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Sixtyfour pricing and alternatives: email verification API

Sixtyfour's sitellms.txtBest email verification API in 2026

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50% complete: 3 of the 6 key fields we checkSee the 6 fields
$0.00per 1,000 emailsWe rank 2,475 plans by price. treg's top-up from $10 costs the least per 1,000 emails: $0.00 on average. treg asks one provider after another until one answers. You pay $26.95 per 1,000 emails when no provider answers.Enrich.so, GetProspect and treg are the best email verification API providers in our benchmark.
Plan: Free one of Sixtyfour's 3 plans
Call: POST /verify-email Sixtyfour's only call for this API
API: Email verification API one of Sixtyfour's 11 APIs

About this item

  • Live. The provider checks the email when you call.
  • 3 of the 6 key fields we check. Address, Deliverability, Confidence.
  • Nothing to pay. You get 64 credits a month, enough for 640 calls. Calls stop once your credits run out. Unused credits expire: does not roll over.
  • One call. You send email to POST /verify-email. The call returns whether the address takes mail.
  • Who can get it: anyone aged 18 or over. Keep data: no limit. Use data: with conditions.

Sixtyfour: email verification API alternatives

We list other providers' plans closest to this plan in price per 1,000 emails. Each plan in the table gives live data.

This planSixtyfour, freeEnrich.so, free, POST /email-validationGetProspect, free, POST /v2/email-verificationsSealch, free, POST /api/verifyKaijuVerifier, free, POST /api/v1/jobs, Submit an async bulk job with the SMTP probeFindEmails.com, free
$ per 1,000 emails$0.00$0.00$0.00$0.00$0.00$0.00
Completeness50%50%50%17%50%67%
Billingfreefreefreefreefreefree
Pay$0$0$0$0$0$0
Enough for640 calls a month100 calls, once100 results a month200 calls, once100 results a monthnot published
Freshnesslivelivelivelivelivelive
Who can get itanyone aged 18 or overanyone 18 or over, on a new account, for an organization, someone with authority to bind itanyone 16 or overanyoneanyoneanyone

Every email verification API provider we score, ranked

Sources

From each provider's own pricing page and docs, and from what providers tell us. We read this row from these pages on 2026-10-27.

  1. docs.sixtyfour.ai/api-reference/endpoint/verify-email
  2. docs.sixtyfour.ai/api-reference/enrichment/verify-email.md
  3. docs.sixtyfour.ai/api-reference/errors
  4. docs.sixtyfour.ai/get-api-key
  5. docs.sixtyfour.ai/guides/credits-and-pricing.md
  6. docs.sixtyfour.ai/introduction
  7. sixtyfour.ai/legal/terms-of-service

Product details

The key fields this plan's answer can hold, then each filled column in its row on the sheet.

  • Address
  • Deliverability
  • Confidence
  • Name, not in the answer
  • Place, not in the answer
  • Company, not in the answer
Price
$ per 1,000 emails$0.00
Percall
Billingfree
Aggregators
Aggregatorsnone
Charges
Also pays forfrom the same budget: Company Intelligence · People Intelligence · Deep Investigations · Bulk Intelligence · Find Email · Reverse Email · Find Phone · Reverse Phone · QA Agent · Age Verification · Deep Search · Lookalike Search · Filter Search · Search Export · Enrich LinkedIn Profile
Overage
Units caphard
Not found
$ per 1,000$0.00
In their words
Their pitchCheck a specific address you already have, such as an email typed into a signup or booking form, before you rely on it. The request returns the verdict directly, typically in under a second.
Data
Freshnesslive
What it checksmailbox
Keep datano limit
Use data"The Content and Marks are provided in or through the Services \"AS IS\" for your internal business purpose only." "[...] no part of the Services and no Content or Marks may be copied, reproduced, aggregated, republished, uploaded, posted, publicly displayed, encoded, translated, transmitted, distributed, sold, licensed, or otherwise exploited for any commercial purpose whatsoever, without our express prior written permission." "You may not access or use the Services for any purpose other than that for which we make the Services available. The Services may not be used in connection with any commercial endeavors except those that are specifically endorsed or approved by us." "As a user of the Services, you agree not to: Systematically retrieve data or other content from the Services to create or compile, directly or indirectly, a collection, compilation, database, or directory without written permission from us. [...] Use any information obtained from the Services in order to harass, abuse, or harm another person. [...] Use the Services in a manner inconsistent with any applicable laws or regulations. [...] Engage in any automated use of the system, such as using scripts to send comments or messages, or using any data mining, robots, or similar data gathering and extraction tools. [...] Interfere with, disrupt, or create an undue burden on the Services or the networks or services connected to the Services. [...] Except as may be the result of standard search engine or Internet browser usage, use, launch, develop, or distribute any automated system, including without limitation, any spider, robot, cheat utility, scraper, or offline reader that accesses the Services, or use or launch any unauthorized script or other software. [...] Use the Services as part of any effort to compete with us or otherwise use the Services and/or the Content for any revenue-generating endeavor or commercial enterprise. Use the Services to advertise or offer to sell goods and services. Sell or otherwise transfer your profile."
Plan
Pay$0
You get64 credits a month
Enough for640 calls a month
Expiresdoes not roll over
Rate limit
Per second2
Batch1
Speed
Answerin the call
Median0.91 s
The call
You sendemail
MethodPOST
Path/verify-email
About the plan
PlanFree
Who can get itanyone aged 18 or over
The 3 fields the plan's answer can hold

email, status, score

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