Coinbase - Bitcoin, safe and easy.
CoinGate - CoinGate is a payment gateway for Bitcoin, XRP, Litecoin, Ethereum and 50 other cryptocurrencies.
Binance - Cryptocurrencies exchange platform
NOWPayments - NOWPayments is a crypto payment gateway that supports more than 300 cryptocurrencies, including fiat, and offers simple tools to accept crypto payments, like a crypto payments API, plugins, invoices.
Poloniex - US-based cryptocurrency exchange with maximum security
Kucoin - Find the Next #Crypto Gem on #KuCoin, the People's Exchange