I'm connecting with Breeesharp successfully to WebApi already in production. The WebApi use camelcase approach, so I implement a model mismatch approach. The bug that I faced was at savechanges time when the metadata AutoIncrementKe's, property name is not converted back to pascal case which cause ArgumentOutOfRange because Breeze doesn't find the "id" property. Must be "Id". My workaround was force the autoincrementkey's property name into the method BeforeEntitySave.