Cost per Verified Contact: Budgeting a Cold Email List From Data to Valid Address

Your cost per verified contact is total data and verification spend divided by the number of addresses that come back valid. It is higher than the price per lead on the data invoice, because invalid, unconfirmed and duplicate rows are paid for and never mailed. Calculating it per source tells you which lead source is actually cheap, which is rarely the one with the lowest invoice price.

Every figure in the example below is made up to show the arithmetic. Put your own in.

The formula

Cost per verified contact = (data cost + verification cost) / valid rows.

Three inputs matter:

1. Data cost: what you paid for the rows.
2. Verification cost: your plan price, or its share if the plan covers several jobs.
3. Valid rows: the count with status valid, after removing duplicates.

Risky rows are tracked in their own column until a test batch shows they perform.

A worked example (illustrative)

Two sources, each 1,000 rows. These are invented numbers for the method, not benchmarks.

	Source A	Source B
Rows bought	1,000	1,000
Price per row	$0.10	$0.05
Data cost	$100	$50
Valid after checking	800	500
Risky	100	300
Invalid	100	200
Cost per valid contact (data only)	$0.125	$0.10

Source B looks cheaper per row and still shows a lower data cost per valid contact in this example. Change the valid counts and it flips. If Source B had only 300 valid, its data cost per valid contact would be about $0.167, above Source A. The point is that you cannot tell from the invoice.

Add verification: if a plan costs $39 a month and you run both lists through it, add each source's share of the plan to its data cost before dividing.

Spreadsheet layout

Column	What goes in it
Source	Where the rows came from
Rows bought	Count
Data cost	Invoice total
Valid / Risky / Invalid	From the verification report
Cost per valid	(Data cost + verification share) / Valid
Valid rate	Valid / Rows bought

Review it after each batch. A source whose valid rate keeps dropping is getting worse. See testing a new lead source for a small-batch way to compare.

What the number leaves out

• Reply value. A cheaper contact that never replies is not cheaper.
• Cost of bounces. An inbox damaged by a bad list has a replacement cost. See cold email infrastructure cost per month.
• Role-based addresses. Valid rows such as info@ and sales@ may exist and still suit cold outreach poorly. See role-based email addresses.

Using it to decide

1. Rank sources by cost per valid contact, not cost per row.
2. Drop sources with a low valid rate even if they are cheap.
3. Revisit the ranking when a source changes provider or method.

For the wider cost picture, see the ROI of email verification.

Plans and trial

New accounts get 100 free checks with no card, so you can measure one sample's valid rate before buying more data. Pro is $39 a month, with the first 100,000 checks a month at full speed, then slower, never cut off. Business is $99 and Agency is $249 with 750,000 checks a month. See pricing or start on the verify page.