To provide me with API access to my own accounts, Era goes through another third party provider which again connects to my bank. I guess they could eventually get direct connections themselves.
So instead of me get convenient read-only access to my bank, I've ended up giving two separate third party providers credentials I'd prefer they didn't have.
All I'd need was an automated way to get a CSV or JSON dump of my transactions and I'd have been happy, but none of my banks support that without manually logging in. It's infuriating.
AFAICT, psd2 should be sufficient to do the most elemental of banking features. See transactions and initiate them.
But that is quite limited.