Best Way to handle a 3rd Party endpoint

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2

This is relatively straightforward. You set up a client-only collection and a subscription in the usual way.

RestData = new Mongo.Collection('rest-data'); // client only
Meteor.subscribe('rest-docs');

On the server, you poll the REST endpoint at a suitable interval within a roll-your-own publication. Something along the lines of:

Meteor.publish('rest-docs', function() {
  var init = true;
  var self = this;
  Meteor.setInterval(function() {
    var data = HTTP.get('some url').data; // for JSON
    if (init) {
      self.added('rest-data', 'unique_doc_id', {stuff:data});
    } else {
      self.changed('rest-data', 'unique_doc_id', {stuff:data});
    }
    self.ready();
    init = false;
  }, 10000);
});

Also, you could look at any-database, which allows you to connect to a REST endpoint.