Besides currency exchange rates, you can use this method to execute more advanced tasks that are perhaps too complicated to do by yourself, or are simply impossible to access unless you use the services provided by specialists, such as programmable Short Message Service (SMS) and voice services, web analytics and statistics generation, and online payment gateways. Most of these services are not free, but you can easily achieve those functions in minutes without even setting up the server infrastructure and backend system; it's definitely the cheapest and fastest way to get your product up and running without much hassle.