Email Verifier API

Email Verifier API is an email-screening service for application developers and teams that maintain mailing lists. It suits users who want to combine signup checks with occasional bulk cleanup, rather than commit to a recurring subscription.

Overview

The service checks addresses in real time to help reduce bounces and protect sender reputation. Browser checks, CSV uploads and a REST API support both one-off verification and workflows built into an application.

Each verification uses one credit, but only Passed and Failed results are billed; unknown catch-all results cost nothing. Purchased credits never expire, and purchases are one-time rather than automatic renewals. That flexibility favors irregular workloads, though teams with steady demand must keep an eye on their balance and buy more credits as needed.

Key features

Address checks and bulk cleaning

The engine runs 16 checks, covering syntax, SMTP, MX and DNS validation along with spam trap, disposable, role-account and catch-all detection. This goes beyond catching malformed addresses, although catch-all results can remain inconclusive. CSV upload makes the service useful for cleaning an existing list as well as screening individual signups.

API and connected workflows

The REST API accepts GET and POST requests, returns JSON by default and can return XML with an xml parameter. Language guides cover C#, Go, Java, Node.js, PHP, Python, Ruby and Swift, giving developers several common implementation paths. The service also supports real-time form checks and says users can verify lists in Excel and Google Sheets, or upload CSVs compatible with HubSpot, Salesforce and Pipedrive.

Privacy and security

Email Verifier API claims ISO 27001 and SOC 2 Type II certification and GDPR and CCPA compliance. Its privacy policy says submitted addresses are purged after checking, while SHA512 hashes are deleted after 30 days; it also says data is transmitted over HTTPS and encrypted in communication with verification servers. These are useful assurances for teams handling contact data, but they do not remove the need to assess the service against an organization's own requirements.

Pricing

The free account starts with 100 credits and requires no credit card. A browser check without an account is capped at five per day, so the account is the more useful way to evaluate repeated checks. The free allocation is a fixed starter balance, not a stated recurring quota.

Plan	Price	Best fit
100 Credits	free	Initial evaluation or a small one-off list
1,000 Credits	$9.95, paid once	Occasional cleanup, at $0.0100 per email
5,000 Credits	$34.95, paid once	A modest campaign, at $0.0070 per email
10,000 Credits	$49.95, paid once	Regular list work, at $0.0050 per email
25,000 Credits	$124.95, paid once	Larger one-off cleaning, at $0.0050 per email
50,000 Credits	$249.95, paid once	High-volume checks, at $0.0050 per email
100,000 Credits	$399.95, paid once	Bulk needs with a lower unit rate, at $0.0040 per email
250,000 Credits	$749.95, paid once	Large batches, at $0.0030 per email
500,000 Credits	$1,499.95, paid once	Very high-volume work, at $0.0030 per email
1,000,000 Credits	$2,499.95, paid once	The lowest stated unit rate, $0.0025 per email

All paid options are one-time purchases; there is no automatic renewal, and unused credits remain available. The price per email falls with larger packs, but the discount requires a much larger upfront outlay. Since only definitive Passed and Failed results are billed, the number of credits consumed can be lower when checks return unknown catch-all results.

Platforms

Email Verifier API is available on the web and through its API. Excel and Google Sheets verification, plus CSV workflows for HubSpot, Salesforce and Pipedrive, extend its reach into common list-management routines.

Who it's for

This is a sensible fit for developers adding validation to signup forms and businesses that periodically clean contact lists. One-time credit bundles and non-expiring balances suit unpredictable usage. It is less compelling for buyers who need a recurring monthly allowance or want a stated monthly free quota.

Pros and cons

• Pros: API, form checks and CSV cleaning cover both live signups and existing lists.
• Pros: Unknown catch-all results are not billed, limiting spend on inconclusive checks.
• Pros: One-time credits do not expire or renew automatically, which suits uneven workloads.
• Pros: Multiple language guides and spreadsheet workflows accommodate different implementation and list-cleaning habits.
• Cons: The no-account browser tool allows only five daily checks; the 100-credit account balance is more useful but finite.
• Cons: The lowest unit rate requires buying one million credits for $2,499.95, paid once, a substantial upfront commitment.
• Cons: Catch-all addresses can produce unknown results, so the check may not settle every address's status.

Alternatives

For a broader comparison, see Email Verification Services.

• VerifyAnyEmail is worth considering if a monthly free allowance and iOS access matter: its free plan includes 1,000 credits per month, with a 10-request-per-minute limit and small batches of up to 10.
• Voila Norbert is another freemium option with web, API and extension platforms for readers comparing verification tools.
• ZeroBounce may suit buyers who prefer a monthly free allocation: its free business account includes 100 monthly verifications, and its stated minimum purchase is 39.00 USD for 2,000 addresses.
• MyEmailVerifier offers 100 free credits daily without a card, so it is an alternative for readers who want a renewable daily free allowance.
• QuickEmailVerification provides a free tier of 100 credits per day that resets daily, a useful fit for modest recurring checks.
• Reoon Email Verifier includes 20 emails per day for life, 100 instant credits and both single and bulk verification in its free tier, making it relevant to readers seeking an ongoing free option.
• DeBounce offers pay-as-you-go credit options from 5,000 to 5 million, with credits that never expire, for readers comparing other non-expiring bulk packs.
• emailverifier.dev starts with 1,000 credits, one API key per project and REST and MCP access; it may suit readers who want those access options in a starter plan.

Verdict

Choose Email Verifier API if you need both API-based signup screening and CSV list cleanup, and prefer buying non-expiring credits only as demand arises. Its clearest advantage is billing only for definitive results without a recurring charge. Look elsewhere if you need a renewable free allowance, or if your volumes are too small to justify the larger packs behind its lowest per-email rates.