Are you familiar with the REST maturity model (Richardson Maturity Model)?

The REST Maturity Model (Richardson Maturity Model) is a way to assess how well an API conforms to REST principles. It consists of 4 levels:

• Level 0 (Initial): The API uses a single URL and a single HTTP method (usually POST), without utilizing resources and standard HTTP methods.
• Level 1 (Resources): The API starts using different URLs for different resources, but may still use only one HTTP method.
• Level 2 (HTTP Methods): The API uses standard HTTP methods (GET, POST, PUT, DELETE, etc.) for resource operations.
• Level 3 (HATEOAS): The API provides hypermedia links (Hypermedia as the Engine of Application State), allowing clients to dynamically navigate through application states.

The higher the level, the more RESTful the API is considered. In practice, most APIs reach level 2, and level 3 is less common due to implementation complexity.