Coinbase - Bitcoin, safe and easy.
Bitit.io - Instant, easy and secure cryptocurrency purchases. Buy & sell the leading crypto assets with Bitit, the easiest, most secure platform for getting started.
Binance - Cryptocurrencies exchange platform
changelly - Exchange alternative cryptocurrencies.
Exodus.io - All-in-one app to secure, manage and exchange blockchain assets.
BitStamp - Provide reliable and easy to use service for companies and individuals to exchange bitcoins.