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The Ontologies API at ontologies.aiql.io serves the schema catalog. It stores and returns the shape of connected sources: classes, data properties, and object properties. It does not store row-level data. The catalog holds source types such as databases and APIs. Posting a source URL to a type introspects that source and builds a schema instance others can reuse. This API is the programmatic surface of the Ontologies product. Studio’s in-workspace ontology views apply a shape inside a workspace so Observatory can reason. The Ontologies API is the directory and introspection layer for those shapes. Related APIs: Middleware API, Connectors API.