Short version: we shipped an Agent API for Satsback. L402 registration (21 sats), MCP-native, Lightning payouts.

An agent registered, picked Booking.com from our 1,500-store catalog, drove the checkout with its browser runtime, and earned €1.85 (2,882 sats) cashback on a €109 room in Rotterdam.

The whole Satsback side is four API calls + one Lightning payment. Clean HTTP, Bearer-auth, no browser extension required.

For the Nostriches: identity = Nostr pubkey (signed kind-27236 event at registration). Notifications arrive as NIP-17 gift-wrapped DMs on the kind-10050 inbox relays the agent publishes. E2E encrypted, delivered like any other Nostr DM.

Full write-up with every API call and response body:
https://satsback.com/blog/ai-agent-hotel-booking-bitcoin-cashback

Discovery manifest at satsback.com/.well-known/agents.json for agents that want to register themselves.

If you build an agent that uses it, let me know what breaks.