Stephan Livera Podcast NumoPay: Tap-to-Pay Bitcoin with Calle | SLP728
Mar 10, 2026
A deep dive into Numopay, an open-source Android POS that enables NFC tap-to-pay and offline Bitcoin transfers. They explore unified QR/NFC payment payloads, Lightning integrations, and auto-withdraw workflows for merchant security. The conversation highlights Cashu eCash privacy features, real-world use cases, and a roadmap for making Bitcoin payments simple for everyday businesses.
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Tap To Pay Bitcoin With Cashu eCash
- Numopay enables tap-to-pay Bitcoin by transferring Cashu eCash over NFC, creating an instant, offline payment experience.
- Cashu eCash lives on the payer's device and can be sent directly via NFC to the POS without touching the internet, improving privacy.
Offer Unified Cashu And Lightning Payment Paths
- Offer both Cashu and Lightning payment options and use NFC to present the payment payload so wallets can pick the right rail.
- Numopay shows unified QR and NFC payloads and supports offline Cashu NFC transfers while auto-creating Lightning invoices for other wallets.
BIP321 Lets Wallets Choose The Best Payment Rail
- BIP321 unified payment payloads let one QR/NFC contain on-chain, Bolt11 and Cashu requests so wallets choose their preferred rail.
- NFC tolerates larger payloads, making unified QR data ideal for tap-to-pay.