I read a lot of questions about this concern, and some of them are
So my question is if the top layer is REST API and there is no need for any UI, is REST api considered as a presentation layer or application layer?
Since I received some comments how this question has nothing to do with DDD and that there is no presentation layer in DDD etc, not to confuse application layer in OSI etc.., I decided to add this .
It appears that there is also an distributed interfaces layer that would actually handle this scope.
So basically presentation layer is a part of DDD architecture, just not the heart of this architecture. Also web services in a form of .net web api (rest) would exist in this distributed interfaces layer.