This guide explains how to use the **API diagnostics** add-on to monitor
Merchant API usage.

With API diagnostics, you can do the following:

- Monitor the usage of your API calls.
- Track the success and failure metrics of API calls.
- View the exact errors that caused API requests to fail.

It provides insights into the usage metrics, helping you understand how your
calls are performing.

> [!NOTE]
> **Note:** API diagnostics displays metrics for both Content API and Merchant API. You will see a consolidated view if you use both APIs.

## How to monitor usage statistics

To track the usage metrics in Merchant Center, do the following:

1. Go to [Merchant Center](https://merchants.google.com).

2. Select the settings icon . A
   menu appears.

3. From the menu, click **Add-ons**.

4. To enable the **API diagnostics** add-on, click **Add**.

5. A dialog appears, click **Add**.

6. Click **Your add-ons**.

7. Click **Go to API diagnostics**.

8. The [API diagnostics page](https://merchants.google.com/mc/contentapi/diagnostics)
   appears, where you can track usage metrics.

For more information, see [Debug API errors with API diagnostics](https://support.google.com/merchants/answer/14175321).