Wisconsin Sues Coinbase, Kalshi, Robinhood Over Event Contracts

Peter Zhang Apr 24, 2026 11:47

Wisconsin targets Coinbase, Kalshi, and others for allegedly illegal sports betting via event contracts, escalating state-federal regulatory tensions.

Wisconsin's Attorney General Josh Kaul has filed lawsuits against Kalshi, Coinbase, Robinhood, Polymarket, and Crypto.com, accusing them of facilitating illegal sports betting under the guise of "event contracts." The complaints, filed on April 23 in Dane County, aim to block these platforms from offering sports-related markets to Wisconsin residents, citing violations of state gambling laws.

The crux of Wisconsin's argument is that these platforms' event contracts—financial instruments tied to real-world outcomes such as game results or election outcomes—amount to unlicensed sports betting. According to the filings, Kalshi's sports contracts account for nearly 90% of its revenue, with annualized earnings from these products exceeding $1 billion. Robinhood and Coinbase are also under scrutiny for integrating Kalshi-powered prediction markets into their platforms, enabling users to trade on outcomes spanning sports, politics, and macroeconomic data.

State vs. Federal Tug-of-War

Wisconsin's legal action underscores a growing divide between state and federal authorities over the regulation of prediction markets. While platforms like Kalshi argue that their offerings fall under federal oversight by the Commodity Futures Trading Commission (CFTC), states such as Wisconsin and Nevada have treated these contracts as unlicensed gambling. A Nevada judge recently extended a ban on Kalshi’s sports markets, and similar enforcement actions have emerged in Arizona and Tennessee.

At the federal level, the CFTC has occasionally sided with platforms, viewing event contracts as derivatives rather than bets. However, state regulators have increasingly pushed back, leveraging local gambling laws to curtail these products. This regulatory uncertainty has led to a patchwork of enforcement actions across the U.S., leaving platforms and users in legal limbo.

Broader Implications for the Industry

The implications of Wisconsin's lawsuit extend beyond state borders. Prediction market platforms have gained traction by offering users a way to hedge or speculate on real-world outcomes, blurring lines between traditional financial instruments and gambling. If states succeed in classifying event contracts as illegal betting, it could force platforms to overhaul their business models—or risk losing access to key markets.

Companies like Robinhood and Coinbase have increasingly leaned into prediction markets as a growth area. Robinhood's event contract trading hub has reportedly processed billions of dollars in volume, while Coinbase offers similar services nationwide, attracting scrutiny from regulators in states like New York.

For traders, the regulatory uncertainty adds risk to participating in event-based prediction markets. While the potential for high returns remains attractive, users should be aware of the legal risks tied to these markets' shifting regulatory status.

What’s Next?

Wisconsin's lawsuit could set a precedent for how other states approach prediction markets, especially as federal courts continue to weigh in. Kalshi recently secured a favorable ruling from a federal appellate court limiting New Jersey’s enforcement powers, but that hasn’t deterred other states from pursuing legal action.

Market participants should watch for further developments, particularly any federal rulings that might clarify whether event contracts fall under derivatives regulations or gambling laws. The outcome could shape the future of prediction markets and their viability in the U.S.

• wisconsin
• sports betting
• kalshi
• coinbase
• robinhood