This story was originally published on Payments Dive. To receive daily news and insights, subscribe to our free daily Payments Dive newsletter. Dive Brief: Fiserv is acquiring StoneCastle Cash Management, a cash management firm that provides banks liquidity, and will leverage the firm’s platform to bolster its FIUSD stablecoin, the payments giant said Monday in a press release. Fiserv said the StoneCastle acquisition will allow it to become “a technology-enabled source of billions of dollars of institut ...