You can connect a Google AdSense account to your custom search engine to make money on contextually-relevant ads placed into the search results. Advertisers compete for placement in the search results, and when someone clicks on one of their ads, you can make a portion of the revenue. If you don’t already have an AdSense account, get one. Once you’ve joined AdSense, you can make money off of your search engines by associated them with your AdSense account. Note that if you create a new AdSense account, you’ll receive a confirmation email that you can use to activate your account. You won’t start making money until you have completed this activation process. Note that revenue is only shared for the ads that appear on custom search engine on your site. No revenue is shared if the user leaves your site, for example, by clicking on the find on Google links. Google Help.