# X-EGO · Planetary ID

> Proof that a specific human approved a specific action, with a receipt anyone
> can check. No email, no password, no personal data — the approval is bound to
> the exact call the agent is about to make, so the receipt says what was
> approved, not just that someone was present.

X-EGO is infrastructure for AI agents. An agent asks a human to approve the
action it is about to take; the human approves it on a page that shows the call
field by field; the agent receives a receipt it can verify, and so can any third
party. Identities are pairwise — the same human looks like a different subject
to every audience.

## Interfaces

- [MCP server](https://mcp.x-ego.com): four tools — request a proof URL, verify
  presence, verify an approved action, check whether this human was seen before
  by this audience.
- [HTTP API](https://api.x-ego.com): `/verify-proof` and `/verify-action`,
  priced per call, payable over x402.
- [Docs](https://x-ego.com/docs.html): the interface, the receipt format, and
  what each field means.
- [Verification keys](https://api.x-ego.com/.well-known/jwks.json): public, so
  verifying a receipt costs nothing.

## For humans

- [Planetary ID](https://x-ego.com/enroll.html): a one-time EUR 3 registration.
  The fee is the cost of holding many identities at once: at most three per
  payment card.
- [Privacy](https://x-ego.com/privacy.html): what is stored and what is not.

## Notes for agents

- Without a Planetary ID, verification returns `valid:false` with code
  `planetary_id_required` and a registration URL. That is not a malformed
  request — send the human there.
- Prefer approving the actual call over approving a sentence. A sentence seals
  what the human read, not what then runs.
- Verify against parameters you parsed yourself, never against what another
  party says the call is.