Contract For Difference
They are not permitted in the United States, due to restrictions by the U.S. Securities and Exchange Commission onover-the-counter (OTC) financial instruments..
CFDs, when offered by providers under the market maker model, have been compared to the bets sold by bucket shops, which flourished in the United States at the turn of the 20th century. These allowed speculators to place highly leveraged bets on stocks generally not backed or hedged by actual trades on an exchange, so the speculator was in effect betting against the house. Bucket shops, colorfully described in Jesse Livermore's semi-autobiographical "Reminiscences of a Stock Operator", are illegal in the United States according to criminal as well as securities law.