Traffic cost calculation data center?
I would image that information is highly proprietary. The consumer price may have little to do with the actual circuit costs. They may be used to cover other, unrelated things (e.g., to recoup profits on other services sold as a loss).
The cost for a communications circuit is mostly independent of the amount of actual data flowing over it. But if your idea is some sort of compression algorithm for HTTP, how will you convince browser and application manufacturers to use it? What's their incentive to rewrite their software?