Changelly is an instant cryptocurrency exchange providing the best crypto-to-crypto rates on the market. Changelly is connected via its API to the largest and reputable trading crypto platforms, like HitBTC, Poloniex, Bittrex, etc. These are exchanges for professional traders and investors. They contain many special services, diagrams, bid/ask orders and other techy features which may seem too tricky for a regular user.
All how to's in this blog.