CME Group Inc. and Cboe Global Markets Inc. are poised to offer bitcoin futures contracts, easing the way for mainstream investors to bet big while dragging regulators into a realm skeptics call a fad and fraud.

CME, the world's biggest exchange owner, and smaller venue Cboe, known for its VIX volatility products, were allowed to offer the products after pledging to U.S. regulators that they comply with the law. CME said its contract will begin trading Dec. 18. Cantor Exchange, a subsidiary of Cantor Fitzgerald, also will offer bitcoin binary options.

Bitcoin extended gains following the announcement.