In this episode, Calle introduces Numopay, an open-source Bitcoin payment terminal that enables tap-to-pay experiences similar to fiat systems. We explore its technical foundations, privacy features, future developments, and the broader ecosystem of Bitcoin payment solutions.

Takeaways:

🔸Numopay's open-source payment terminal

🔸Tap to pay Bitcoin using NFC and QR codes

🔸Privacy features of Cashu’s eCash system

🔸Auto withdrawal to Lightning addresses for security

🔸Future developments including BIP321 and integrations

Timestamps:

(00:00) - Intro

(00:38) - What is Numopay?

(03:29) - Numopay’s UX, tap-to-pay & offline NFC payments

(08:30) - Unified QR codes (BIP 321)

(10:21) - Auto withdrawal to lightning address

(13:51) - Evolution of Bitcoin payment infrastructure

(20:08) - What is the future of Numopay?

(22:47) - The Cashu ecosystem in 2026

(27:34) - Where should people be using Cashu systems today?

(30:48) - Privacy in Bitcoin

(34:34) - Future of Bitcoin development with AI

(42:06) - Closing thoughts

Links:

Stephan Livera links:

NumoPay: Tap-to-Pay Bitcoin with Calle | SLP728