Is Coinbase legal in Wisconsin?

Wisconsin's Department of Justice filed a complaint to abate a public nuisance in Dane County Circuit Court on April 23, 2026, later numbered 2026CV001284. Two of its defendants are Coinbase companies: Coinbase Global, Inc., which the complaint calls the parent of every Coinbase entity it names, and Coinbase Financial Markets, Inc., a wholly owned subsidiary based in New York (¶¶19-20, pp.6-7). Kalshi's five companies and three Robinhood companies are named in the same caption. The department's announcement that day described this as one of three suits, with separate complaints against Polymarket and Crypto.com.

In the state's telling, Coinbase reaches Kalshi's contracts through a partnership: Coinbase customers place orders in their Coinbase accounts, and "the trades (at least some of them) are executed on Kalshi's exchange" (¶72, p.24). The complaint alleges that customers fund those trades by depositing money into accounts Coinbase controls. Coinbase then holds the funds until a position is sold or settles, it says, and pays the winning side minus its transaction fees (¶¶74-75, p.25). It points to moneyline, point spread, over/under and proposition contracts on Coinbase's sports page as of April 3, 2026 (¶77, pp.27-29).

The single count says those facts make Coinbase, like Kalshi and Robinhood, a commercial gambler under three parts of Wis. Stat. § 945.03(1m): receiving or forwarding bets for gain, acting for gain as custodian of what is bet, and using a wire communication facility for bets (¶¶86-91, pp.31-33). Repeated violations, the complaint argues, are "per se a public nuisance" (¶92, p.33). These are the state's allegations, and no court has ruled on them.

A declaration and an injunction, both limited to sports. The declaration would say that "by making sports-related event contracts available for trading by customers located in Wisconsin" the defendants are violating § 945.03(1m)(b), (c) and (g) and causing a public nuisance. The injunction, preliminary and then permanent, would bar them and their officers, employees and agents from doing so (pp.33-34). Beyond that it asks only for any other relief the court finds just.

The relief section asks for no damages, penalties or restitution. A footnote adds that it "does not seek to void or otherwise invalidate outstanding sports-related event contracts" where a Wisconsin customer is a party (p.34 n.20). Nothing in the complaint asks the court to stop non-sports contracts. None of this has been granted in any filing we read.

Kalshi moved it there the day after filing. The notice of removal of April 24, 2026 took the case to the U.S. District Court for the Western District of Wisconsin, No. 3:26-cv-00378, and records that Coinbase Global and Coinbase Financial Markets "consent to removal" (ECF 1, p.1). The grounds are Kalshi's: federal-question jurisdiction, and two parts of the federal officer removal statute, 28 U.S.C. § 1442(a)(1) and (a)(2) (pp.5, 8, 13). Kalshi's notice argues that event contracts are swaps under the Commodity Exchange Act and that the CFTC has exclusive jurisdiction over trading on a designated contract market (¶¶1-2, p.2).

The state answered with a motion to remand on May 14, asking the court to send the case back to state court under 28 U.S.C. § 1447(c) (ECF 27, p.1). Five days later Robinhood asked to transfer the case to the Eastern District of Wisconsin, where the CFTC's suit against the state was pending, and the motion states that the two Coinbase companies "join this Motion" (ECF 41, p.3). Robinhood's June 10 reply says Coinbase Financial Markets and Kalshi joined it too (ECF 66, p.3). We found no ruling on either the remand or the transfer request.

In the Wisconsin filings we read, Coinbase's part has been to consent and to join, not to brief its own arguments. Elsewhere it has stated its position directly: in its suit against Illinois officials, Coinbase Financial Markets argues that "Illinois law is squarely preempted as applied to sports event contracts traded on federally regulated exchanges" (Illinois complaint, ¶1). Coinbase in Illinois follows that case.

The filings suggest not, though we could not read the step that removed it. Coinbase Global, Inc. is named in the complaint, the removal notice, the remand motion and the transfer motion. From the state's June 9 injunction motion on, the captions we read list only Coinbase Financial Markets, Inc. (ECF 62, p.1; ECF 66, p.1; ECF 69, p.1). We could not read the filing or order that dropped the parent company, so we cannot say when it left the case or on what terms. Coinbase Financial Markets, the company that gives customers access to Kalshi's contracts, remains a named defendant.

Not in any filing we found. On June 9 the state filed a motion for a preliminary injunction to stop the remaining defendants "from making sports-related event contracts available for trading by customers located in Wisconsin." It is conditional: "The State seeks a ruling on this motion only in the event the Court denies its Motion to Remand" (ECF 62, p.1).

On June 24 Kalshi, Robinhood Derivatives and Coinbase Financial Markets asked the court for more time. They sought to move their opposition from June 30 to July 10 and the state's reply from July 14 to July 24, and the state did not oppose. That filing says a hearing on the injunction motion "has not yet been scheduled" (ECF 69, p.2). We did not read whether the court granted the new dates.

The latest primary statement we found comes from a different court. A September 8, 2026 minute entry in the Eastern District records that the state's counsel gave a status update "indicating that the motions for remand and for a preliminary injunction remain pending" in the Western District (ECF 72, p.1). That is what the state's counsel said, not a ruling. We could not read the Western District's own docket after June 24, so we found no ruling and cannot rule one out.

Coinbase is not a party to it, but the suit is about the same state cases. The United States and the CFTC sued Wisconsin in the Eastern District on April 28, 2026 (No. 2:26-cv-00749). As Judge William C. Griesbach describes it, they sought to stop the state enforcing its gambling statutes against Coinbase, Kalshi, Robinhood, Polymarket and Crypto.com (decision, ECF 54, p.2). The same background section notes that remand motions in all three removed state cases were pending.

In that July 28 decision, entered July 29, Judge Griesbach denied the CFTC a preliminary injunction. He found the CFTC had not shown it is likely to prevail on its argument that the Commodity Exchange Act's definition of swaps "covers the event contracts offered by entities such as Kalshi" (p.21). He also denied the state's own motion to move that case to the Western District (p.28), the step Robinhood's transfer motion had pointed to (ECF 41, p.3). The ruling is preliminary, and it is not a ruling in the case against Coinbase.

The United States and the CFTC appealed to the Seventh Circuit on August 7, and Kalshi appealed on August 13. On September 8 the Eastern District stayed and administratively closed the CFTC's case "pending a decision on the appeals from the Seventh Circuit" (ECF 72). We found no appellate decision. Kalshi in Wisconsin follows those appeals, and Polymarket in Wisconsin covers the state's separate case against Polymarket's companies.

No order we found in Wisconsin restricts Coinbase customers. The complaint alleges that Coinbase offered sports-related event contracts to customers in Wisconsin as of April 2026 (¶78, p.29). That is the state's allegation. We could not confirm from a Coinbase document which contract categories it offers Wisconsin customers today. Nothing we read addresses deposits, withdrawals or open positions. The state's request is forward-looking and limited to sports contracts, and its footnote disclaims voiding outstanding ones. Coinbase's status in every other state is on the Coinbase legal page.

Wisconsin's case asks whether its commercial gambling and nuisance statutes reach sports contracts, and a state court ruling on that is not a ruling on federal income tax. How the people we've seen file report Coinbase event contracts, as gambling, capital gains on Form 8949 or Section 1256 contracts on Form 6781, is in Coinbase taxes.