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

# Authentication

All endpoints use **HTTP Basic Authentication**. Your Client ID is the username and your Secret is the password.

```bash theme={null}
curl https://api.grainfinance.co/v1/... \
  -u "{clientId}:{secret}"
```

You can find your credentials in the [Grain Dashboard](https://console.grainfinance.co/keys) under **Developer → API Keys**. Each environment (Sandbox and Live) has separate credentials.