# Authentication

All requests to **`/data/*`**, **`/metric/*`**, **`/screener/*`**, **`/ownership/*`**, **`/events/*`** and **`GET /billing/balance`** require:

| Header | Value |
|--------|--------|
| `X-API-Key` | Your API key (create and manage keys in the product dashboard after sign-in). |

For `POST` requests with a JSON body, also send:

| Header | Value |
|--------|--------|
| `Content-Type` | `application/json` |