Edit in JSFiddle

$.ajax({
  url: "https://locahost:3000/api1",
  complete: function(data){
    $("body").append("<h4>api 1 is now complete</h4>");
    $.ajax({
        url: "https://locahost:3000/api2?x="+data.value,
        complete: function(data){
          $("body").append("<h4>api2 is now complete</h4>");  
          $.ajax({
            url: "https://locahost:3000/api3?x="+data.value,
            complete: function(data){
                $("body").append("<h4>api3 is now complete</h4>");
            }
          });  
        }
      });      
  }
});