Shrinkearn is a popular url shortener, that is never struggling to monetise its links well, as the owner seems to be an expert with ad networks.
First off, they use a native ad from AdsKeeper. This network offers an RPM (not CPM, i'll explain the difference further in the article) of around $0.7 so it's already a good start for them. Next, they use a banner from ad network themoneytizer.com, which used to be an adsense partner (it might still be, but i haven't seen an adsense ad in their ads for weeks), and moneytizer pays CPM only, of about $0.3. This gets them to roughly $1. They also have pop ups from propeller ads and mobile10. Although most people have a bad experience with m10, like me, they've been working with ShrinkEarn since it's adsense ban. PropellerAds normally offers CPM around $0.3 and m10 has around $1. This will get them to $2.3, and because the second ad page is the same they should be earning roughly $4.5 altogether.
Simple ads over the two pages:
AdsKeeper x2 - $1.4 (CPC/RPM)
Moneytizer x2 - $0.6 (CPM)
PropellerAds x2 - $0.6 (CPM)
m10 x2 - $2 (CPA, CPM)
RPM - Earnings from Clicks and CPM in ad networks altogether per 1000 impressions.
CPM - Earnings from just views and no clicks per 1000 impressions
CPC - Earnings for 1 click
CPA - Earnings when someone completes an action such as a signup.