AlternateURL is a website that provides a way for you to earn income from adsense PSA (Public Service Ads).
Here is what they say:
“ If you use Google AdSense or any another ad program to earn money from your website, now you can increase the amount of revenue you make automatically.
Most online ad programs, including Google, will sometimes show default ads, or public service announcements (PSAs) when they have no paying ads to show. This can happen for many reasons, especially when their ad code crawls your pages.
AlternateURL lets you replace those ads with paying ads. Just use the code we provide to replace your ad program’s default ads. “