Performance marketing runs on five abbreviations, and most confusion in briefs, invoices and payout arguments traces back to two parties holding different definitions of the same one. Here is each model, what it pays for, and what it quietly assumes.
CPA — cost per action
The umbrella model. The advertiser defines an action — a purchase, a first deposit, a completed KYC, a subscription start — and pays a fixed amount each time it happens. Everything upstream of that action (impressions, clicks, installs, visits) is unpaid effort by the network and its publishers.
The strength of CPA is precision: you can place the payout on the exact event that makes you money. The assumption it carries is measurability — if your systems cannot report the action reliably through a postback, the model degrades into arguments.
CPL — cost per lead
The billable event is a lead: contact details submitted by a person matching your written definition — geo, age band, required fields, consent. The definition is the contract. A network that bills every raw form fill and a network that validates syntax, deliverability and duplicates before billing will quote you very different CPLs, and the cheaper-looking one is usually the expensive one.
The practical benchmark: on a validated Indian lending campaign, expect 60–80% of leads to be contactable within three attempts. Below that, the traffic mix — not the sales team — is the problem.
CPS — cost per sale
Commission on confirmed orders, as a percentage of order value or a flat fee. The word doing the work is confirmed: in cash-on-delivery markets, where a quarter to a third of placed orders never complete, commission on placed orders means paying for failures. The correction — commission on delivered orders with a logistics-matched reversal window — is the difference between a CPS programme that compounds and one that leaks.
CPI and CPR — the app pair
CPI pays per install, attributed by your mobile measurement partner. CPR pays per registration — install plus account creation, usually OTP-verified. The one-step difference matters more than it looks: an install can be faked by a device farm for pennies, while a verified registration costs a fraudster real effort. Moving the payout one event deeper filters most low-quality supply before it reaches your invoice.
The models nobody should confuse with these
CPM (cost per thousand impressions) and CPC (cost per click) price exposure and attention. They are inputs, not outcomes — useful when reach is genuinely the objective, dangerous when dressed up as performance. If a proposal quotes CPM and promises conversions, the conversion risk is yours; it has just been renamed.
Choosing in one table
| Your revenue event | Start with | Graduate to |
|---|---|---|
| App usage | CPI | CPR, then in-app CPA |
| Sales-team calls | CPL | CPA on call-connected or application |
| Online orders | CPS (delivered) | Tiered CPS + new-customer premium |
| Subscriptions | CPA on trial | CPA on paid conversion |
The pattern behind every row: begin where measurement already works, then push the billable event downstream as fast as your reporting allows. Each step deeper transfers risk from you to the network — which is the entire point of buying outcomes instead of media.
Written by the Performetra campaign team. If you want this applied to a live campaign rather than read about, tell us what you are running.