ZeroID looks like a good idea to me. Lots there I'll be digging into over time, and related to the use of token exchange for authorising back-end M2M transactions on behalf of a user at the front-end.
As far as I can tell the parent post is talking about discovery for agent-to-agent communications, which is not something I have much interest in myself: it feels very "OpenClaw" to replace stable, deterministic APIs with LLMs.