Monzo, the UK mobile-only bank, also has an API: https://developers.monzo.com/
Teller is not a bank itself though. I believe it started as a wrapper around banks' private APIs, not sure whether that's still the case.
Teller is not a bank itself though. I believe it started as a wrapper around banks' private APIs, not sure whether that's still the case.
That might change later this year when they roll out current accounts but for now it's just simple prepaid/travel debit card with mobile app.
Also not sure they have switched from WireCard yet? Last time I heard they have not switched all of their existing users to their own platform but perhaps they managed the transition already?