How to connect banks on cash advance apps with plaid? Besides, they will also suggest some additional support and guidance so that you can determine the right source of information. To use plaid, select “linked accounts” or “linked bank if you don’t have an account already linked, and instead of choosing your bank from the list, type. 2 brokerage services by cash app investing llc, subsidiary of block, inc., member finra/sipc.see our brokercheck.bitcoin services provided by block, inc. Cash app is a p2p tool that streamlines money transfer in mobile banking, stock investing, and bitcoin buying and selling.