//-- Intent: verifies a contact with the given EntityGuid exists on list with listcode of 123456 --// $.ajax({ type: "GET", headers: {"SwiftAPI-Key": "12345"}, contentType: "application/json; charset=utf-8", url: "http://api.v4.swiftreach.com/api/ContactLists/Contacts/Exists/123456/736c8340-e23b-4c23-aaa1-f55cfdb391bb", dataType: "json" success: function(result) { // Do something with the result } }); <!-- example return value --> true