Thanks Kelly Gerrow for the feedback, and sorry for the late reply (I didn't see it...).
Well, I'd simply like to list all the tiles that I have in my AGOL, but I could not do it so far because I only see a sort of "limited part of the entire list".
Just to be precise, my request is in the form:
http://tiles.arcgis.com/tiles/<SERVER_CODE>/arcgis/rest/services?f=json&pretty=true&token=<MY_TOKEN>
The response I get is a JSON containing information of the tile services in my AGOL (along with "server", "id", "serviceItemId", "name", "type", "url", "created", "cacheKey"), but the number of the list is always 100, but I have more in my AGOL.
I can confirm I have more by going in arcgis.com -> my_contents, choose "all personal content" and filter by "Layer" and "Tile Layer". Actually I have 185 tile layers at the moment.
If I try to enter the details page from AGOL of one of these which is not listed in the JSON response, I can access its REST page. From the same REST interface, if I come back one level to the "home" page (where all tile layers should be listed), I cannot see this same layer, and I can only see 100 (as in my JSON response).