Washington Prediction Markets and the Toughest Online-Gambling Law in America

No — not in any form Washington’s own courts and regulators recognize as lawful. As of August 2, 2026, a King County Superior Court judge has found that Kalshi’s event contracts are likely illegal gambling under state law and has granted the state a preliminary injunction, with a final order barring the company from continuing scheduled to land August 5, 2026. The state’s position, unchanged since March, is that a wager on a sporting event, an election or a public-health statistic is gambling under the Washington Gambling Act no matter what financial packaging surrounds it, and that offering it online in Washington is prohibited.

What makes the answer harder than a flat “banned” is the mechanism. Washington did not pass a new statute aimed at prediction markets the way Minnesota did. It reached for laws it already had — the Gambling Act and the Consumer Protection Act — and asked a judge to apply them. That approach has proven fast and effective, but it also means the market’s fate here is tied to a preemption question that is being fought all the way up the federal appellate ladder. Should a higher court ultimately decide that the Commodity Exchange Act displaces Washington’s gambling authority over these specific contracts, the ground could shift. Until then, the practical reality for a Washington resident is that the state has won every round on its home turf, the largest operator has been ordered to stop, and the door is closing rather than opening.

Everything about Washington’s posture traces back to a single provision most other states never enacted. Under RCW 9.46.240, “whoever knowingly transmits or receives gambling information by telephone, telegraph, radio, semaphore, the internet, a telecommunications transmission system, or similar means” is guilty of a class C felony. The statute reaches not just operators but anyone knowingly installing or maintaining the equipment used to move that information. You can read the current text on the Washington State Legislature site at app.leg.wa.gov.

That history is why the Washington State Gambling Commission tells residents plainly, on its own online-gambling FAQ, that “it is a class C felony to knowingly transmit or receive gambling information by telephone, internet, or any other similar means,” and that “you are violating Washington State law if you knowingly gamble through an online gambling website.”

The Commission’s working definition of gambling is the lever the state has pulled against Kalshi. It describes three ingredients: staking something of value, on a contest of chance or a future event, under an agreement that a prize goes to a particular outcome. A “yes” contract on a football game, priced in cents and paying a dollar if it hits, checks every box in that description. From Olympia’s vantage point, the exchange wrapper does not remove the wager; it just relabels it. That is the argument the state carried into court, and so far it has carried the day.

The confrontation compressed into roughly five months, from the AG’s first filing to a court order on the brink of taking effect. The dated sequence below tracks it.

Brown Sues in State Court, by Design

On Friday, March 27, 2026, Nick Brown filed suit against Kalshi in King County Superior Court, accusing the company of skirting what his office called “some of the most restrictive gambling laws in the United States.” The complaint alleged that Kalshi runs an unlicensed online gambling operation offering point spreads, over/under lines and proposition bets on sports, alongside contracts on elections and other real-world outcomes — the AG’s release later pointed to markets on measles case counts and the outcome of a child-trafficking hearing as examples of how far the menu ranged. The two hooks were the Washington Gambling Act, which the state says the contracts violate outright, and the Consumer Protection Act, which lets the AG pursue civil penalties and restitution. Brown sought to stop the activity, claw back money lost by Washington residents, and secure a preliminary injunction to halt operations immediately. The complaint is posted on the AG’s site; the filing carries the caption State of Washington v. KalshiEX LLC.

Choosing state court was not an accident of geography. Washington’s whole theory is that this is a state gambling-law matter, and its home courts are where its 2006 felony statute and its Gambling Commission definitions carry the most weight. Kalshi understood that too, which set up the next fight.

The Removal-and-Remand Skirmish That Decided the Forum

Kalshi’s standard playbook is to get in front of a federal judge, where the argument that CFTC-registered exchanges answer only to federal law lands best. So it removed Brown’s case to the U.S. District Court for the Western District of Washington in Seattle, docketed as State of Washington v. KalshiEX LLC, No. 2:26-cv-01062-JCC. The company wanted the preemption question decided in a forum built for it.

It did not get the chance. In May 2026, Senior U.S. District Judge John C. Coughenour remanded the case to King County Superior Court, reasoning that Washington’s complaint sought to enforce its own gambling laws and that a defendant’s plan to raise a federal defense does not, by itself, create federal jurisdiction. The distinction is technical but decisive: preemption is something Kalshi can argue as a shield in state court, but it is not enough to convert the state’s enforcement action into a federal case. Kalshi appealed the remand and asked the district court to freeze proceedings while the appeal ran, warning that letting the state case advance could produce conflicting rulings. That request is what carried the dispute to the Ninth Circuit.

July 21: The Injunction

Back in King County Superior Court, Judge John McHale took up the state’s motion for a preliminary injunction and, on July 21, 2026, granted it. He found that Washington was likely to prove Kalshi’s event contracts violate both the Gambling Act and the Consumer Protection Act, and that the state had shown “a likelihood of actual and substantial injury to Washington consumers from illegal gambling activities” absent an order. Weighing the equities, McHale concluded the public interest and the risk to consumers outweighed the harm to Kalshi. Brown called the ruling “the first step toward holding Kalshi accountable for their brazen violations of Washington law.”

A preliminary injunction is a likelihood finding, not a final judgment on the merits — the same procedural posture as most of the orders around the country. But it is the substance that matters here: a Washington judge looked at Kalshi’s sports and event contracts and saw illegal gambling, not a novel financial instrument. The parties were given until August 3 to submit their positions on the precise terms, with a final order scheduled to issue August 5, 2026. That is the order that will actually force Kalshi to stop offering the contracts to Washington residents, which is why, in the narrow window of early August 2026, some of these apps may still be reachable in the state even as the legal outcome is settled.

Robinhood’s Preemptive Strike

Rather than wait its turn, Robinhood went on offense. Around March 30, 2026 — reported at the start of April — Robinhood filed a federal lawsuit against Washington seeking to block the state from using its gambling laws against the event contracts it distributes, including Kalshi’s and those from ForecastEx. Robinhood’s argument is the mirror image of the state’s: because the contracts trade on exchanges the Commodity Futures Trading Commission oversees, federal law gives the CFTC exclusive authority and Washington’s position is preempted. The suit named Washington’s move against Kalshi as evidence of an immediate threat that Robinhood, which offers contracts on sports, politics, entertainment and weather, would be next.

The Robinhood case keeps a federal track alive even after the Kalshi matter was bounced back to state court, and it is a reminder that the platforms are not monolithic. Robinhood is a distributor of event contracts, not the exchange that lists them, and its litigation posture reflects a brokerage betting that the federal-instrument theory will ultimately prevail. Whether it does depends on courts well above Seattle.

The Ninth Circuit Declines to Hit Pause

On May 21, 2026, the same three-judge Ninth Circuit panel weighing the region’s biggest prediction-market appeal — Judges Ryan D. Nelson, Bridget S. Bade and Kenneth K. Lee — issued a series of orders within hours of one another, each refusing to stay state-court proceedings while appeals played out. Two of those denials covered Washington and Nevada. In the Washington matter, the panel found Kalshi had not shown a strong likelihood of success on the merits or that continued state-court litigation would cause it irreparable harm. The upshot was that Brown’s case could keep moving in King County even as the jurisdictional questions churned on appeal — which is exactly what happened, culminating in McHale’s July injunction two months later.

The larger appeal in front of that panel is the consolidated Nevada case, argued April 16, 2026, in which Kalshi, Robinhood and Crypto.com are contesting a district-court ruling that their sports contracts are not swaps. A decision there is pending as of August 2, 2026, and it is the single ruling most likely to reshape Washington’s fight: if the Ninth Circuit sides with the states, it collides head-on with the Third Circuit’s April 2026 New Jersey decision going the other way, and a split like that tends to pull the Supreme Court in.

Underneath the docket entries sits one unresolved question, and Washington’s version of it is unusually stark because the state’s law is so absolute. When a Washington resident clicks “yes” on a game outcome, are they buying a federally regulated derivative that Olympia has no power to touch, or making the exact online wager that RCW 9.46.240 turns into a felony? Kalshi’s answer is that its contracts are a form of swap listed on a designated contract market, and that Congress handed the CFTC exclusive authority over such trading, leaving no room for a state gambling regulator. Washington’s answer is that its statutes describe the conduct precisely, that the Gambling Commission’s own three-part test captures these contracts cleanly, and that a company cannot escape a state felony statute by routing the same bet through a commodities exchange.

Judge McHale’s ruling shows how a court can accept the state’s framing without resolving the grand federal debate. He did not have to declare the contracts categorically outside CFTC authority; he only had to find Washington likely to succeed in showing they function as illegal gambling here, and that Kalshi’s federal defense was not strong enough to stop an injunction. Coughenour’s remand did similar work at the jurisdictional level, keeping the merits of preemption as a defense rather than a jurisdictional trump card. The preemption question is real and still open at the appellate level, but Washington’s courts have repeatedly declined to let it short-circuit the state’s enforcement — and that pattern, more than any single quote, is the story of this state.

Stripped of the branding, a prediction market is a place to buy and sell contracts that pay a fixed amount if a stated event happens and nothing if it does not. Each contract trades somewhere between one cent and 99 cents, and the price doubles as the market’s estimate of the odds: a “yes” at 60 cents implies the crowd sees roughly a 60 percent chance, and it settles at a dollar if the event occurs. The gap between your entry price and the dollar payout — or zero — is your gain or loss.

Structurally, the difference from a Washington tribal sportsbook is who sits on the other side of your trade. At a licensed book, the house sets the line, takes your action, and profits from the built-in margin; you are betting against the operator. On a true prediction exchange, you are matched against another user who took the opposite side, and the platform earns a fee on the transaction rather than a bookmaker’s edge. That order-book design is the technical basis for the industry’s claim that these are financial instruments rather than bets — and it is precisely the distinction one judge elsewhere dismissed as “sophistry to the nth degree,” a skepticism that Washington’s courts have echoed in substance. For a resident, the mechanics matter less than the legal conclusion: Washington has decided the payout structure is a wager regardless of who is on the other side.

The offerings here stretch well beyond sports, and the AG’s filings used that breadth against the operators rather than in their favor. The main categories:

Nothing in Washington’s action carves out the non-sports categories as safe. The state’s theory reaches the whole model, which is why the remedy here is aimed at the operator’s ability to offer any of it to Washington residents, not just the sports lines.

The contrast between these apps and a legal Washington sportsbook is unusually sharp, because Washington built one of the most closed sports-betting systems in the country. When Gov. Jay Inslee signed legalization on March 25, 2020, the law authorized wagering only in person at tribal casinos under Gambling Commission oversight — no statewide mobile app, no commercial online books, with sports betting live at around a dozen-plus tribal properties since fall 2021. There is no legal way to bet sports from your couch in Washington through a licensed operator; you have to be on tribal casino grounds. You can read the fuller picture on our Washington sportsbooks page and compare states on the online sportsbooks by state index, with the national view on the online sportsbooks hub.

That closed retail system is exactly why prediction markets found an opening here — and why the state reacted so hard. A licensed Washington sportsbook operates under state and tribal oversight, verifies age at 21, feeds tax revenue and honors the state’s responsible-gambling framework. An event-contract app reaching a Washington phone answered to none of that: no tribal compact, no state license, no Washington tax, an age floor often set at 18, and no connection to the Gambling Commission’s oversight. To Olympia, a national exchange piping sports contracts into the state was not a clever financial product but an end run around a system the tribes and the state negotiated carefully — and around the felony statute that underpins all of it. The legal distinction the platforms draw between a “contract” and a “bet” does not survive contact with Washington’s definitions, which is the whole reason the injunction exists.

Even setting the injunction aside, a Washington resident trading these contracts would face two practical problems the marketing rarely mentions. The first is tax uncertainty. Kalshi does not supply 1099-B forms for its event contracts, the IRS has published no formal classification for prediction-market winnings, and whether gains count as gambling income, capital gains or Section 1256 contract income remains genuinely unsettled as of August 2, 2026. Reporting can also differ depending on whether a contract is exchange-native or distributed through a brokerage, so no single rule covers every app. None of this is tax advice; it is a flag that the paperwork is murkier than a W-2G from a casino, and the responsibility to report lands on the trader.

The second gap is consumer protection, and it is wider in Washington than almost anywhere because the state’s own safeguards are strong. A CFTC-regulated exchange sits outside Washington’s gambling-protection machinery entirely: there is no state self-exclusion registry to enroll in, no Gambling Commission complaint process to appeal to, no state-supervised dispute resolution, and frequently an 18-year-old minimum age against the 21 required to bet at a tribal book. FanDuel Predicts is the notable exception, having voluntarily built in deposit limits, self-exclusion and outside behavioral-health support — but that is one operator’s choice, not a legal requirement, and it does not extend to the platform Washington actually sued. For a state that treats problem-gambling protection as a public responsibility, that missing safety net is a large part of what turned regulators against these markets in the first place.

Washington belongs to the aggressive-enforcement wing of the national map, but it got there by a different route than its peers. Nevada, the fiercest opponent, fought largely in its own state courts in Carson City and layered on a geofencing fight and a contempt threat; Washington won its injunction the same way, through a state judge applying state law, but leaned on a pre-existing felony statute no other state possesses. Minnesota passed a first-of-its-kind ban only to have a federal judge block it on July 27, 2026. Arizona secured the first district-level merits ruling for the platforms, the opposite result. New York’s AG opened a separate state-court front on July 31, 2026 seeking enormous financial penalties. Michigan and Massachusetts landed court orders of their own. Set against all of them, Washington’s edge is that it never needed new legislation — its 2006 law already said online wagering is a felony, and the fight has been about whether prediction markets fit that description. So far, its courts say they do.

What could change the picture, in rough order of impact:

• The Ninth Circuit’s consolidated Nevada ruling, pending as of August 2, 2026. A decision for the states would create a circuit split with the Third Circuit and pull Washington’s fight toward the Supreme Court; a decision for the platforms would strengthen every preemption defense, including Robinhood’s suit here.
• The August 5 final order in the Kalshi case, which converts the preliminary injunction into an operative bar and defines exactly what Kalshi must stop doing in Washington.
• Robinhood’s federal suit, the live vehicle for testing the preemption theory in Washington’s own federal district after the Kalshi case was remanded.
• A possible Supreme Court cert grant, which traders and analysts have flagged as increasingly likely once a genuine circuit split forms — the outcome that would settle the federal-versus-state question for every state at once.
• Federal legislation, such as the Prediction Markets Are Gambling Act, which would bar CFTC exchanges from listing sports-betting-style contracts and, if it ever passed, would moot the whole fight.

For a broader read on where Washington fits among all fifty states, see our state-by-state gambling guide and the national is online gambling legal overview, and the main Washington gambling sites page for the state’s wider legal landscape.

Compiled and dated August 2, 2026. Legal status in this area changes frequently; verify against primary sources before relying on any detail.

• RCW 9.46.240 (transmitting or receiving gambling information; class C felony), Washington State Legislature: app.leg.wa.gov
• Washington State Gambling Commission, online gambling FAQ: wsgc.wa.gov
• Washington Attorney General, “Washington sues online betting platform Kalshi for illegal gambling” (March 27, 2026): atg.wa.gov
• Washington Attorney General, “Judge finds Kalshi’s online gambling likely violates state law” (July 21, 2026): atg.wa.gov
• State of Washington v. KalshiEX LLC, King County Superior Court No. 26-2-10264-3 SEA; federal remand docket No. 2:26-cv-01062-JCC (W.D. Wash.).
• Reuters via U.S. News, “Washington Judge Blocks Kalshi Contracts, Cites State’s Gambling Law” (July 21, 2026): usnews.com
• GeekWire, “Seattle judge deals blow to Kalshi, rejects prediction market’s federal defense” (2026): geekwire.com
• GeekWire, Robinhood sues Washington to block enforcement of gambling laws (April 2026): geekwire.com
• Northwest News Network, “Sports betting now legal in Washington state, but limited to tribal casinos only” (March 25, 2020): nwnewsnetwork.org
• Rousso v. State, Washington Supreme Court (2010), upholding RCW 9.46.240 against a Commerce Clause challenge.