Washington state has joined a growing list of jurisdictions cracking down on prediction market platforms, filing a civil lawsuit against Kalshi accusing the company of operating an illegal online gambling service under the guise of “prediction markets.”

Washington Attorney General Nick Brown announced the lawsuit on March 27, 2026, claiming that Kalshi’s platform allows users to place bets on sports, elections, entertainment events, and thousands of other outcomes — activities that allegedly violate the state’s strict Gambling Act and Consumer Protection Act.

“Kalshi really is just a bookie with a fancy name,” Brown said in a statement. “Kalshi attempts to skirt state law by branding its betting platform as a ‘prediction market,’ but whatever Kalshi chooses to call it, Kalshi’s operations clearly fall under the definition of illegal gambling in Washington.”

The lawsuit, filed in King County Superior Court, seeks to shut down Kalshi’s operations in the state, recover money lost by Washington residents on the platform, and impose civil penalties.

### How Kalshi Works — and Why Washington Says It’s Gambling

Kalshi’s mobile app and website let users trade contracts on real-world events, where the payout depends on whether a specific outcome occurs. The state argues this structure mirrors traditional sportsbooks: users see events, odds, and potential payouts, which is “exactly how sportsbooks and other gambling operations function.”

The complaint highlights Kalshi’s own marketing, including an advertisement suggesting users could “bet on the NFL even though we live in Washington,” as evidence that the company knowingly targets residents in states with strict anti-gambling laws.

Kalshi has positioned itself as a financial innovation platform rather than a betting site, allowing users to “bet on anything” from election results to sports outcomes and even broader events. However, Washington officials reject this framing.

“Kalshi wants people betting on almost everything possible in life — the outcome of elections, Supreme Court cases, even wars,” Brown added. “It’s a lie, and it’s illegal.”

### Broader Context: Rising Regulatory Scrutiny

Washington’s action is the latest in a series of legal challenges facing prediction market operators in the United States. Several states have begun treating these platforms as unlicensed gambling operations, even as the industry argues it provides valuable information markets and hedging tools.

Kalshi, which has gained popularity for its election and sports contracts, has previously faced regulatory hurdles at both state and federal levels. The company maintains that its products are distinct from traditional gambling because they function more like event-based financial contracts.

In response to the lawsuit, Kalshi has pushed back, noting that the suit was filed just before a scheduled meeting with the Attorney General’s office. The company has disputed some characterizations, such as claims of offering “war markets.”

### What’s Next?

The civil suit emphasizes consumer protection. Under Washington law, individuals who lose money on illegal gambling activities may be entitled to recover their losses.

This case could have significant implications for the future of prediction markets in the U.S., especially as more states examine whether these platforms cross the line into regulated gambling territory.

The CoinDesk app screenshot in the story’s imagery highlights Kalshi’s presence on mobile devices, showing its “Trade the Big Game” branding and focus on sports, NFL, NBA, crypto, and tech events — precisely the type of offerings now under legal fire.

As the lawsuit progresses, the crypto and fintech communities will be watching closely to see whether prediction markets can survive increasing state-level pushback or if tighter regulations will reshape the industry.