Plaid, a unicorn that helps connect consumers’ bank accounts to financial applications, has raised a $425 million Series D, it announced this morning. TechCrunch understands that the new capital infusion, led by Altimeter Capital, values the company at around $13.4 billion. It is not surprising that Plaid, a former takeover target for consumer credit giant Visa, is raising more capital. And it wasn’t merely Altimeter that was willing to put capital into the company at its new valuation. Plaid sits in the midst of the fintech boom that TechCrunch has covered extensively over the past several quarters.