# Mailcheck.co, free tier, POST /v1/emails:check: Email verification API

> Get assured your mailing list contains only real emails addresses, get rid of bots and inactive users

Mailcheck.co's email verification API on its Free Tier plan. It costs $0.00 per 1,000 emails. It returns 1 of the 6 key fields we check: Deliverability.
We haven't run Mailcheck.co through [our email verification API benchmark](https://datacircle.dev/best-email-verification-api.txt) 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](https://datacircle.dev/validate-email-apis/treg/top-up-from-10/llms.txt) 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)](https://datacircle.dev/validate-email-apis/disify/9-monthly-starter-post-email/llms.txt) covers any number of emails. Disify's $9 monthly plan costs less up front than treg's top-up from $10.
[MailTester Ninja](https://datacircle.dev/validate-email-apis/mailtester-ninja/23-99-monthly/llms.txt), [Enrich.so](https://datacircle.dev/validate-email-apis/enrich-so/499-monthly/llms.txt) and [GetProspect](https://datacircle.dev/validate-email-apis/getprospect/369-pack/llms.txt) are the best email verification API providers in the Datacircle benchmark.

- This page: https://datacircle.dev/validate-email-apis/mailcheck-co/free-tier-post-v1-emails-check
- [Email validation API: 180+ verification providers compared](https://datacircle.dev/best-email-verification-api.txt)
- Get it: https://mailcheck.co/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing#pricing
- Request: `POST https://api.mailcheck.co/v1/emails:check`
- API key: with the plan, on https://mailcheck.co/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing#pricing
- Its API docs: https://mailcheck.co/l/docs?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing#tag--email
- Sold by: Mailcheck.co (https://mailcheck.co?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing)
- Checked: 2026-11-05

## In the answer

- Completeness: 17%
- Deliverability: ✓

## Price

- $ per 1,000 emails: $0.00
- Per: result
- Billing: free

## Aggregators

- Aggregators: none

## Charges

- Also pays for: from the same budget: Process a single email synchronously

## Not found

- $ per 1,000: $0.00

## In their words

- Their pitch: Get assured your mailing list contains only real emails addresses, get rid of bots and inactive users

## Data

- What it checks: format, mail servers, disposable domains, mailbox
- Keep data: no limit
- Use data: You may not access or use the Site for any purpose other than that for which we make the Site available. The Site 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 Site, you agree not to: [...] Systematically retrieve data or other content from the Site to create or compile, directly or indirectly, a collection, compilation, database, or directory without written permission from us. [...] 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. [...] Use any information obtained from the Site in order to harass, abuse, or harm another person. Use the Site as part of any effort to compete with us or otherwise use the Site and/or the Content for any revenue-generating endeavor or commercial enterprise. [...] Use the Site in a manner inconsistent with any applicable laws or regulations.

## Plan

- Pay: $0
- You get: 100 results
- Enough for: 100 results

## Speed

- Answer: by polling

## The call

- You send: emails
- Method: POST
- Path: /v1/emails:check

## About the plan

- Plan: Free Tier
- Who can get it: anyone 18 or over (a minor needs a parent's or guardian's permission), 10 emails without a payment method, 100 once billing information is verified

## The 7 fields the plan's answer can hold

operation name, total count, processed count, free limit reached, create time, done, result file URL

## Mailcheck.co's plans (5)

- [Mailcheck.co, free tier, POST /v1/emails:check](https://datacircle.dev/validate-email-apis/mailcheck-co/free-tier-post-v1-emails-check/llms.txt): $0.00 per 1,000, 17% complete
- [Mailcheck.co, $10 monthly, Pro, POST /v1/emails:check](https://datacircle.dev/validate-email-apis/mailcheck-co/10-monthly-pro-post-v1-emails-check/llms.txt): $10.00 per 1,000, 17% complete
- [Mailcheck.co, $30 monthly, Agency, POST /v1/emails:check](https://datacircle.dev/validate-email-apis/mailcheck-co/30-monthly-agency-post-v1-emails-check/llms.txt): $6.00 per 1,000, 17% complete
- [Mailcheck.co, $90 monthly, Enterprise, POST /v1/emails:check](https://datacircle.dev/validate-email-apis/mailcheck-co/90-monthly-enterprise-post-v1-emails-check/llms.txt): $4.50 per 1,000, 17% complete
- [Mailcheck.co, contact us, Custom, POST /v1/emails:check](https://datacircle.dev/validate-email-apis/mailcheck-co/contact-us-custom-post-v1-emails-check/llms.txt): 17% complete

## Mailcheck.co's calls (2)

- `POST /v1/emails:check`: [Mailcheck.co, free tier, POST /v1/emails:check](https://datacircle.dev/validate-email-apis/mailcheck-co/free-tier-post-v1-emails-check/llms.txt)
- `POST /v1/singleEmail:check`: [Mailcheck.co, free tier, POST /v1/singleEmail:check](https://datacircle.dev/validate-email-apis/mailcheck-co/free-tier-post-v1-singleemail-check/llms.txt)

## Mailcheck.co's APIs (1)

- [Mailcheck.co: email verification API pricing, 5 plans, POST /v1/emails:check](https://datacircle.dev/validate-email-apis/mailcheck-co/free-tier-post-v1-emails-check/llms.txt)

## Mailcheck.co: email verification API alternatives

- [BetterEnrich, $900 pack, One-time Payment, 40K credits, POST /api/v1/verify-catch-all-email](https://datacircle.dev/validate-email-apis/betterenrich/900-pack-one-time-payment-40k-credits-post-api-v1-verify-catch-all-email/llms.txt): $4.50 per 1,000, 17% complete, live
- [WhoisXML API, $540 yearly, Yearly subscription 10,000 Queries, GET /api/v3](https://datacircle.dev/validate-email-apis/whoisxml-api/540-yearly-yearly-subscription-10000-queries-get-api-v3/llms.txt): $4.50 per 1,000, 50% complete, live
- [MailRambo, $9 pack](https://datacircle.dev/validate-email-apis/mailrambo/9-pack/llms.txt): $4.50 per 1,000, 50% complete, live
- [Heybounce, $225 pack, Pay As You Go 50,000 credits, GET /validate](https://datacircle.dev/validate-email-apis/heybounce/225-pack-pay-as-you-go-50000-credits-get-validate/llms.txt): $4.50 per 1,000, 50% complete, live

## Sources

From each provider's own pricing page and docs, and from what providers tell us. We read this row from these pages on 2026-11-05.

- https://app.mailcheck.co/dashboard/payment_plans?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://app.mailcheck.co/openapi.json?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://mailcheck.co?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://mailcheck.co/create-api-key?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://mailcheck.co/faq?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://mailcheck.co/l/docs?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://mailcheck.co/privacy?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://mailcheck.co/terms?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing