My browser network inspector shows 303 status code for each request to GET a document at URL /admin.php?dbtech-security/breachcheck&action=check-accounts&startat=269&perpage=10
Each document takes 700ms and 21 requests are done in 20 seconds.
Then it fails.
The same function seems to work by just enabling the 'Enable Account Breach Check' option. Maybe most admins do it that way.