---
title: "Post Passport Ephemeral"
method: POST
path: "/v1/auth/passport/ephemeral"
tags: ["passport-auth"]
---

# Post Passport Ephemeral

`POST /v1/auth/passport/ephemeral`

## Request

- Base URL: `https://api.lithtrix.ai` (the document declares no server; this is the origin it was published from)
- URL: `https://api.lithtrix.ai/v1/auth/passport/ephemeral`
- Auth: none declared

Issue a session-scoped ephemeral Ed25519 passport for stateless sandboxes.

Requires the agent **root** ``ltx_*`` Bearer or a valid passport challenge signature.
Swarm child issuance uses the authenticated spawn route instead of this handler.

## Headers

- `authorization` string, nullable

## Request body

- EphemeralRequest: Ephemeral passport — requires root API key or passport challenge signature.
  - `agent_id` string, required
  - `challenge_id` string, nullable
  - `signature` string, nullable: RFC4648 base64 raw Ed25519 signature over the challenge payload.

## Response `200`

Successful Response

- unknown

## Other responses

- `422`: Validation Error

---

[API](https://skmtc.dev/lithtrix/apis/lithtrix-api.md) · [All operations](https://skmtc.dev/lithtrix/apis/lithtrix-api/llms.txt) · [OpenAPI document](https://skmtc.dev/lithtrix/apis/lithtrix-api/revisions/be5de51bf4f8?raw)