Whatsapp online tracker api

I just want whatsapp online status tracking API or script. Let me know if You have idea about find API for it and you able to do it, you can use libraries like yowsup or any other but not whatsapp web. API should be simple input is a phone number with country code - output should be online offline status.
Also bid Your final amount for make application, so I can decide to contact You or not.
You must write Whatsapp Tracker in bid, else Your bid will be considered as Spam.