Unlike our other APIs, Reveal credit allotment is counted based on monthly unique visitors (MUVs), rather than API requests.
A monthly unique visitor is each unique IP address we detect. Meaning if we see that the same IP address visits your site several times during one 30 day period, we will only count it against your quota one time.
The response types we return are 200, 404 and 422. You can read more about the Reveal API and what the error codes translate to here on our docs page.