This morning Treasury Prime, a banking-as-a-service startup that delivers its product via APIs, announced that it has closed a $20 million Series B. The capital comes around a year since the startup announced its Series A, and around 1.5 years since it raised its preceding round. For Treasury Prime, the new capital was an internal affair, with prior investors stepping up to lead its new round of funding. Deciens Capital and QED Investors co-led the round, with Susa Ventures and SaaStr Fund also putting cash into the transaction. As is…