MGCB says Polymarket will stop sports event contracts in Michigan by November 25, 2026

The Michigan Gaming Control Board (MGCB) has secured another stop on sports event contracts: Polymarket will cease offering them in Michigan by the end of the day on November 25, 2026. For high-risk payment teams, the point is simple — when a regulator gets court backing, the pressure moves quickly from “policy dispute” to “shut it down.”

1. The MGCB says this is part of a broader push against platforms it believes were operating in violation of Michigan gambling law. The regulator has already won a preliminary injunction against Kalshi, and that ruling has helped it continue pressing other operators.
2. Polymarket US tried to block Michigan from applying its gaming laws, but the company ultimately failed to win that argument and will comply with the outcome of several court decisions, including the Sixth Circuit decision that upheld the lower court’s ruling.
3. Michigan Attorney General Dana Nessel said: “One by one, from Kalshi to Robinhood and Coinbase, and this latest agreement with Polymarket, we’re holding the national sports betting industry accountable to Michigan law.” She added that the MGCB and her office are “protecting Michigan residents” by ensuring gaming in the state takes place in licensed and regulated ways.
4. Coinbase already agreed to stop offering its sports event contract and did so on October 10. Robinhood agreed earlier, on September 9, and closed its trading on sports event contracts on October 9.

For PSPs and acquiring teams, the practical takeaway is that sports event contracts can move from a product discussion to a legal and settlement-risk issue very fast once a state regulator starts winning in court. Michigan is now a live example of what that looks like.