---
title: "Authentication and keys"
description: "Use bearer keys on your backend and rotate them without an interruption."
generated: true
---

# Authentication and keys

Send your key in the `Authorization` header:

```
Authorization: Bearer fv_live_...
```

A key is shown once, when it is made. Keep it on your server; do not put it in a web page or an app, where anyone could read it. Lost keys are revoked and replaced, not recovered.

Test keys start `fv_test_` and call the same API for free, with a daily allowance per account ([see limits](/start/limits)). Make keys in the developer console at https://play.fellowverse.app/developers; every account starts with free test keys. Rolling a key makes its replacement and lets the old key keep working for up to a week, so you can switch over without a gap.

:::warning
Never ship a Fellowverse API key in browser JavaScript or a mobile app. Use your own backend. See the [server relay guide](/guides/server-relay).
:::