To come to know everything about What Bank Is Cash App On Plaid, you need to keep in mind that Plaid supports many banking institutions such as Chase, Wells Fargo and Bank of America. In addition to this, you can also link your credit unions or smaller banks to your Cash App account.
Firstly, Cash App is a fintech that offers services in partnership with banks. Cash App offers direct deposit account in partnership with either Lincoln Savings Bank or Sutton Bank. You can find the bank linked to your deposit account by opening Cash App-> Tap on Bank Icon (1st icon) on bottom menu-> Tap on Deposits & Transfer-> it will show the bank Routing number and account number associated with your Cash App account along with the bank name (if the bank name is not mentioned, just google on your routing number to find your Bank name)
Cash App also offers the Cash Card, in partnership with the banks (mostly Sutton Bank). So the default assumption is it will be either of these banks that you can use to link with Plaid.
But with Plaid, you can link your bank account (not the card) by using online banking credentials like user name and password, associated with this account.
Regards, J Wick