earonesty/qpayd

qpayd is a small server program, written in Rust, that lets a merchant accept Bitcoin payments on their own infrastructure. Instead of paying a payment processor, you run qpayd on your own machine; it creates invoices, locks the fiat price (for example 10 US dollars) to the equivalent Bitcoin amount using a configured price feed, watches the blockchain for the payment, and tracks whether the invoice was paid, expired, or refunded. When something happens, it can call a URL on your website (a webhook) so your shopping cart can mark the order as paid. The daemon supports both regular on-chain Bitcoin payments and Lightning Network payments. For on-chain it uses watch-only wallet descriptors, with Electrum as a fallback or rotation source so it does not need its own full node. For Lightning it can talk to Phoenixd or barkd as the backend. Invoices and state can be stored in SQLite for small setups or Postgres for bigger ones. The README also lists features like multiple stores, public payment links, signed webhooks with retry and replay protection, refund tracking, and an optional browser admin portal. Installation is either through Cargo (cargo install --path .) or by building a Docker image with the provided Dockerfile and running the container on port 8080 with a mounted config file and a data volume. Configuration is done in a TOML file based on qpayd.example.toml, and there are subcommands for one-time checks, database migrations, syncing, and sweeping. The README shows a minimal HTTP API: a POST to /v1/stores/main/invoices with a Bearer token creates an invoice, and a GET on the same path reads its current state. There are also two JavaScript packages, @qpayd/checkout for the customer-facing payment popup and @qpayd/admin for a merchant admin panel. The project is MIT licensed and has 1 star.