title: Is there an API for ASIN to UPC?
body: <p>How are websites like <a href="http://asintoupc.com/" rel="nofollow">http://asintoupc.com/</a> able to scrape UPC so easily?</p>
  
  <p>Is there an open API available anywhere that i'm missing?  I'm a php developer, I haven't had much luck pulling from amazon API.  </p>
  
  <p>Thanks</p>