How to display USD and Bitcoin price on Classified ads? Hello i'm developing this website https://buysellcarwithbitcoin.com/ how can i display the USD price of classified ads also converted in Bitcoin ? thanks!
If you want that cars could be paid by Bitcoin you need some payment gateway. 

Otherwise, if you want just to display prices in Bitcoin you can use some blockchain.info API to get the price for it. 
For example, this URL will return you how much is 5000 BTC:  https://blockchain.info/tobtc?currency=USD&amp;value=5000