Today on Fintech Stacks, we break down a massive $5.6B commercial card shift as Brex powers Fifth Third’s corporate program, Coinbase deepens its banking ties by bringing bitcoin directly into PNC’s wealth platform, and Sezzle scores a major credibility boost with its inclusion in the S&P SmallCap 600. Three stories, one stack — and all signal how fintech keeps reshaping who gets access to money, credit, and crypto.