Laravel Display USD Product mysql Price exchanged from Bitcoin

I have an liitle store with Products where all the Price are in Bitcoin also in Mysql Database in this formate:

 @else 

Now i want display the Bitcoin Price from database in USD live rate with Curl.

Whats the best method for it?

I have try it with this code,any other working ideas?:

<?php  
  $url = "http://ift.tt/19jUGsx";

  $json = file_get_contents($url);
  $data = json_decode($json, TRUE);

  $rate = $data[1]["rate"];    
  $usd_price = DB::table('products')->whereIn('category_id')     
  $bitcoin_price = round( $usd_price / $rate , 8 );
?>

<ul>
   <li>Price: <?=$usd_price ?> $ / <?=$bitcoin_price ?> BTC
</ul>

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