title: Translate API User Rate Limit Exceeded [403] without reason
body: <p>I use google translate API with C# code via "Google.Apis.Translate.v2" version 1.9.2.410 with paid service. </p>
  
  <p>Code is some like:</p>
  
  <pre><code>var GoogleService = new Google.Apis.Translate.v2.TranslateService(
   new BaseClientService.Initializer
  {
      ApiKey = Context.ConfigData.GoogleApiKey,
      ApplicationName = "Translator"
  });
  ...
  
    var rqr = GoogleService.Translations.List(item, 'de');
    rqr.Source = "cs";
  
    var result = await rqr.ExecuteAsync();
  </code></pre>
  
  <p>This code take Exception:</p>
  
  <blockquote>
    <p>User Rate Limit Exceeded [403] Errors [   Message[User Rate Limit
    Exceeded] Location[ - ] Reason[userRateLimitExceeded]
    Domain[usageLimits] ]</p>
  </blockquote>
  
  <p>Before that, it never was. My limit it's:
  Total quota 
  50 000 000 characters/day
  Remaining<br>
  49 344 849 characters/day
  98,69 % of total
  Per-user limit<br>
  100 requests/second/user</p>
  
  <p>The number of requests is certainly less than 100 request per second
  Please what's wrong?</p>