CME Group is rolling out a new kind of interest-rate futures contract, looking ahead of new regulations that will thrust privately negotiated contracts onto open platforms like exchanges.

Under the 2010 Dodd-Frank financial-overhaul law, a large chunk of the $650 trillion market for over-the-counter transactions known as "swaps" will have to be traded on transparent venues and be routed through central clearinghouses, which guarantee trades for a fee.