Are there any feed services that would sell an individual (person or business) license? It seems like they all strive to be a backend for a SAAS.
Plaid offers transactions APIs (https://plaid.com/products/transactions/), but I guess to your point these APIs are geared towards fintech companies, not personal use.
EDIT: I don't know how well it works in general, though. You'd have to test it yourself.
[1] https://github.com/simplefin/simplefin.github.com/issues/14
There are some things that are “natural SaaS” and interoperability with ugly services run by huge banks that are probably moving targets and probably have administrative overhead to use is one example.