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

# Authentication

> Send your API key as a Bearer token, keep it on your server, and revoke it in Settings when you no longer need it.

Send your key in the `Authorization` header of every request:

```http theme={null}
Authorization: Bearer sk_morse_...
```

Every key starts with `sk_morse_` and ends with a short checksum, so a secret scanner can recognize a leaked key. A request with no key, a key Morse doesn't know, a revoked key, or a token that starts with `sk_` but isn't a whole Morse key gets `401` with the code `invalid_api_key`.

## Keep your key on a server

Anyone with your key can spend your credits, so treat it as a password. Morse stores only a hash of the key and shows the key once, when you create it.

Call the API from your own server. The API sends cross-origin (CORS) headers only to the Morse app, so a browser blocks calls from a page on another site. Don't put a key in code that ships to a browser or a mobile app.

## Manage your keys

Manage keys in the Morse app, under **Settings** > **API keys**. An account can have up to 25 active keys.

Each key shows when it last paid for a request. A request that Morse refuses before it bills anything doesn't count, whether for its body, its model, your balance, or a rate limit. `GET /v1/models` doesn't count either, because it's free. The time updates at most once a minute.

To revoke a key, click **Revoke** next to it, then **Revoke key**. Morse refuses the key's requests from then on. You can't undo a revoke.

## What a key can't do

A key calls the endpoints in the API reference: chat completions, image generation, web search, page fetch, and the model list. It can't manage your account. The endpoints for your balance, usage, keys, and purchases answer a key with `401` and the code `login_required`. Check your balance in the Morse app.


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