CMA Open Banking Order
The UK Competition and Markets Authority's Retail Banking Market Investigation Order 2017 is the competition remedy that created UK Open Banking. It required the nine largest UK banks (the CMA9) to adopt and maintain a common, open API standard and funded the Open Banking Implementation Entity (OBIE) to write the specification, run conformance, and operate a directory — the delivery machinery that made the UK the reference open-banking regime.
Countries
Where this binds. Each links to the providers apis.io has catalogued there.
Regions
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.