Is Polymarket US legal in Missouri?

What Missouri has done about Polymarket US

1. Sept. 16, 2026

   Cease-and-desist

   The attorney general demanded each operator stop offering sports contracts to people in Missouri, or obtain a Gaming Commission license, pay the 10% wagering tax and fees, and bar under-21 users, within 30 days; the letters were announced Sept. 18, 2026.

   Source: Missouri Attorney General letter to KalshiEX LLC

All 5 actions in Missouri

Court cases

We track no case between Polymarket US and Missouri.

The legal backdrop in Missouri

State status

In litigationThe state and a prediction market operator are actively in court, and no order blocking the operator is in force.

Online sports betting

Legal onlineRetail and mobile sports betting; the market launched Dec. 1, 2025 after 2024 voter approval.

Federal appeals court

Eighth CircuitAppeal pending.

Who regulates

Missouri Gaming Commission; Missouri Attorney General

Laws and bills

None specific to prediction markets

Using Polymarket US in Missouri

Minimum age

18

Identity checks

Polymarket US requires date of birth, a phone number confirmed by text code, legal name, residential address and Social Security number. Most users are verified automatically; others may be asked for a government-issued ID and a selfie check. KYC must be completed before depositing or trading, and the terms require KYC, AML and sanctions screening. Source

Other platforms in Missouri

• KalshiNo restriction found
• Polymarket USNo restriction found
• Gemini PredictionsNo restriction found
• RobinhoodNo restriction found
• Crypto.comNo restriction found
• CoinbaseNo restriction found
• WebullNo restriction found
• DraftKings PredictionsSports blocked
• FanDuel PredictsSports blocked
• UnderdogOffered
• PrizePicksSports blocked
• Fanatics MarketsNot offered

Questions people ask

Is Polymarket US legal in Missouri?

Polymarket US does not publish a list of states where it is unavailable, and we found no court order, regulator action or Polymarket US notice that stops it from serving Missouri as of Oct. 22, 2026. Missouri has one public action on record that names Polymarket US. The latest (cease-and-desist, Sept. 16, 2026): The attorney general demanded each operator stop offering sports contracts to people in Missouri, or obtain a Gaming Commission license, pay the 10% wagering tax and fees, and bar under-21 users, within 30 days; the letters were announced Sept. 18, 2026. This summarises public actions; it is not legal advice.

Has Missouri sued Polymarket US or ordered it to stop?

Yes. Sept. 16, 2026: The attorney general demanded each operator stop offering sports contracts to people in Missouri, or obtain a Gaming Commission license, pay the 10% wagering tax and fees, and bar under-21 users, within 30 days; the letters were announced Sept. 18, 2026.

How old do you have to be to use Polymarket US in Missouri?

18. That is Polymarket US's minimum age, and it lists no different rule for Missouri.

Is sports betting legal in Missouri?

Legal online. Retail and mobile sports betting; the market launched Dec. 1, 2025 after 2024 voter approval.

Which court will decide whether Missouri can regulate Polymarket US?

Federal appeals from Missouri go to the Eighth Circuit, where an appeal on the question is pending. 3 petitions now ask the U.S. Supreme Court to settle the question nationally.

Sources

1. Polymarket App Terms & Conditions (ISV Front End), effective October 22, 2026 (embedded at polymarket.us/tos)
2. Missouri Attorney General letter to KalshiEX LLC
3. Missouri sports betting status