In addition to your monthly subscription fee, additional usage fees may apply when exceeding your monthly allowance for certain tools. You can see a full breakdown of the usage allowances on each tool here.
Raven bills for the maximum usage per month. So, for example, Start accounts are allotted 40 Backlink Reports total. If you were to run two additional reports at $1/month each, you would be billed for $2 total at the end of your billing period — even if you deleted one of those reports.
In addition to usage overages, Raven also bills for content ordered through Textbroker.