congressional control markets after the CFTC had tried to block them. That did not settle every future question, but it showed that event contracts are now being actively tested in courts, agencies, and public debate.

At the same time, Polymarket became widely cited during major news cycles, especially around elections and geopolitical events, even while US access remained restricted. That created a strange situation: US users could hear about Polymarket everywhere, but still not necessarily be allowed to use it.

What users should check before trading

If you are trying to understand whether you can use a prediction-market platform, start with these questions:

  1. Which platform is it? Kalshi and Polymarket are not interchangeable.
  2. Where are you located? Eligibility can depend on country and sometimes state or local rules.
  3. What are the platform’s official eligibility rules? Do not rely on Reddit comments or screenshots.
  4. What type of market is it? Elections, sports, financial events, crypto, and geopolitical markets can raise different issues.
  5. Is the product regulated, restricted, or unavailable in your location? If unclear, assume you need official guidance.

The safe rule is simple: use official platform documentation first. If money is involved and the answer matters, get qualified legal advice.

What this means for prediction-market users

The most practical lesson is that “prediction market” is not a single legal category in everyday use.

Kalshi and Polymarket can both help people read expectations about the future, but they are not the same legal object. Kalshi operates through a CFTC-regulated exchange model. Polymarket historically ran into US enforcement issues for offering event-based binary options without registration and has blocked US users since.

That is why the answer to “is this legal in the states?” is usually not one sentence. It depends on the platform, user location, eligibility rules, and market type.

How Catalyst fits

Catalyst is not a legal-advice tool. Its job is narrower: helping prediction-market users understand why markets move and what context, sources, or rules may be driving the chart. Legal eligibility is separate and should always be checked through official platform sources.

// Catalyst

Understand why a market moved

Catalyst helps prediction-market users connect chart moves to the rules, sources, events, and context behind them — directly on Polymarket and Kalshi.

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