it looks like the property is not available by querying /_api/Web/Lists but only by querying _api/Web/Lists/SchemaXml then parsing the xml
var url = __site + "/_api/Web/Lists(@v0)/SchemaXml?&@v0=guid%27"+listId+"%27";
$.ajax({
headers:{
Accept:"application/json;odata=verbose"
},
url:url,
success:function(res){
var xmlStr = res.d.SchemaXml;
var doc = new window.DOMParser().parseFromString(xmlStr, "text/xml");
var xPathRes = document.evaluate ('//@MaxItemsPerThrottledOperation', doc, null, XPathResult.FIRST_ORDERED_NODE_TYPE, null);
if (xPathRes.singleNodeValue) {
success(xPathRes.singleNodeValue.textContent);
}
},
error:error
});
or simpler by querying
/_api/Site/MaxItemsPerThrottledOperation
(thanks ghangas for this one (as found on REST API : different properties list using /_api/Web/Lists/SchemaXml VS /_api/Web/Lists/?))
So it looks like this limit is a property of the site and not per list.
Of course this property is not listed at https://msdn.microsoft.com/fr-fr/library/microsoft.sharepoint.spsite_members.aspx
Why KISS when you can go the MS way?