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

# Authentication

> How to authenticate requests to the SignalArk API.

The SignalArk API supports two modes of authentication depending on your use case.

## 1. API Keys (Server-to-Server)

For automated scripts, integrations, and external ingestion partners, use API Keys.

API Keys in SignalArk always begin with the `sak_` prefix.

### Managing API Keys

1. Go to **Settings > Security > API Keys**.
2. Click **Generate New Key**.
3. Assign the appropriate scopes (e.g., `signals:write`).
4. Copy the key securely; you will not be able to see it again.

### Using API Keys

Include the key in the `Authorization` header of your HTTP requests: