President Trump’s social media company has moved one step closer to transforming itself into a financial services firm that intends to market investment products, including crypto, to retail investors.

Trump Media & Technology Group, the parent company of Truth Social, which has become Mr. Trump’s main online megaphone, said on Tuesday that it had signed a binding agreement with a crypto trading platform and a newly created Florida investment firm to launch a series of exchange-traded funds, or E.T.F.s, by the end of the year.

The move to market E.T.F.s to investors is part of a strategy by Trump Media to generate a more reliable source of revenues after failing to attract sufficient advertising dollars to Truth Social.

In the deal, Trump Media will team up with Crypto.com, a digital asset trading platform with more than 140 million customers, and Yorkville America Digital, a company with ties to the founders of Yorkville Advisors, an investment firm based in Mountainside, N.J.

Davis Polk & Wardwell, a big New York law firm, will advise the parties in developing the investment products. Over the past month, Mr. Trump has been targeting some of the nation’s biggest law firms for failing to take on conservative clients, or for taking on clients with causes the president opposes.

“This agreement is a major step forward in diversifying TMTG into financial services and digital assets,” said Devin Nunes, Trump Media’s chief executive and a former California congressman.