BTCPay Server

BTCPay Server is a free, self-hosted, open-source cryptocurrency payment processor that allows merchants to accept Bitcoin without fees or intermediaries. It is a fully featured invoicing and accounting system with Bitcoin wallet capabilities including full node support for on-chain, Lightning Network (LND, Core Lightning, Eclair), and Liquid Network. Self-hosting means no subscriptions, no transaction fees, and no third-party involvement, providing censorship-resistance and complete control over private keys with hardware wallet integration. Features include Point-of-Sale apps, tipping buttons, payment links, crowdfunding campaigns, and integrations with WooCommerce, Drupal, and Magento. Over one million downloads from GitHub as of 2025.