Origin IDs for many shipping addresses using the API

Hi - We're using the API. Is there a way to get an Origin ID for each of the additional addresses added? Is there a way to create more shipping addresses and their origin ID using the API, as well?

Is there any max limit to the number of addresses?

For now, our primary goal would be a way to get an Origin ID for each seller. We are a marketplace platform, so we will have many sellers shipping from many origin addresses.