The price it is based on the number of backlinks to the website.
1-100 domains: $125
101-300 domains: $200
301-500 domains: $300
For a bigger number please use Extra-Gigs.
The links audits it is done manually for each domain. Not many persons are good on analyzing the sites links. I have a lot
of experience, I analyzed more than 500 domains in the last years. If
you consider that you have problems with the links, you have received
links in an unusual way, then I am here to help you