MiCA
MiCA is the EU regulation that brings crypto-asset issuance and services inside a single authorisation regime. It covers asset-referenced tokens and e-money tokens — the stablecoins — with reserve, redemption and disclosure obligations, and it licenses crypto-asset service providers: exchanges, custodians, brokers, portfolio managers and advice. It is the first comprehensive crypto framework in a major jurisdiction, and its practical effect on API operations is indirect but substantial: authorisation brings supervision, supervision brings change control, incident reporting and evidence, and those are the published-artifact facets this market scores lowest on.
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.