Panelizer and page_manager

It does support Panelizer. There is no default end point but it shouldn't be too hard to write one. All you need to do is extend RestfulPanelsPanelizer and create an endpoint with that.

It also supports page manager but only with a display id. Again, it shouldn't be too hard to write an endpoint controller (extending RestfulPanelsDataProviderDisplay) that takes a URL and passes in the display id to the parent class.