All of you probably heard about bitcoin. This is the very first appeared crypto currency.
Since its inception, its value has increased thousands of times. Bitcoin's capitalization exceeds $ 1 billion.
Following bitcoin, several hundred other crypto-currencies appeared - Lightcoin, Efirium, Dogicoin, and others.
Not all of them also grew in price, but many of them are traded on crypto-exchange exchanges.
This allows you to earn on the purchase and sale of these currencies between exchanges and this is called arbitration.
You buy a currency on one exchange at a low price, send it to another exchange and sell it there, while your income is the difference in rates minus interest when sending crypto currency.
This application shows the difference in the rates of crypto currency, which it takes from the exchanger sites.