I'm using meteor application and Untill now I'm making api calls like below

  
         var urlString = "http://api.stackexchange.com/2.2/users/"+surl;
         HTTP.call("GET", urlString,{params:{site:"stackoverflow"}},function(error,result)
                {
                     console.log(result.data);
                   });

At present iam getting a quota with pings 300 only.But i want more than 300.To get more than 300 and i have a application key how to request the api with key so i can get 10,000 pings per day.

Thanks