In order to fairly share actual cost with partners, it would be very helpful to provide the billing details currently available as a PDF in the API. Alternatively have it downloadable in a more machine readable format from the web site.
The reason is that the cost for droplets run only for a couple of hours should be charged to the partner using that droplet (based on internal logging) and not be split equally.
Balance information is now available via the API. See the API changelog for more details: https://developers.digitalocean.com/documentation/changelog/api-v2/new-endpoint-for-retrieving-balance-information/
Stay tuned for more updates.