The top-level URL in an APIs.json file contains a fully qualified link to where the APIs.json file is published. This URL serves as a reference for the API collection and can also be validated. When an APIs.json file includes URLs to various properties, it can be verified against the top-level domain, ensuring the creation of an authoritative APIs.json artifact.
APIs.json Url Info
Message: There is a URL.
Policies
URL for APIs.json Contracts
Every API contract needs a valid URL that points back to its source of truth. This is how you make a contract authoritative and verifiable, not just a copy floating around somewhere.