title: Real life trading API
body: <p>Do you know an API that lets you trade with real life stock or currency?</p>
  
  <p>If so, please describe your experience:</p>
  
  <ul>
  <li>ease of development</li>
  <li>commissions</li>
  <li>sandbox environment?</li>
  <li>etc.</li>
  </ul>