Two agencies quote you the same cost per lead. Same vertical, same market, same price. One of those quotes will make you money, the other will quietly drain your sales team’s calendar - and the difference is hidden in a single paragraph: the definition of what you’re paying for.
“Lead” is not a unit of measurement
A form fill is a lead. A phone number scraped into a list is a lead. A homeowner who confirmed they own the roof, pay a $200+ electric bill, and agreed to a specific appointment time is also a lead. These are not the same product, and they should not have the same price.
That’s why the first thing to read in any pay-per-outcome offer is not the price but the written definition: what fields, what verification, what qualification criteria, what happens when a delivered contact misses them. A serious partner puts that definition in the contract and replaces outcomes that fail it. If the definition lives in the sales call instead of the contract, the price means nothing.
The math that follows from the definition
Once the definition is fixed, comparing offers becomes arithmetic instead of vibes. Take the cost per outcome, divide by the close rate that outcomes of that quality actually achieve, and you get your true cost per signed deal. A cheap, loosely-defined lead with a 1% close rate costs you more per deal than a well-defined one at five times the price - before you even count the hours your closers burn on dead conversations.
This is also why we’re comfortable publishing our clients’ numbers: conversions like 7-10% from lead to signed contract come from signed reference letters, and they only happen when the definition upstream is strict.
What to ask before you sign
Ask for the definition in writing. Ask what percentage of delivered outcomes get replaced, and why. Ask for the close rates existing clients in your vertical achieve. An agency that shares risk with you will answer all three without flinching - because a strict definition is what makes its own economics work.