Unfortunately, there isn't a comprehensive list that I'm allowed to share, and even if there were we're often rolling out API access gradually because it can re

Unfortunately, there isn't a comprehensive list that I'm allowed to share, and even if there were we're often rolling out API access gradually because it can require implementation changes on the developer's side (for example, to support an OAuth redirect flow), so it's possible that right now a particular institution may be accessed via API in one Plaid integration but via screen-scraping in another. I think the only thing I can say here about specific institutions is that of the major US banks, Capital One, Chase, Wells Fargo, and US Bank have all issued press releases indicating that they have signed agreements with us to provide API based access.