This post is from a low-reputation account and contains an unverified outbound link. Be cautious before clicking external links.
Information click.....
Currently, we document how to read raw bandwidth data from the blockchain:
https://developers.steem.io/apidefinitions.html#apidefinitions-witness-api
We should add more detail on how to process the raw data so that it can be presented like steemd.com as a percentage available