
$39/2,000 credits Free tier MCP API
Why it comes up: Email verification with a well-known deliverability brand and API.
Stands out: Validation plus quality scoring on one meter, with a real free 100-credit allowance and a public $99/month subscription.
Watch out: Pay-as-you-go starts at $39 for 2,000 validations if you do not want a subscription. Heavy lists will burn the 10,000-credit ONE cap.
Best for
- Recruiting and sales teams cleaning lists before send
- Ops that want validation as an API
- Desks that need scoring, not only deliverable/undeliverable
4.8 on Capterra from 591 reviews
Read the ZeroBounce write-up · EmailListVerify vs ZeroBounce
Why it comes up: List cleaning from the ZoomInfo family for marketing stacks.
Stands out: A long-running list-cleaning API used next to marketing and recruiting outbound, not a finder.
Watch out: Plans start at $49/mo, sold as credit packs. You still need a finder if the list has no addresses yet.
Best for
- Ops cleaning large outbound lists
- Teams that want verification as an API
- Marketing and recruiting desks sharing one cleaner
4.4 on Capterra from 51 reviews
Read the NeverBounce write-up · EmailListVerify vs NeverBounce
Why it comes up: High-volume verification with cheap credit packs.
Stands out: Risky results are refunded, credits never expire, and catch-all checks are included at no extra cost.
Watch out: You pay upfront for a pack, not a monthly plan. The $39 entry pack is 10,000 credits, so small one-off lists cost more per email.
Best for
- Marketers cleaning lists before a campaign
- Senders who verify in bursts, not every month
- Builders adding real-time checks via the API
Read the MillionVerifier write-up · EmailListVerify vs MillionVerifier

$5/500 verifications Free tier API
Why it comes up: Verification API with quality scoring for product teams.
Stands out: Unknown results are refunded as credits, so you do not pay for a check that returns no clear answer.
Watch out: Packs are paid upfront, not billed monthly. Very large volumes move to custom pricing through sales.
Best for
- Senders who want 100 free checks with no card
- Small teams that start with a $5 pack
- Developers verifying emails at signup via the API
Read the Kickbox write-up · EmailListVerify vs Kickbox