Is Kalshi Legal in Massachusetts? Available for Now, Under a Court Stay

Open Kalshi from a Massachusetts address today and the full slate is there — sports event contracts included — even though a Suffolk Superior Court judge ordered those sports markets shut in January. The access rests on a single order: on February 17, 2026, an Appeals Court single justice stayed the injunction while Kalshi appeals, and the appeal now sits with the Supreme Judicial Court, which heard argument on May 4 and has yet to rule. Kalshi’s election, economics, and other non-sports markets were never part of the case and trade normally.

So the practical answer: everything trades, but the sports access lasts exactly as long as the stay does — and the decision that could dissolve it may land any day. Whether Massachusetts can apply its gambling law to these contracts at all is the question the SJC has been asked to decide — as of August 2026.

What happened in Massachusetts

• September 12, 2025 — Attorney General Andrea Joy Campbell sued KalshiEX LLC in Suffolk Superior Court, alleging unlicensed sports wagering under G.L. c. 23N — no Massachusetts Gaming Commission license, users as young as 18, none of the state’s responsible-gaming safeguards. No cease-and-desist preceded it; Massachusetts went straight to court.
• January 20, 2026 — the court granted the Commonwealth a preliminary injunction against Kalshi’s sports-related contracts and denied Kalshi’s motion to dismiss.
• February 6, 2026 — the injunction was formally entered; Kalshi appealed the same day and asked an Appeals Court single justice to pause the order.
• February 17, 2026 — single justice Sabita Singh stayed the injunction “pending further order of this court or a single justice thereof” and ordered the appeal expedited. Kalshi’s sports contracts stayed live.
• March 5, 2026 — the SJC took the case on direct appellate review as Commonwealth v. KalshiEX LLC, inviting briefs on whether the federal Commodity Exchange Act preempts c. 23N.
• April 24, 2026 — the amicus wave: the CFTC filed asserting exclusive federal authority over its designated exchanges; 37 states and the District of Columbia filed supporting Massachusetts.
• May 4, 2026 — the SJC heard oral argument before the full bench and took the case under advisement.
• August 14, 2026 — the latest docket activity: the Commonwealth filed its second supplemental citation of the month. Still no decision.

What you can trade in Massachusetts right now

• Sports event contracts: available as of August 31, 2026 — but only under the February 17 stay. If the SJC affirms the injunction, the ban comes back into force, likely on short notice.
• Election markets: available as of August 31, 2026. The AG’s case covers sports-related contracts only; elections were never part of it.
• Economics, weather, and other non-sports markets: available as of August 31, 2026, unaffected by the injunction.

One caveat: Kalshi publishes no Massachusetts status page we could find, so the availability above rests on the stay order and current reporting. The platform itself is covered in our Kalshi review.

What about Polymarket and Robinhood?

Polymarket returned to U.S. trading in late 2025 by acquiring QCX, a CFTC-designated exchange, and opened access broadly by mid-2026. Massachusetts never sent it a cease-and-desist — instead, three weeks after the Kalshi injunction, Polymarket US sued AG Campbell pre-emptively on February 9, 2026, citing the risk of identical enforcement. On March 5, 2026, the federal court entered a joint stay with a built-in truce: the state agreed not to bring any enforcement against Polymarket’s sports listings until at least 14 days after Kalshi’s state appeal is resolved. The stipulation presumes Polymarket keeps listing sports contracts in the meantime — but whether the app is actually open to users physically in Massachusetts was not something we could confirm as of August 31, 2026.

Robinhood’s Massachusetts story started earlier and ended in retreat. Secretary of the Commonwealth William Galvin’s Securities Division subpoenaed it in March 2025 over March Madness event contracts, and Robinhood sued the AG and gaming commissioners pre-emptively that September. A federal judge dismissed the case as premature in November 2025, reopened it in January 2026, then dismissed it again on March 13, 2026 — noting that Robinhood represented it had stopped offering sports-related event contracts. So sports contracts are not available to Massachusetts users through Robinhood as of August 31, 2026; its appeal is in briefing at the First Circuit. Whether Robinhood still offers non-sports event contracts to Massachusetts users is not something we could verify.

Why Massachusetts is fighting

Strip away the case captions and the question is the one running through every state fight: is a contract that pays $1 if the Celtics win a swap, regulated exclusively by the CFTC because it trades on a federally designated exchange — Kalshi’s argument — or a sports wager requiring a Massachusetts Gaming Commission license under G.L. c. 23N, as the Commonwealth argues on the view that regulating gambling has been state police power all along? Our 50-state hub walks through the full doctrine, and whether these products are gambling or investing gets its own page.

Thirty-seven states and the District of Columbia lined up behind Massachusetts at the SJC. The federal regulator that licenses Kalshi lined up against it.

The state’s stake is concrete. Massachusetts legalized and licensed sports wagering under c. 23N and taxes licensed operators at 20% of online gross wagering revenue (15% retail) — worth roughly $117 million to the state in FY2024 (MGC revenue data). The AG’s core grievance, as she framed it in the suit: Kalshi pays none of that tax and follows none of the licensed operators’ rules — the 21+ age floor, deposit limits, responsible-gaming programs. Nor is it one state’s crusade: the 37 states backing Massachusetts include Nevada and Ohio, each fighting Kalshi battles of its own — see the 50-state tracker.

What could change next

Everything in Massachusetts now turns on the SJC decision. No decision date is scheduled — the court’s convention is to issue opinions within roughly 130 days of argument, which points to early September 2026, but that is a practice, not a docketed deadline (docket). If the court affirms the injunction, the sports ban returns; if it reverses, Kalshi’s sports markets stay up on much firmer footing. Either way, the ruling starts the 14-day clock on the Polymarket standstill. The smaller thread is Robinhood’s First Circuit appeal: Massachusetts filed its brief on July 24, 2026; Robinhood filed its reply August 10, and no argument date is set.

Frequently asked questions

Can I get in trouble for trading on Kalshi in Massachusetts?

Every Massachusetts action in this fight targets a platform, not a person: the AG sued KalshiEX LLC, and the Robinhood and Polymarket cases were filed by the companies themselves. Nothing in the record we reviewed involves enforcement against an individual trader. That describes the record to date, not a promise about the future.

Is Polymarket legal in Massachusetts?

Massachusetts has taken no enforcement action against Polymarket, and under the March 5, 2026 standstill it agreed not to move against Polymarket’s sports listings until at least 14 days after the Kalshi appeal resolves. Whether the app currently serves users physically in Massachusetts we could not confirm as of August 31, 2026. For how the platforms differ, see Kalshi vs. Polymarket.

When will the SJC decide the Kalshi case?

No date is set. Argued May 4, 2026, the case was still drawing supplemental citations from both sides in mid-August (docket); a decision could land any day.

Does the case affect Kalshi’s election and economics markets?

No. The suit and the injunction cover sports-related contracts only; election, economics, and other non-sports markets remain available as of August 31, 2026.

Part of our 50-state legality tracker — see every state. Last verified August 31, 2026.