Google Adsense
Seen as one of the most reliable advertising networks, Google Adsense is the primary choice of advertising for many publishers. Adsense can be placed on your homepage, and possibly subpages, but you are prohibited from placing it on proxied pages. Google Adsense does not want itself or its advertisers possibly being mistaken as endorsing any content your visitors might browse to with your proxy.
Yahoo Publisher Network
A relative newcomer to the advertising market, Yahoo Publisher Network (YPN) is similiar to Google Adsense in many ways. There are however some stark differences in what they find acceptable and at the time of writing they are only accepting U.S. publishers into their program. I woulden't use YPN for proxy websites because they have been known to ban publishers with non-U.S. and low converting traffic - something that is applicable to most web proxies.
Adbrite
Adbrite is an excellent tool for filling up ad space on your proxied pages, I have personally asked an Adbrite representative whether it is acceptable and they said that Adbrite may be used in this way. In my experience you can expect a modest profit. Although the eCPM may be low, compared to other methods it can bring in a nice secondary revenue source. It may be useful to change the ad colors although that time could be better spent.
Adversal
Adversal is a widely used advertising network that provides pop-ups and pop-unders to visitors. This type of advertising is however very unpopular with visitors, I tested it for a couple days out of a month on my more established proxy websites - any longer and I would probably start losing visitors. Typically your visitors dont want to be pestered by popups, I personally dont like unexpected windows opening. You have to weigh up the cost of inconvenience versus the normally low profit.
CPA Advertising
Another avenue for monetizing your ad space is CPA programs. Cost Per Action is a form of direct advertising, instead of general or targeted adverts you usually place just one fixed banner / link / button on your website. When your visitors click on an advertisement and complete the requirements for it you will get paid. Common CPA schemes involve the visitor subscribing to a mailing list, entering a phone number or buying a product. Obviously you want to target products that best suit your audience so its recommended you experiment with different CPA offers. We recommend the following established CPA programs: Commission Junction, Azoogle and Share A Sale.
Advertisers regularly change their acceptable usage policies in regard to web proxies so it is best to send off an email to check. You should also conduct a little research on new advertisers. Im sure you'd rather not have a non-payment at the end of the month.
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