The API Inspector (product docs) allows you to look under the hood and see what API calls the sync is running, which are succeeding, and which have had any issues. This is a powerful tool for debugging syncs on your customers behalf.

Today, you can use this in your Census workspace to debug any issues with syncs. This is an advanced debugging feature that is generally beyond the scope of what you would expose to your customers. As such, this is not available in the API. Please reach out if there is interest in exposing this feature to your customers.