Attorney General Catherine Hanaway says the companies must obtain gaming licences, meet age controls and pay state taxes or face enforcement.
The city says the prediction-market operators disguised sports bets as event contracts and skirted Maryland licensing rules.
The deal gives registered U.S. users live tennis, official data and prediction markets in one app.
HB 2711 adds age limits, anti-manipulation rules and steep penalties as the state gaming board tells federal regulators the products are illegal sports wagering.
The monitor also tracked prediction markets for the first time, while FIFA said it found no suspicious betting activity.
Kalshi broke records as H2 Gambling Capital said the category reached 27% of legal U.S. sports-betting volume
Senators say simulated trades, fake websites and paid creators may have been used to push prediction markets to U.S. users.
The tournament has driven record trading even as states and regulators intensify the fight over prediction markets.
Lawmakers sent the package to Gov. Josh Stein with a gambling-loss deduction, new university revenue rules and a tax aimed at CFTC-licensed platforms.
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