Email Checker API: Verify Addresses in Code for $39 a Month

An email checker API takes one address per call and returns whether it can receive mail. SimpleVerifier's API is included with the $39 a month Pro plan: 10,000 calls a month, then $1.50 per 1,000 on monthly billing. You get 100 free checks first, with no card.

Here is what to check before you pick one, how the pricing works, and where another vendor costs less.

What to check before you integrate

• A real mailbox check. Syntax and domain lookups miss addresses that bounce. Our syntax versus SMTP post explains the gap.
• A third result. Valid and invalid are not enough. Catch-all domains and silent servers need a risky status with a reason.
• Latency handling. Mail servers can be slow. Plan a timeout and a soft fallback.
• Pricing you can predict. Calls are what you pay for, and a signup form can make several per user. See email verification API cost per month.
• Docs and keys. Read the API docs and quickstart before you commit.

How SimpleVerifier fits

Pro is $39 a month. It includes 10,000 API calls a month, then $1.50 per 1,000 on monthly billing, and also CSV verification: the first 100,000 checks a month at full speed, then slower, never cut off. Business and Agency include more calls. Try a check on the verify page, and compare options on the best email verification API page. For one-off lists, the CSV email verifier needs no code. Not sure which fits? Read API or CSV upload.

Price comparison from public pricing pages

Figures come from public pricing pages as recorded in our comparison data. Confirm before buying.

Option	What it sells	Checked
Abstract API	$39 a month for 15,000 requests; $99 for 50,000	12 Oct 2026
Mailboxlayer	$74.99 a month for 50,000 requests	12 Oct 2026
MailboxValidator	API packs: 10,000 for $59.95, 100,000 for $199.95	12 Oct 2026
NeverBounce	Packs: 10,000 for $50	2 Nov 2026
SimpleVerifier Pro	$39 a month, 10,000 API calls included, then $1.50 per 1,000	Our own plan

When another vendor is cheaper

At 15,000 calls a month, Abstract API's $39 plan includes all of them while Pro would add overage for 5,000 calls. At 50,000 calls a month, Pro with overage is more than Abstract's $99 tier; the math is in our cost post, and Business can be the better fit at that point. If you only make occasional bursts of calls, a prepaid pack such as NeverBounce's 10,000 for $50 avoids a subscription. Pro wins when you also verify CSV lists, since one $39 plan covers both. See the Abstract API and NeverBounce pages.

Bottom line

Pick on how the API reports uncertainty, then on cost at your real call count. Test with the free checks before you write any integration code.