eIDAS
eIDAS is the EU regulation governing electronic identification and trust services — including the qualified website (QWAC) and seal (QSEAL) certificates that identify regulated third parties in open banking. It provides the pan-European identity and certificate framework that PSD2's access-to-account model relies on, so a bank can cryptographically verify which licensed provider is calling its APIs.
Countries
Where this binds. Each links to the providers apis.io has catalogued there.
Industries
Each links to that industry as a scored cohort — so the question "how ready is this sector for the regime that governs it?" becomes one you can actually look at.
Implemented by these standards
A regulation is the law; a standard is the machine-readable contract that satisfies it. Almost every regime in this catalog restricts an interface rather than requiring one — where a standard exists, it is the part a provider can actually publish.