Are Prediction Markets Legal? A Plain-English Guide to Kalshi, Polymarket, and the CFTC

Legal, but evolving. Here's a plain-English map of who regulates these markets and where they stand.

Ask whether prediction markets are legal in the U.S. and you will get a frustrating answer: it depends, and it is evolving. The rules sit at the intersection of federal finance law and state gambling law, and the two have been pulling in opposite directions. This guide breaks down where things stand, in plain terms, while flagging that this is one area where the details genuinely shift over time.

The key player: the CFTC

The most important name to know is the Commodity Futures Trading Commission, or CFTC. It is the federal agency that regulates futures and derivatives markets, the same category that prediction market contracts fall into. When a prediction market is "federally regulated," it means the CFTC has authorized it to operate as a designated exchange. This matters because federal oversight is what separates a legitimate, regulated prediction market from an offshore site operating in a gray area.

Kalshi: the regulated path

Kalshi built its entire business around CFTC approval. It operates as a federally regulated exchange, which has allowed it to offer event contracts to U.S. users openly and legally at the federal level. That regulated status has made Kalshi the dominant player. By recent counts it accounts for roughly 89% of tracked U.S. prediction market activity. Operating inside the rules turned out to be a powerful competitive advantage.

Polymarket: from offshore to onshore

Polymarket took a different route. For years it ran as a crypto-based platform domiciled offshore, and it officially blocked U.S. users to stay clear of American regulators. That changed in late 2025, when Polymarket secured a path back into the U.S. market under federal supervision, a notable example of an offshore platform coming in from the cold.

Why the rules loosened

The regulatory climate shifted meaningfully in 2025. Under new leadership, the CFTC adopted a more permissive stance toward event contracts and withdrew an earlier proposal that would have banned political and sports prediction markets. That move opened the door for the rapid growth in markets on elections, sports, and pop culture that followed.

The state-level fight

Here is where it gets complicated. Even with federal approval, prediction markets have run into resistance from individual states, many of which argue that certain contracts, especially sports-related ones, look like gambling and should fall under state gambling law. This has produced a genuine legal tug-of-war.

In April 2026, the CFTC sued Arizona, Connecticut, and Illinois, seeking court orders to block those states from enforcing their own rules against Kalshi. In a related case, a federal court issued an injunction that barred New Jersey from enforcing its gambling laws against Kalshi's sports-related contracts.

The central legal question is whether federal authority over these contracts overrides state gambling laws, a concept lawyers call preemption. Courts have been leaning toward the federal side, but the matter is still being litigated, and the outcome is not settled.

So, can you legally use them?

For most U.S. residents, federally regulated platforms like Kalshi operate broadly across the country, though access can vary by state and some states have pushed back. Nevada, with its distinct gambling regime, has been an exception where access has been restricted. Because the state picture is shifting through ongoing court cases, the practical answer can differ depending on where you live and when you check.

The responsible move is to confirm current availability in your own state directly on the platform before assuming anything, since this is a genuinely moving target.

The bottom line

Prediction markets are legal and regulated when run on a CFTC-approved exchange, and the federal posture has grown friendlier since 2025. The unsettled part is the clash with state gambling laws, which is still working its way through the courts. Treat the legal status as a moving target: understand who the regulator is, favor federally regulated platforms, and check your own state's current rules rather than relying on a snapshot.

Disclaimer : Market Crush reports what prediction markets and financial trends say about pop culture, for informational and educational purposes only. This is not financial, investment, legal, or betting advice, and not a recommendation to trade, bet, or invest. We report on market data; we do not facilitate or recommend trading of any kind. Odds move constantly and are current only as of the time noted.

Sources

Lines.com. (2026). U.S. prediction market legal status 2026: State-by-state guide. Lines.com. https://www.lines.com

Norton Rose Fulbright. (2026). Prediction markets at a crossroads. Norton Rose Fulbright. https://www.nortonrosefulbright.com

Sports Illustrated. (2026). Kalshi vs. Polymarket: Key differences, fees and legal status. Sports Illustrated. https://www.si.com