[depp]

<script src="//code.jquery.com/jquery-1.11.0.min.js"></script>
<script>
$.ajax({
      url: "http://emspost.ru/api/rest?method=ems.calculate&callback=jsonEMSApi&from=city--moskva&to=city--brjansk&weight=2",
      dataType: "jsonp",
      jsonp: 'jsonEMSApi'
});

function jsonEMSApi(data){
   alert(data.rsp.price);
}</script>