Glossary
eCPC
What a click on your link is worth at the network, when you are paid per action: eCPC = payouts / clicks. The number to compare with the CPC you pay for those clicks.
Also called: effective cost per click.
You buy traffic per click; the network pays per lead. eCPC translates the network's side into click terms. If 1,000 clicks produced $150 of approved payouts, the eCPC is $0.15, and any source selling those clicks below $0.15 is profitable.
Networks show the same figure as EPC, earnings per click, often per hundred clicks (EPC per 100). It is the fastest way to compare offers before running them, with the caveat that it is an average over everybody's traffic.