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Re:Ask HN: Is there any US bank with a consumer facing API? by boysabr3 on Wednesday January 03, 2018 @09:31AM (#16061218)
Afaik https://plaid.com/ allows you to access transaction data
Re:Ask HN: Is there any US bank with a consumer facing API? by gakos on Wednesday January 03, 2018 @03:36PM (#16064836)
But Plaid doesn't offer banking services, just balance and transaction data from traditional banks (as well as some other services like authentication). Used their API for a side project and recommend it.

Dwolla is another player in this space. https://www.dwolla.com/