The primary data entity for released products is EcoResReleasedProductV2Entity. It's Public Collection Name is ReleasedProductsV2, therefore the OData URL is /data/ReleasedProductsV2. You can then filter it by ItemNumber and get ProductType, if that's what you're after.
Here is a documentation page about OData services for F&O.
By the way, OData is a RESTful API.