I built this website bl4btc.io it works like any other website for buying and selling backlinks/link building, But with much lower fees and widrawals/deposits are only made in bitcoin. I need help finding people who want to monetize their domains and get paid in bitcoin. I'm looking for people to help me advertise, and I'm willing to give up half my profits to someone who can help. Also I'll be building out an API for it very soon. If you are not interested but visit the site, feel free to leave feedback.
You say your fee is low,1 bitcoin = 1000 credits is not low by any standard.Anyway do you accept only bitcoin related or any niche sites ? If you accept all niche,I suggest you add other payment methods also.You can try to promote your site at other webmaster forums like digitalpoint,warriorforum etc