title: How to use Google Cloud Billing APIs to calculate usage costs?
body: <p>How can I use the Google Cloud Billing APIs to retrieve my total expected bill / accumulated bill so far?</p>
  
  <p>Is there an API call that simply returns the cost so far for a certain billing account? </p>
  
  <p>Or alternatively, a combination of calls - one for retrieving the usage data and the other with the prices for the various Google Cloud services - to calculate the costs myself?</p>
  
  <p>Thank you</p>