http://charts.spotify.com/api/tracks/most_streamed/global/weekly/latest

API Documentation
Endpoints
Available objects - /api/
      ["tracks"]
    
Available metrics - /api/tracks/
      ["most_streamed", "most_viral"]
    
Available metrics - /api/tracks/most_streamed/
      ["ar","at","au","be","bg","ch","cl","co","cr","cz","de","dk","ec","ee","es","fi","fr","gb","gr","gt","hk","hu","ie","is","it","li","lt","lu","lv","mx","my","nl","no","nz","pe","pl","pt","se","sg","sk","sv","tr","tw","us","uy","global"]
    
Available time window types - /api/tracks/most_viral/global/
      ["daily", "weekly"]
    
Available dates - /api/tracks/most_streamed/global/daily/
      ["latest","2013-12-08","2013-12-01","2013-11-24","2013-11-17","2013-11-10","2013-11-03","2013-10-27","2013-10-20","2013-10-13","2013-10-06","2013-09-29","2013-09-22","2013-09-15","2013-09-08","2013-09-01","2013-08-25","2013-08-18","2013-08-11","2013-08-04","2013-07-28","2013-07-21","2013-07-14","2013-07-07","2013-06-30","2013-06-23","2013-06-16","2013-06-09","2013-06-02","2013-05-26","2013-05-19","2013-05-12","2013-05-05","2013-04-28"]
    
Track data - /api/tracks/most_streamed/global/daily/latest
      {
         "tracks":[
            {
               "date":"2013-12-15",
               "country":"global",
               "track_url":"https:\/\/play.spotify.com\/track\/7DyuZtvlGT0z5Xz8peiLN7",
               "track_name":"I See Fire",
               "artist_name":"Howard Shore",
               "artist_url":"https:\/\/play.spotify.com\/artist\/6eUKZXaKkcviH0Ku9w2n3V",
               "album_name":"The Hobbit: The Desolation of Smaug (Original Motion Picture Soundtrack)",
               "album_url":"https:\/\/play.spotify.com\/album\/5kqgALc3cz9P3VclmSmHfr",
               "artwork_url":"http:\/\/o.scdn.co\/300\/be7d523ea35aeb10f561712420d3429f0ec68eec",
               "num_streams":515608,
               "window_type": "daily"
            },
            {
               "date":"2013-12-15",
               "country":"global",
               "track_url":"https:\/\/play.spotify.com\/track\/44GgIVlmRsD1qMWONOWOS3",
               "track_name":"Waiting Game",
               "artist_name":"BANKS",
               "artist_url":"https:\/\/play.spotify.com\/artist\/2xe8IXgCTpwHE3eA9hTs4n",
               "album_name":"LONDON",
               "album_url":"https:\/\/play.spotify.com\/album\/4xG1FKMIQPGYRujVBtMAqm",
               "artwork_url":"http:\/\/o.scdn.co\/300\/4027ebaa3c0ff4161020cb37a546f25929249166",
               "num_streams":182325,
               "window_type": "daily"
            }
      }
    
Callbacks for JSONP
Append ?callback=foo to track data endpoints to use a JSONP callback:

      foo({"tracks":[{"date":"2013-12-15","country":"global","track_url":"https:\/\/play.spotify.com\/track\/7DyuZtvlGT0z5Xz8peiLN7","track_name":"I See Fire"...)
    
Legacy Endpoints
/api/charts/ redirects to /api/tracks/.

/api/charts/<metricType>/ redirects to /api/tracks/<metricType>/.

/api/charts/<metricType>/<country>/ redirects to /api/tracks/<metricType>/<country>/weekly/.

/api/charts/<metricType>/<country>/<date> redirects to /api/tracks/<metricType>/<country>/weekly/<date>.