Polymarket must close Michigan bets by 25 November

A federal court approved the Polymarket deal after Coinbase & Robinhood made similar agreements & Kalshi was hit with an injunction.

The hit

Polymarket US has agreed to stop offering new sports-related event contracts to Michigan residents & must close existing ones, under a deal approved by a federal court. The Michigan Gaming Control Board says none of Kalshi, Coinbase, Robinhood or Polymarket US hold a state licence to offer sports event contracts.

Why it matters

The Michigan Gaming Control Board is working with the state’s Attorney General to pursue platforms offering sports event contracts without authorisation. The Attorney General’s office secured a preliminary injunction against Kalshi. Coinbase & Robinhood struck separate agreements, & Polymarket US followed with a court-approved deal. The MGCB points residents to its list of licensed operators.

The record

Attorney General injunction	Preliminary injunction barring Kalshi from Michigan sports contracts, secured September 2026
Coinbase agreement	Agreed October 2026 to stop offering sports contracts, including Kalshi-traded ones, to Michigan customers
Robinhood agreement	Reached a similar agreement with Michigan regulators before Coinbase
Polymarket US deadline	Federal court-approved deal reached 28 October 2026 to close existing Michigan sports contracts by 25 November
Cease-&-desist letters	Hundreds sent to unlicensed online gambling operators (MGCB)

What happens next

Watch 25 November 2026, the deadline for Polymarket US to close existing Michigan sports contracts. Illegal Gambling Awareness Week runs to 13 November, with CheckBeforeYouPlay.org live for residents to check operator licensing.

Sources: Michigan regulator steps up campaign against illegal online gambling

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