The Trump family’s crypto venture has generated more wealth since the election—some $4.5 billion—than any other part of the president’s business empire. A major reason for the success is a partnership with an under-the-radar trading platform quietly administered by Binance, the world’s largest crypto exchange, whose founder is seeking a pardon from President Trump, according to people familiar with the matter. The online trading platform, PancakeSwap, serves as an incubator of sorts, drumming up interest among traders to use coins issued by the Trump family’s main crypto company, World Liberty Financial. The more World Liberty’s flagship coin, USD1, is used,...