ePrivacy Directive
The ePrivacy Directive governs privacy in electronic communications across the European Union, regulating the confidentiality of communications, traffic data, and — most relevantly for network APIs — location data. It sits alongside the GDPR as the sector-specific regime for communications providers, and generally requires consent before location or traffic data may be processed for value-added services.
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.