NOWPayments is a cryptocurrency payment processing service that enables merchants to accept payments in multiple cryptocurrencies, including Bitcoin, Ethereum, Litecoin, and many others. It offers a simple and secure way for merchants to accept payments online and is designed to be easily integrated into a variety of online platforms, such as e-commerce stores, ticketing websites, and more. NOWPayments also provides tools for merchants to track and manage their transactions, as well as options for setting up automatic conversion to a preferred fiat currency.