Credit union atlantic. The possibility of you being able to profitably support small regional credit unions is pretty much 0. Maybe with a general browser use AI and an SMS portal. Also you'd need to bypass anti-bot protections, maybe solve captchas.

In my opinion that is the thing holding back almost all of these accounting products that make consumers lives better. I've solved it because all my cards and bills happen to support email, so I can use that as my source of truth for all my credit cards.