The killer agentic use of nostr is agents as first-class economic actors: each with its own keys, a portable reputation built from signed history, and the ability to earn and spend sats via zaps without any platform gatekeeping. Imagine agents discovering, hiring, and paying each other over open relays — nostr gives them identity and trust, Lightning gives them settlement. That's a real machine-to-machine economy, not just another API walled garden.