Kalshi’s sports betting battle spreads to another US state

The state of Connecticut has filed a legal suit against Kalshi on Wednesday, August 26, questioning the validity of various contracts of the platform relating to sports events and adding a new dimension to a legal battle that has the potential to shape the course for cryptocurrency-related prediction markets in the United States. The state filed the lawsuit in Hartford Superior Court under the name Connecticut v. KalshiEX, LLC, No. HHD-CV-26-6230345-S. The public litigation tracker shows that Kalshi transferred the case to the federal court on the very same day under case number D. Conn. No. 3:26-cv-01382.

This disagreement extends far beyond Connecticut. Thanks to a combination of crypto-native platforms and crypto financing, prediction markets have expanded rapidly, although the platforms do not all process trades in the same manner. Artemis data shows that the total trading volume of the prediction market industry increased from about $2.0 billion on August 1, 2025, to $38.5 billion on August 1, 2026 — more than 19 times higher in just one year.

This presents important legal implications for the crypto markets in two main ways: the first scenario is if the states say that crypto products are gambling, then access to the products will be limited and liquidity may change depending on the jurisdiction. The opposite scenario is if the federal law governing derivatives is applied; in this case, the crypto platforms will have a uniform nationwide regulatory framework for their operations.

Why a Hartford lawsuit matters to crypto traders

Since 2020, Kalshi has been one of the designated contract markets (DCMs) overseen by the Commodity Futures Trading Commission (CFTC). Its argument has been quite clear; under federal derivatives law, it is the CFTC that is responsible for supervising its event contracts. The states, therefore, do not have the right to treat such contracts as gambling. Connecticut, however, disagrees with this interpretation.

“Sports event contracts are no different than sports betting and are not magically shielded by federal law from Connecticut’s commonsense consumer protection laws,” Attorney General William Tong said when announcing the lawsuit.

For crypto traders, the fight is more than a regulatory technicality. Artemis data for the week ending August 23, 2026, shows Kalshi handled about $9.10 billion in total trading volume, including roughly $1.87 billion tied to crypto markets. That puts crypto at about 20.6% of Kalshi’s weekly volume. Polymarket recorded approximately $2.04 billion in total volume over the same period, with about $224.2 million, or 11.0%, coming from crypto markets.

Although Kalshi settles event contracts in US dollars, the overall prediction market industry is increasingly linked to the cryptocurrency infrastructure. Kalshi allows cryptocurrency deposits and withdrawals, and Polymarket relies on on-chain stablecoin guarantees. If states start to cut off their citizens, the total market size of the industry is going to shrink drastically.

How the Connecticut case got here

Connecticut’s issue with Kalshi started before the lawsuit that happened this week. In December 2025, the Department of Consumer Protection ordered Kalshi, Robinhood and Crypto.com to cease offering contracts based on sporting events within the state. Kalshi sued the state’s officials the following day, claiming that its markets, regulated by federal law, were not subject to the state’s gambling laws.

Thus far, that claim has faced difficulties in court. On August 10, U.S. District Court Judge Vernon Oliver rejected Kalshi’s motion for preliminary injunction, ruling that the sports contracts in question are not “swaps” according to the Commodity Exchange Act and that federal law does not override Connecticut’s sports-wagering law.

Kalshi decided to contest the ruling. Following this, the case reached a higher court under the name of KalshiEX LLC v. Cafferelli, No. 26-2239, registered on August 12.

According to Governor Ned Lamont, the present lawsuit is associated with the Connecticut sports betting regulations that state lawmakers adopted in 2021, which were intended to create “a safe, responsibly regulated market for Connecticut consumers, not to open a free-for-all on sports betting.”

Connecticut just filed this lawsuit to shutdown @Kalshi immediately, but they’re okay with other prediction markets operating there in the meantime. This is the latest in a line of arbitrary and inconsistent enforcement by the states, which shows this has nothing to do with… pic.twitter.com/ZVnfeL4vnY

— Jovy Dedaj (@JovyDedaj) August 26, 2026

Jovy Dedaj, the head of litigation at Kalshi, expressed that Connecticut is taking “a line of arbitrary and inconsistent enforcement” in a post on X, noting that other similar prediction markets continue to operate in the state. “This unequal treatment is exactly why federal oversight is necessary,” Dedaj wrote.

A nationwide standoff the CFTC has joined

Connecticut is only one piece of a wider state-federal confrontation. Washington secured preliminary restrictions on Kalshi, Baltimore sued both Kalshi and Polymarket, Arizona pursued criminal charges, and Illinois’ cease-and-desist action is now part of a federal preemption dispute.

The CFTC has backed Kalshi’s jurisdictional argument. In April, it sued Connecticut, Arizona, and Illinois, arguing that states cannot impose gambling restrictions on markets listed by federally regulated contract exchanges.

“The CFTC will continue to safeguard its exclusive regulatory authority over these markets and defend market participants against overzealous state regulators,” CFTC Chair Michael Selig said at the time. Connecticut has moved to dismiss that case. Economics follows the law. Artemis argues that a state-by-state framework would fragment liquidity, while federal uniformity could concentrate it in deeper national markets. Kalshi’s $22 billion valuation shows how much investors are already betting on that broader future. The legal fight over whether these products are derivatives or gambling is therefore also a fight over how large the crypto-linked prediction-market

The smartest crypto minds already read our newsletter. Want in? Join them.