> ## Documentation Index
> Fetch the complete documentation index at: https://dash-docs.nomos.trade/llms.txt
> Use this file to discover all available pages before exploring further.

# Authentication

> Send your key as a bearer token on every request.

Every request, `/healthz` included, carries your key:

```bash theme={null}
Authorization: Bearer codex_...
```

A missing, unknown or revoked key answers **401**:

```json theme={null}
{ "error": "unknown or revoked API key" }
```

* **The key is yours alone.** Nomos sees every request it makes. If it leaks, tell Nomos: it can be revoked at once and replaced.
* **Server side only.** The API sends no CORS headers, so browsers cannot call it directly, and a key in browser code would be public anyway. Call it from a server, a script or a notebook.
* **One key, every route** in this reference.

<Note>
  The playground on each endpoint page sends your key through Mintlify's request proxy. To keep a key off third-party servers entirely, use cURL or your own code.
</Note>


This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.