The number of calls you made for the ongoing term (monthly or annual) is always shown in the x-quota-remaining header of the API response.

To better manage your API calls volume, you can read more here about what counts as an API call on Soundcharts.

By default, all API plans have a 10% threshold, so you can go slightly above the number of calls you purchased for a given month before receiving a 429 'too many requests' error.

If that happens, please get in touch with your point of contact at Soundcharts.