PPC search engine? I've not heard of that. If you mean pay per search then I can recommend Homepages Friends. You can earn 2 or 3 cents for every Yahoo! search you make with them and it's a PayPal payout. They are sometimes slow with payment but they do pay - as my Homepages Friends proof of payment shows.
PPC search engine meaning: A PPC listing on a search engine results page typically consists of a title, which usually is your website's name or perhaps a short heading (around 50 characters maximum) and also a short (usually no more than 200 characters long) description of your service or some promotional wording. Some PPC search engines strictly control the text that can appear in the listing, while others are more open to using the advertiser's own text.