BTCPay Server Open-source, self-hosted Bitcoin payment processor. The dominant non-custodial alternative to Stripe/PayPal for BTC. Repo: (.NET / C#). Architecture - BTCPay Server (.NET app) — main server. - NBXplorer — wallet management, indexes via Bitcoin Core. - Bitcoin Core + optional Electrs / Esplora . - LND / CLN / Eclair — Lightning node. - Postgres for state. Features - Stores (separate merchant accounts). - Invoices with checkout UI. - PoS (Point of Sale) terminal. - Apps : crowdfund, paywall, gift cards. - Plugins : Litecoin, Liquid, Monero, etc. - Webhooks : notify your app on pay…