<?php $url = "https://btc-e.com/api/3/ticker/btc_usd"; $fileGet = file_get_contents($url); $json = json_decode($fileGet, TRUE); $json = $json["ticker"]["last"]; $premium = 5; //in percentage $premium = $premium / 100; $dollar_amount = $premium * $json; $customer_price = $json + $dollar_amount; echo $customer_price; ?> i was trying to display my own premiunm exchange rate. i mean (Buy Bitcoin on my site at $.....). i was doing this by using the last exchange rate from btc-e.com/api/btc_usd.which was a jason. what i did is that i define my own percentage from there last exchange rate and i add that percentage to it.but it doesn't work. above is example of my code let say im working with addition of 5 percent. please can i get a help ?