Work in progress Learn More

Datacircle

Check Harbor pricing: email verification API

Check Harbor's sitellms.txtEmail validation API: 180+ verification providers comparedCheck Harbor: email verification API alternatives

Is Check Harbor yours? Write to us about this page. We invite selected tool providers to our WhatsApp group.

33% complete: 2 of the 6 key fields we checkSee the 6 fields
$0.00per 1,000 emailsWe haven't run Check Harbor through our email verification API benchmark yet.This plan is free. We rank 3,753 plans for email verification APIs by price. Half the plans cost $1.98 per 1,000 emails or less.treg's top-up from $10 is the cheapest paid plan per 1,000 emails: $0.00 on average. treg asks one provider after another until one answers. You pay $68.365 per 1,000 emails when no provider answers.Disify's $9 monthly plan (/email) covers any number of emails. Disify's $9 monthly plan costs less up front than treg's top-up from $10.MailTester Ninja, Enrich.so and GetProspect are the best email verification API providers in the Datacircle benchmark.
Plan: Free one of Check Harbor's 7 plans
Call: POST /v1/email/validate Check Harbor's only call
API: Email verification API Check Harbor's only API

About this item

  • Freshness. We don't know how fresh this plan's data is.
  • 2 of the 6 key fields we check. Deliverability, Confidence.
  • Nothing to pay. You get 1,000 credits a month.
  • One call. You send email to POST /v1/email/validate. You set the content-type header to "application/json". The call returns whether the address takes mail.
  • Anyone can get it. Keep data: no limit. Use data: with conditions.

Check Harbor: email verification API alternatives

Check Harbor alternatives: every email verification API provider ranked

We list other providers' plans closest to this plan in price per 1,000 emails.

This planCheck Harbor, freeMailTester Ninja, free, No tokenEnrich.so, free, POST /email-validationGetProspect, free, POST /v2/email-verificationsPrime Verifier, free, POST /v1/verify/singleA-Leads, free
$ per 1,000 emails$0.00$0.00$0.00$0.00$0.00$0.00
Completeness33%50%50%50%50%50%
Billingfreefreefreefreefreefree
Pay$0$0$0$0$0$0
Enough fornot published300 calls a month100 calls, once100 results a month100 calls, oncenot published
Freshnessunknownliveliveliveunknownunknown
Who can get itanyoneanyone at least 18 years old, or the age of majority in their jurisdictionanyone 18 or over, on a new account, for an organization, someone with authority to bind itanyone 16 or overanyone 18 or older able to form a binding contractanyone who doesn't directly compete with A-Leads in lead intelligence, data analytics or similar software

Sources

From each provider's own pricing page and docs, and from what providers tell us. We read this row from these pages on 2026-11-02.

  1. checkharbor.pages.dev
  2. checkharbor.pages.dev/terms

Product details

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

  • Address, not in the answer
  • Deliverability
  • Confidence
  • Name, not in the answer
  • Place, not in the answer
  • Company, not in the answer
Price
$ per 1,000 emails$0.00
Billingfree
Aggregators
Aggregatorsnone
Charges
Also pays forfrom the same budget: IP intelligence · Phone validation
Not found
$ per 1,000$0.00
In their words
Their pitchProduction-ready email, phone, and IP validation API. Start free with 1,000 credits/month — no credit card required.
Data
Keep datano limit
Use dataYou agree to use the Service only for lawful, legitimate purposes — such as cleaning signup data, improving deliverability, and preventing fraud and abuse. You must not use the Service to: send unsolicited bulk messages (spam), harass, or stalk any person, enable fraud, identity theft, or any unlawful activity, validate data you have no lawful basis to process, or violate any applicable privacy law (including GDPR or KVKK) with respect to the data you submit, attempt to reverse engineer, resell, or rebrand the Service as your own competing validation product, circumvent rate limits, credit metering, or security controls
Plan
Pay$0
You get1,000 credits a month
Rate limit
Batch1
Speed
Answerin the call
The call
You sendemail, content-type header "application/json"
MethodPOST
Path/v1/email/validate
About the plan
PlanFree
Who can get itanyone
The 3 fields the plan's answer can hold

valid syntax, deliverability, score

Best GTM APIs