ios - How to track price changes on iPhone or iPad apps or retrieve app data like App Annie? -

ios - How to track price changes on iPhone or iPad apps or retrieve app data like App Annie? -

is there api can index cost changes iphone or ipad apps?

for instance, how this company, this company, , app annie collect ios cost data?

is scraping itunes option?

have tried apple affiliates api , search api .. poll server straight within application using afnetworking , there simple json request parses feed give accessible dictionary. or pre poll using php (or other language use) trim excess results , display need.

ios iphone ipad app-store