Greece has several such open API endpoints for validating information, including VAT/company number, the equivalent of social security number, whether your personal tax returns have been processed, whether you were admitted to a state university, and so on.
For most of these services, all you need to access results is a subset of the relevant information. There is no requirement to register or authenticate, but they do seem to have crude forms of rate limiting in place.
For most of these services, all you need to access results is a subset of the relevant information. There is no requirement to register or authenticate, but they do seem to have crude forms of rate limiting in place.