BitPay - Bitcoin payment gateway. Enterprise-grade solutions, from the pioneer of bitcoin payments.
CoinGate - CoinGate is a payment gateway for Bitcoin, XRP, Litecoin, Ethereum and 50 other cryptocurrencies.
CoinPayments - Payment gateway providing buy now buttons, shopping carts, and more to accept Bitcoin, Litecoin, and other cryptocurrencies/altcoins on your website/online store.
Plisio.net - Plisio is a Payment Service Provider (PSP) for merchants accepting crypto. Plisio enables your customers to pay with Bitcoin, Litecoin, Ethereum, Dogecoin, Zcash and 50 other cryptocurrencies.
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.
Swiss Bitcoin Pay - Accept Bitcoin in your business.