CPA = Cost per Action

There are certain subdivisions of cpa.

Email submits = Users fill in their email and when the email is verified you will get a conversion.

Zip submits = Same as email submits but instead they need to give out their zip code.

CPC = Cost per click. You will get paid for every click,usually this is 1 cent.

PPI = Pay per install. You will get paid after the user installs the program in the offer.

Mobile Offers = People need to input their mobile phone number and take a ringtone or wallpaper subscription for example, when your traffic is good you'll make tons with these.

GPT = Get Paid To x, where the "X" is unknown.
The GPT industry involves much more than just offer and survey sites. People sign up on this site through a registration form and they need to verify their email address and complete at least one X.

GPT subdivisions
PTC = Paid to Click
PTR = Paid to Read
PTP = Paid to Post / Paid to Promote
Therefor GPT could also be
GPTR = Get Paid To Read
GPTC = Get Paid To Click



There are a lot of subdivisions that I haven't explained but as soon as they will be added to onlinelogic I will explain them.