Hi, no the sponsorship agreements do not make use of the billing provider API as confirmed here: https://learn.microsoft.com/en-us/rest/api/consumption/
I did come across a post here: https://stackoverflow.com/questions/53844639/how-do-you-query-usage-details-in-azure-for-csp-sponsored-subscriptions
..which mentions it may be possible using a different API but I have not tried this myself.