Is there an API to get "Bulk download size used" stats Out of 500MB Daily Limit?

[Raja]

Hello Nation!

I have setup a smart campaign to trigger an alert to our Marketo users, once the instance hits 75% of daily API call limits. 

Rest API :  /rest/v1/stats/usage.json

I want to extend this setup to the "Bulk API Extertact" alert too after reaching the limit of 500 * 75% = 375MB.

Is there any Marketo API for the same?

@SanfordWhiteman  Any thoughts?