I need to develop site like this http://mcxprice.com/ i just want to know is http://mcxprice.com/ is using any API ? how can i use this type of API
yes but i need to develop same type of website so i need to know which API or which site they are fetching information?
#1 You don't need...but you would like #2 You will NEVER find out what kind of API they are using unless someone from the web site releases that information. Most likely they are fetching/scraping the info from other sources. #3 There ARE APIs available that will allow you access to that info if you use Google to search for them.
It will be difficult to know where they are getting the prices from as it is done by their server(s). This is as close as you will get: http://mcxprice.com/v.ashx
That's the wrong question to ask. The right question is "how do they do this?" The answer is not likely "scraping other websites", for that the updates of content are too frequent. You need a stream of market data for this, where you get that I don't know. After you get that stream of market data you need to model it into your own database for your site. And then you have a very smart ajax polling script (every second, it seems(!)) that gets the viewer only the data they need for any given page. This is not an easy website to code. I suggest you get a partner who *really* knows "realtime" code and databases.