mcp
GET /.well-known/openai-apps-challenge
ChatGPT app-directory domain-verification token (plain text).
Authentication
This endpoint is public. It takes no credential and no organisation — it is what our own marketing site and AI answer engines read.
This endpoint takes no organisation id. Your key already identifies the organisation it belongs to, and the response is scoped to it.
Try it
Replace anything in angle brackets with your own values, and the key placeholder with a key from your dashboard.
curl -X GET https://api.zinndigital.com/.well-known/openai-apps-challengeSigned in? The API console in your dashboard fills in your real organisation id and your own key, and runs the request against the live API so you can see the actual response. Open this endpoint in the API console
Details
The token OpenAI's plugin portal asks the MCP host to serve before it connects the server for review (docs/925 §6): exactly the token as text/plain, never JSON. Public by design; set in Vault without a deploy. 404 while no token is set. Unauthenticated.
Errors this endpoint can return
404