> For the complete documentation index, see [llms.txt](https://docs.orda.network/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.orda.network/api-reference/api-reference/authentication/required-headers.md).

# Required Headers

| Header        | Description                                                          | Example         |
| ------------- | -------------------------------------------------------------------- | --------------- |
| `x-client-id` | Your project client ID from orda dashboard                           | `prj_abc123...` |
| `x-signature` | HMAC-SHA256 signature of the canonical request body                  | `a1b2c3d4...`   |
| `x-timestamp` | Request timestamp in milliseconds (for replay protection - Optional) | `1704067200000` |