curl -i 'http://developer.echonest.com/api/v4/artist/profile?api_key=FILDTEOIK2HBORODV&name=weezer'

HTTP/1.1 200 OK
Content-Length: 135
X-RateLimit-Limit: 120
X-RateLimit-Remaining: 62
X-RateLimit-Used: 58

string baseurl = "http://developer.echonest.com/api/v4/artist/profile?api_key=GM5C44WAJ08RK7HSF&name=weezer";
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(baseurl);
request.Method = "POST";
request.Accept = "application/json";
request.UserAgent = "curl/7.37.0";
request.ContentType = "application/x-www-form-urlencoded";

using (var streamWriter = new StreamWriter(request.GetRequestStream()))
{
    string data = "browser=Win7x64-C1|Chrome32|1024x768&url=http://www.google.com";
    streamWriter.Write(data);
}

var response = request.GetResponse();
string text;

using (var sr = new StreamReader(response.GetResponseStream()))
{
    text = sr.ReadToEnd();
    Console.WriteLine(text);
}