Is Polymarket legal in Massachusetts?
Massachusetts is the clearest example of how a state order against one exchange leaves another untouched. Kalshi and Polymarket US list similar sports contracts under the same federal framework. In Massachusetts one is geofenced and the other is not, and the difference is entirely about who has been sued.
Massachusetts at a glance
| Question | Position as of 29 October 2026 |
|---|---|
| Does Polymarket US accept Massachusetts users? | Yes; CBS Sports’ October 22 state guide lists Polymarket as operating in every state except Nevada, with exceptions noted for Connecticut and Tennessee |
| Can residents use polymarket.com? | No; the offshore site geoblocks the United States under the January 2022 CFTC order |
| Has Massachusetts sued Polymarket? | No; Polymarket sued the state |
| Polymarket’s suit | Filed February 9, 2026 in the District of Massachusetts against AG Campbell and the Gaming Commission; no reported ruling |
| Kalshi’s position | Sports contracts barred by a January 23, 2026 preliminary injunction; appeal pending at the Supreme Judicial Court |
| Legal sportsbooks | Licensed by the Massachusetts Gaming Commission; online since March 10, 2023 |
| Minimum age for a sportsbook | 21 |
| Federal circuit | First Circuit; no prediction market ruling |
Which Polymarket a Massachusetts resident can use
There are two Polymarkets. The original polymarket.com settles in the USDC stablecoin and has been barred from US persons since the CFTC’s January 3, 2022 order against its operator, which carried a $1.4 million penalty. The product built for Americans is Polymarket US, which runs on QCX LLC, a designated contract market the CFTC approved on July 9, 2025. It takes dollars, verifies identity and location, and accepts users from 18. Reuters reported on October 27 that the CFTC is again examining whether Polymarket complied with the 2022 settlement; a probe is not a finding. The federal picture is in Is Polymarket legal in the US?
The Kalshi case that set the terms
Attorney General Campbell sued Kalshi in Suffolk County Superior Court in September 2025, arguing it ran an unlicensed sportsbook. On January 23, 2026 Judge Christopher Barry-Smith granted a preliminary injunction barring Kalshi from offering sports event contracts to anyone located in Massachusetts, and on February 6 he refused to pause it, giving Kalshi until March 9 to geofence the state. Non-sports contracts were not affected. The Supreme Judicial Court took the appeal directly and heard argument on May 4, 2026, when the justices were reported to be skeptical of Kalshi’s preemption argument. It has not ruled.
The order binds Kalshi only. Nothing in it applies to Polymarket US, Robinhood, Crypto.com or any other venue offering similar contracts, which is the same pattern seen in Nevada and Michigan.
Polymarket’s pre-emptive suit
Three days after the stay was denied, on February 9, 2026, Polymarket sued Campbell and the Massachusetts Gaming Commission in the US District Court for the District of Massachusetts, asking for an injunction against enforcement and a declaration that the Commodity Exchange Act preempts state gaming law as applied to its exchange. It cited Barry-Smith’s ruling as the evidence that enforcement against it was imminent. That suit is a federal case in the First Circuit, a different court system from the state proceedings against Kalshi. We found no reported ruling on Polymarket’s request as of October 29, and Massachusetts has not filed its own action against Polymarket.
What the state has said nationally
Massachusetts signed the brief Ohio filed for 39 states and the District of Columbia on October 7, 2026 asking the Supreme Court to hear New Jersey’s case against Kalshi, No. 26-299. Kalshi’s response is due November 9. A ruling for New Jersey would strengthen the state’s hand against every exchange; a refusal to hear the case would leave the conflict between the Third Circuit, which sided with Kalshi, and the Sixth and Ninth Circuits, which sided with the states. The First Circuit has not taken a side.
How Polymarket compares with Kalshi in Massachusetts
Kalshi’s sports contracts are blocked by court order; its other markets remain available. Polymarket US is available across categories. Both accept users from 18, three years below the Massachusetts sportsbook floor, and neither pays the state’s 20 percent tax on online sports wagering revenue. If the Supreme Judicial Court upholds the Kalshi injunction, it will give the attorney general a state-law precedent to use against Polymarket in a new case; Polymarket’s federal suit is its attempt to get a ruling first. Fees differ between the two; see our fee comparison.
What this means in practice
A Massachusetts resident can open a Polymarket US account at 18 and trade sports, economic and political contracts, or bet with a licensed sportsbook at 21. What could change that, in rough order of likelihood: a Supreme Judicial Court decision for the state followed by an action against Polymarket; a ruling in Polymarket’s federal case; or a Supreme Court decision in No. 26-299. This describes current enforcement; it is not a legal opinion on whether trading is lawful.
Frequently asked questions
Is Polymarket legal in Massachusetts?
Polymarket US, the CFTC-regulated exchange run by QCX LLC, is available in Massachusetts and no Massachusetts court order restricts it as of October 29, 2026. Polymarket sued the attorney general and the Gaming Commission in federal court in February 2026 to block enforcement, and we found no reported ruling. That is the enforcement position, not a legal opinion.
Why is Kalshi blocked in Massachusetts but not Polymarket?
Because the attorney general sued Kalshi, not Polymarket. A Suffolk County judge granted a preliminary injunction against Kalshi’s sports contracts on January 23, 2026, and that order binds only Kalshi. Massachusetts has not filed a comparable case against Polymarket.
What is the betting age in Massachusetts?
21 for licensed sportsbooks regulated by the Massachusetts Gaming Commission. Polymarket US accepts users from 18.
Which court will decide Polymarket’s case in Massachusetts?
Polymarket’s suit is in the US District Court for the District of Massachusetts, in the First Circuit, which has not ruled on prediction markets. The state Supreme Judicial Court’s pending decision in the Kalshi case, and any Supreme Court ruling in No. 26-299, will weigh heavily on it.
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- Is Kalshi legal in Massachusetts? The Supreme Judicial Court case
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- Is Kalshi legal in your state? The 50-state tracker
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Sources
- iGaming Business, Massachusetts judge rules against request by Kalshi, February 2026, for the injunction, the March 9 deadline and Polymarket’s February 9 suit.
- CommonWealth Beacon, Clash with prediction market giant Kalshi reaches SJC, for the Supreme Judicial Court appeal.
- CBS Sports, Status of Kalshi and Polymarket in all 50 states, 22 October 2026, for availability; a third-party guide.
- Supreme Court of the United States, Brief of Ohio and 38 other states and the District of Columbia, No. 26-299, 7 October 2026.
- CFTC, QCX LLC d/b/a Polymarket US, and the January 3, 2022 order; Massachusetts Gaming Commission, sports wagering. Other dates are from our change log.
18+ only. Prediction market contracts carry real financial risk. This page is analysis, not legal, financial or betting advice. If gambling stops being fun, help is available at 1-800-GAMBLER.