According to Lightspark, stablecoin payments at the register will be interoperable across Spark wallets and run on Bitcoin rails, indicating a point-of-sale use case for BTC-backed settlement infrastructure, source: Lightspark on X, Dec 10 2025. The post emphasizes open networks and wallet interoperability but discloses no launch timeline, supported stablecoin issuers, fee model, or regional availability, source: Lightspark on X, Dec 10 2025. No pricing impact, partnership roster, or compliance specifics are provided, framing the update as a capability statement rather than a detailed rollout, source: Lightspark on X, Dec 10 2025. For trading focus, the communication centers on POS stablecoin settlement using Bitcoin rails, a theme to monitor for BTC network demand and stablecoin payment activity, source: Lightspark on X, Dec 10 2025.