In most cases, you create a project by adding an API so that you can work with it later. However, you can also create an empty project and add an API to the existing project.
Creating Project From REST URL
Swagger/OpenAPI Definition (REST)
GraphQL Schema
WADL Definition (REST)
WSDL Definition (REST)
Discovering APIs
Creating Empty Project
Project ManagementReadyAPI Documentation
Swagger/OpenAPI Definition (REST)