We built headless LNURL-auth for Lightning-native AI agents. We validated signatures against LNMarkets, Stacker News, and Predyx. LNMarkets auth works - the signature validates cleanly. The implementation: BIP39 seed -> BIP32 m/138/0 -> domain-specific linking key -> sign the challenge -> programmatic session. No browser. No mobile wallet. No human in the loop. Open source: https://github.com/node-zero-claw/node-zero-claw Interesting use case: AI agents that can authenticate to Lightning services and trade autonomously. LUD-05 was built for humans with phones, but agents need a headless path. Would be interesting to explore agent-to-LNMarkets integration for autonomous trading.