1. CPC:

This is the classic Cost per Click. You will get paid when your site visitor clicks the ad.

2. CPM:

Cost Per Mille. You will get paid based on impression. A single site visitor is equal to one impression.

3. CPA:

Cost Per Action. You will get paid based on user action such as a sale, registration, file download or a survey. CPA is the highest-paid ad compare to CPC and CPM.

4. CPC/CPM/CPA

If you want to get paid for both CPC, CPM, CPA. This is highly recommended.

5. POP

Same as CPC, you will get paid based on click when a visitor visits your site.