title: About Google App Engine Socket API
body: <p>I'm calling a URL to get json data from another web site in my Google App Engine application. Then i received bellow message.</p>
  
  <blockquote>
    <p>The Socket API will be enabled for this application once billing has
    been enabled in the admin console</p>
  </blockquote>
  
  <p>So i decided to enable billing. but i have some question.</p>
  
  <p>For <a href="https://developers.google.com/appengine/docs/quotas#Mail" rel="nofollow">Mail API</a>, we can send 100 messages per day for free. Like this are there any Free Default Limit for Socket API ?</p>
  
  <p>How much should i pay for using Socket API ?</p>
  
  <p>Should i pay per day or per minute ?</p>
  
  <p>Can anyone explain how to setting daily budget and etc when enabling billing on google app engine ?</p>