UMC will also create the support for SOAP and REST api, of course if you tell it to.
For the REST API you will find your entity in the ACL. System->Web Services->SOAP/XML-RPC roles.
You will have available certain method for CRUD in the SOAP API.
I've used SOAP-UI for the example above. Great tool for testing web services.
For the REST API you get a similar thing in the ACL. System->Web Servives->Rest Roles
and you can decide what attributes to display from System->Web Services->Rest attributes
Everything else should work as the REST API works for products.