Polymarket Halts New Michigan Sports Positions as State Restrictions Spread

Polymarket is preventing Michigan customers from opening new sports positions, adding another major platform to the state’s growing list of restricted prediction market offerings. Michigan already secured agreements or court orders restricting sports event contracts offered through Kalshi , Robinhood and Coinbase . The platforms reached that position through different legal paths, and those restrictions have not resolved the underlying dispute over whether the state can regulate federally registered event contracts as gambling. Customers received an email this week alerting them of Polymarket's recent move.