Where Things Stand Legally
Washington Attorney General Nick Brown filed a civil lawsuit against Kalshi on March 27, 2026 in King County Superior Court, arguing its event contracts constitute illegal gambling under Washington state law. Kalshi attempted to move the case to federal court, was remanded back to state court, and on May 21, 2026 the Ninth Circuit denied its request for a stay.
Polymarket was not named in the Washington AG's lawsuit. However, on the same date the Ninth Circuit issued its Washington ruling, it also denied a stay in Nevada v. Blockratize, Inc. (No. 26-1343) — Blockratize being Polymarket's parent company. That Nevada case involves enforcement actions against Polymarket directly, and the Ninth Circuit's skeptical posture toward federal preemption arguments affects both platforms in states within its jurisdiction, including Washington.
The broader federal landscape is moving in two directions simultaneously. The Third Circuit ruled in April 2026 that sports event contracts are swaps under the Commodity Exchange Act, supporting CFTC preemption over state gambling law. The Ninth Circuit, which covers Washington, has been considerably less favorable to that argument. A circuit split is likely, and the prediction markets space widely expects the issue to reach the Supreme Court. Our broader guide on where prediction markets are legal covers the national picture in more detail.
Washington's Online Gambling History
Washington is not a neutral state when it comes to online gambling. It criminalized online poker in 2006, making participation a Class C felony, and maintained that position longer than almost any other state. Daily fantasy sports have had a complicated legislative path in Washington, and sports betting remains limited to tribal casinos rather than mobile platforms.
That regulatory culture is relevant context for how Washington is likely to treat prediction markets going forward. The AG's lawsuit against Kalshi cited RCW 9.46.0237, Washington's gambling statute, and argued that buying a Yes contract for $0.40 on the chance an event resolves Yes is functionally gambling under that definition. The state's position is that CFTC preemption does not override Washington's authority to regulate what it characterizes as gambling activity within its borders. To understand why Polymarket and Kalshi dispute that framing, see our explainer on how event contracts are structured.
What Washington Residents Can Currently Trade
As of 2026, Polymarket is accessible to Washington residents and is not listed among the excluded states in the platform's bonus eligibility terms. The full catalog is available, though the legal situation is active and access could change if Washington brings a direct enforcement action against Polymarket or if a court issues an injunction.
Sports
Washington sports markets cover the Seahawks, Mariners, Kraken, Sounders, and Storm across major leagues. College sports include the Huskies, Cougars, and Gonzaga. Since Washington has no legal mobile sportsbook, event contracts are one of the few federally regulated options for taking positions on Washington team outcomes. Sports contracts are the category most exposed to state enforcement risk given the AG's focus on sports-related gambling claims in the Kalshi case. For a wider view of what this category covers, see our overview of sports prediction markets.
Politics and elections
Political markets are active and cover Washington-specific contests alongside national races. The 2026 Washington gubernatorial race, Senate and House contests, and federal-level outcomes including presidential markets all trade on Polymarket. Political markets are less directly targeted by the state's enforcement theory, which focuses on sports-style gambling claims.
Climate and weather
Seattle and other Washington cities appear in daily temperature and rainfall markets. Broader climate contracts cover snowpack levels, Atlantic hurricane activity, and seasonal milestones relevant to Pacific Northwest weather patterns. Settlement is tied to verified National Weather Service data.
Economics and crypto
Federal Reserve rate decisions, inflation prints, jobs reports, trade policy, and gas price markets trade actively. Crypto markets cover Bitcoin, Ethereum, Solana, and other assets through price threshold and short-cycle contracts. Because Polymarket runs on USDC and Polygon, Washington users in the crypto ecosystem will find the funding model familiar.
Culture and geopolitics
Culture markets cover award shows, box office rankings, streaming charts, and entertainment outcomes. Geopolitics and tech markets cover international conflicts, AI milestones, and major corporate events. These categories are furthest from Washington's enforcement theory, which centers on gambling-style contracts rather than information-based prediction markets.
How to Sign Up From Washington
Account creation works the same in Washington as anywhere else Polymarket operates. Whether access remains available long-term depends on how the legal landscape develops, particularly if Washington files a direct action against Polymarket or if the Ninth Circuit issues a ruling that reshapes the preemption question.
- Download the app: Find Polymarket US in the App Store. Android and web access are also available alongside the iOS app.
- Create your account: Register with email, Apple, or Google. Enter your full legal name, date of birth, and Washington address.
- Complete identity verification: Submit a government-issued photo ID. KYC is required under CFTC rules before any trading or withdrawal is enabled.
- Fund with USDC: Transfer USDC from an exchange like Coinbase, or use MoonPay inside the app to buy USDC with a debit card or bank account. Minimum deposit to qualify for the welcome bonus is $20.
- Enter an invite code: A valid promo code at sign-up activates the deposit $20, get $50 trading bonus.
- Browse and trade: Use the category toolbar or the Trending and Breaking feeds to find markets. Tap a market, pick Yes or No, set your size, and confirm.
What to Watch Going Forward
Three developments will most directly shape Polymarket's access in Washington. First, whether the Washington AG expands its enforcement action to include Polymarket directly, as it currently targets Kalshi alone. Second, the Ninth Circuit's ruling in the Nevada cases involving Polymarket (Nevada v. Blockratize) and Kalshi, which will clarify whether CFTC preemption holds in the Ninth Circuit's jurisdiction. Third, any Supreme Court grant of certiorari if a circuit split with the Third Circuit solidifies.
A Ninth Circuit ruling against preemption would put Polymarket in a significantly more difficult position in Washington and other states within the circuit. A ruling for preemption would largely resolve the question in Polymarket's favor in the West. The timeline for the Ninth Circuit decision is unclear but broadly expected before the end of 2026.
For a full look at the platform itself, including fees, market depth, the USDC funding model, and the overall trading experience, see our full Polymarket review.
Washington Polymarket FAQ
Is Polymarket legal in Washington state?
The status is contested. Polymarket is currently accessible to Washington residents and is not among the platform's excluded states. However, the Washington AG has sued Kalshi over prediction market activity in the state, and Ninth Circuit rulings from May 2026 signal the court is skeptical of CFTC preemption arguments. Polymarket has not been directly sued in Washington, but the legal environment is active.
Has Washington sued Polymarket directly?
No. The Washington AG's lawsuit filed in March 2026 targets Kalshi specifically. Polymarket was named in a parallel Nevada enforcement case that reached the Ninth Circuit on May 21, 2026, but Washington has not yet filed a separate action against Polymarket.
Can you use Polymarket in Washington right now?
Yes, as of [yyyy]. Washington is not listed among Polymarket's excluded states, and the platform operates normally there. That access could change if Washington files a direct enforcement action or a court issues an injunction.
Does Polymarket work in Washington for sports markets?
Sports markets are currently available to Washington users, but they are the category most exposed to state enforcement risk. The AG's theory in the Kalshi case focuses on sports-related gambling claims, so sports contracts are the most likely category to face restriction if enforcement escalates.
How does the Ninth Circuit ruling affect Polymarket in Washington?
On May 21, 2026, the Ninth Circuit denied stays in both Nevada v. Blockratize (Polymarket's Nevada case) and Washington v. KalshiEX. That means both Nevada's and Washington's state court enforcement actions can proceed without being paused for federal review. The Ninth Circuit has been less favorable to CFTC preemption arguments than the Third Circuit, which ruled for Kalshi in April 2026.
What happens to my funds if Polymarket is blocked in Washington?
If an injunction were issued, the most likely outcome would be closure of Washington accounts and return of balances in USDC. Because Polymarket holds user funds on-chain rather than in a traditional custodial account, withdrawal mechanics would depend on the specific terms of any court order.
Is Polymarket available in Washington for political markets?
Yes, currently. Political markets are available alongside the rest of the catalog. The Washington AG's enforcement theory centers on sports gambling claims rather than political contracts, so political markets face lower direct enforcement risk than sports contracts.
What is the minimum age to use Polymarket in Washington?
18 years old. Identity verification is required before trading or withdrawals are enabled.
