Email verification APIs compared
Verification checks whether an address can receive mail before you send, which protects sender reputation and cuts bounces. Vendors sell pay-as-you-go credit packs or monthly plans. The table quotes the pricing we saw on each vendor's page.
Prices verified on vendor pages for 5 of 8 providers below; the rest are marked unknown. Always confirm at checkout. Order: vendor discounts, then free tiers, then standard signups, A–Z. Affiliate status does not affect order.
Comparison table
| Provider | Offer | Published pricing (verified) | Free option |
|---|---|---|---|
| ClearBounce | Standard signup | unknown | Not verified |
| EmailListVerify | Standard signup | unknown | Not verified |
| LeadMagic | Standard signup | Plans from $99/mo (per leadmagic.io). | Not verified |
| mailfloss | Standard signup | Free tier 500 verifications/mo; Lite from $29/mo (10,000 credits/mo); Business from $59/mo (25,000 credits/mo); higher credit tiers available; prepaid one-time credits that don't expire; 7-day free trial on subscriptions (card required) (per mailfloss.com/pricing). | Yes |
| MailVeri | Standard signup | Pricing per mailveri.com/pricing — pay-as-you-go credit packs, no subscriptions, credits never expire: $9/10K, $19/25K, $39/50K (+10K bonus = 60K), $59/100K, $119/250K, $199/500K, $299/1M, $599/2.5M, $999/5M credits. 1,000 free credits on signup (no credit card). | Yes |
| Prospeo | Standard signup | Free plan 100 credits/mo; Starter $49, Growth $99, Pro $249 per user/mo (25% off yearly); 1 credit per verified email, 10 per mobile (per prospeo.io/pricing). | Yes |
| Sealch | Standard signup | Pricing per sealch.com/pricing (slider-based; figures shown at the page's default volume): Pay as you go $49 one-time ($0.49 per 1,000 verified; credits never expire); Monthly $33/mo ($0.33 per 1,000); site advertises from $0.35 per 1,000 at volume; enterprise via sales. 200 free credits on signup, no credit card. | Yes |
| Snov.io | Standard signup | unknown | Not verified |
Pros and cons
Derived only from facts on the vendor pages we checked.
ClearBounce
Pros:
- None verified beyond the listing
Cons:
- No verified public price in our records; you must check the vendor site
EmailListVerify
Pros:
- None verified beyond the listing
Cons:
- No verified public price in our records; you must check the vendor site
LeadMagic
Pros:
- Offers an MCP server or agent integration
- Pricing is published, so you can budget before signing up
Cons:
- Limits and overage rates vary by plan; read them before committing
mailfloss
Pros:
- Free plan, trial or credits to test before paying
- Pricing is published, so you can budget before signing up
Cons:
- Some plans or trials require a card
- Part of the offer is one-time or intro-only; check the ongoing price
MailVeri
Pros:
- Free plan, trial or credits to test before paying
- No card required to start (per vendor page)
- Usage-based billing, so idle months cost little or nothing
- Offers an MCP server or agent integration
Cons:
- Limits and overage rates vary by plan; read them before committing
Prospeo
Pros:
- Free plan, trial or credits to test before paying
- Offers an MCP server or agent integration
- Pricing is published, so you can budget before signing up
Cons:
- Part of the offer is one-time or intro-only; check the ongoing price
Sealch
Pros:
- Free plan, trial or credits to test before paying
- No card required to start (per vendor page)
- Usage-based billing, so idle months cost little or nothing
- Pricing is published, so you can budget before signing up
Cons:
- Part of the offer is one-time or intro-only; check the ongoing price
Snov.io
Pros:
- None verified beyond the listing
Cons:
- No verified public price in our records; you must check the vendor site
How to choose
- Estimate monthly volume. Occasional list cleans suit non-expiring credit packs; continuous signup validation suits a subscription with an API.
- Ask how catch-all and unknown results are billed; some vendors charge only for definitive results.
- Check integrations (your ESP, CRM, or an MCP server for agents) and API rate limits.
- Verification is list hygiene, not permission: you still need consent or a lawful basis to email.
FAQ
What is the cheapest email verification API?
Compare the per-1,000 cost at your volume using the verified prices in the table; pack pricing usually falls with size.
Do verification credits expire?
It varies. Where the vendor page says credits never expire, the table shows it.
Does verifying emails make cold email legal?
No. Follow CAN-SPAM, GDPR and similar laws regardless of verification.
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Categories: Email API deals
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