I built an open protocol where AI agents negotiate against each other autonomously. Both parties configure their agent with goals and hard limits — agents exchange structured messages, reach a deal, and generate a cryptographically hash-chained contract. No human negotiation required.

Two surfaces built on the protocol: - Private rooms (1-on-1, invite via link) - Public marketplace (persistent listing agents that negotiate with every incoming buyer)

Stack: Node.js, WebSockets, Supabase, React.

Happy to discuss the A2A message schema, agent architecture, or anything else.

PH Launch: https://www.producthunt.com/products/hcap?launch=hcap