---
title: "Board Session"
method: POST
path: "/modules/instances/{instance_id}/board-session"
---

# Board Session

`POST /modules/instances/{instance_id}/board-session`

## Request

- Base URL: `https://api-docs.session-exchange.com` (the document declares no server; this is the origin it was published from)
- URL: `https://api-docs.session-exchange.com/modules/instances/{instance_id}/board-session`
- Auth: none declared

Start a board sign-in for a signed-in owner. Only when the instance's operator advertises
`endpoints.board_login` (the engine-side half, contract § 7): a single-use 60 s code in the URL
FRAGMENT (never sent in a request line, so never in a server log), which the board's gateway
exchanges server-side at POST /modules/world-sim/board/exchange and turns into its own cookie.

## Path parameters

- `instance_id` string, required

## Response `200`

Successful Response

- unknown

## Other responses

- `422`: Validation Error

---

[API](https://skmtc.dev/session-exchange/apis/a4sx.md) · [All operations](https://skmtc.dev/session-exchange/apis/a4sx/llms.txt) · [OpenAPI document](https://skmtc.dev/session-exchange/apis/a4sx/revisions/abaefc33dfc7?raw)