NOWPayments is described as 'Start accepting Bitcoin, Litecoin, Ethereum, stablecoins, and many more cryptocurrencies with native integration into your platform or a neat widget' and is a Payment Gateway in the business & commerce category. There are more than 25 alternatives to NOWPayments for a variety of platforms, including Web-based, SaaS, Android, iPhone and Self-Hosted apps. The best NOWPayments alternative is be-BOP, which is both free and Open Source. Other great apps like NOWPayments are BTCPay Server, CoinGate, Plisio and Swiss Bitcoin Pay.