I'm planning on launching a directory site (you might also call it an industry vertical) where companies will have to pay in order to be listed.
I'm planning to do the payment entirely based on a Pay-Per-Click model, meaning creating your directory entry is free, but if a visitor clicks on your entry you pay.
So I'm looking for an existing pay-per-click engine for this; I don't want to do it myself. Advertisers should be a able to create, manage and delete their entries entirely in self-service. Cost-per-click should ideally be managed through an auction.
I've started searching around using terms like "ppc solution", "ppc engine" or "adserver", but haven't found much.
Am I searching for the wrong keywords? What would you suggest?
What I found was * An Indian company that seems rather dubious to me. All the sites in the Testimonials section are not active. * One that a first glance seems to indicate that they don't have a directory feature * One that this looks like a rather small open source solution
Do you have any experience with these systems? Do you know others? Every bit of help will be very much appreciated!
[edited by: tedster at 2:34 am (utc) on Oct 5, 2012] [edit reason] removed specific links [/edit]