To start using Blobr, you need at least one working REST API.
It does not matter whether you have Open API specs for that REST API. If you don’t, you can still manually add the endpoints.
Once you have connected your APIs, this means we are able to reach them. You can then start to create API Products out of them. Because we act as an API Proxy, we are able, according to the rules you’ve defined in your API Products, to give or restrict the access the end users.