Des Moines-based digital payments company Dwolla Inc. has raised an additional $9.7 million in funding led by a new strategic investor, TechCrunch reported. The lead investor, CME Group, is a publicly traded company formed in 2007 with the merger of the Chicago Mercantile Exchange and the Chicago Board of Trade. "CME Group's timely investment in Dwolla recognizes the exponential impact that a modernized payment system can have on an economy and its participants," Dwolla founder Ben Milne said in a statement. Mark Fields, managing director of CME's strategic investments operations, will join Dwolla's board as part of the investment. Existing Dwolla investors Andreessen Horowitz, Union Square Ventures and Village Ventures also participated in this funding round, TechCrunch said. Dwolla previously raised $16.5 million in a funding round in April 2013.