# Check Mail, free: Email verification API

> Check-Mail.org is a free email validation API that helps developers verify email addresses and block disposable or temporary emails in real-time.

Check Mail's email verification API on its Free forever plan. It costs $0.00 per 1,000 emails. It returns 3 of the 6 key fields we check: Address, Deliverability, Company.
We rank 3,215 plans by price. [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 our benchmark.

- This page: https://datacircle.dev/validate-email-apis/check-mail/free
- [Best email verification API in 2026: providers compared](https://datacircle.dev/best-email-verification-api.txt)
- Get it: https://check-mail.org/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- Request: `POST https://api.check-mail.org/v2/`
- API key: with the plan, on https://check-mail.org/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- Its API docs: https://docs.check-mail.org/api-and-authentication/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing#verify-an-email-address
- Sold by: Check Mail (https://check-mail.org?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing)
- Checked: 2026-11-02

## In the answer

- Completeness: 50%
- Address: ✓
- Deliverability: ✓
- Company: ✓

## Price

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

## Aggregators

- Aggregators: none

## Charges

- Also pays for: nothing else

## Overage

- Units cap: hard

## Not found

- $ per 1,000: $0.00

## In their words

- Their pitch: Check-Mail.org is a free email validation API that helps developers verify email addresses and block disposable or temporary emails in real-time.

## Data

- Freshness: stored
- What it checks: format, mail servers, disposable domains, role addresses
- Keep data: no limit
- Use data: You agree not to use the Service for any unlawful purpose or in any way that could damage, disable, or impair the Service. Specifically, you agree not to: Abuse the Service or use it in a way that negatively impacts other users, Attempt to gain unauthorized access to any part of the Service, Use automated scripts or bots to interact with the Service in an abusive manner, Use the Service for illegal activities, Circumvent any limitations or restrictions placed on your account, Create multiple accounts to bypass free tier limitations, Resell or redistribute the Service without authorization

## Plan

- Pay: $0
- You get: 1,000 requests a month
- Enough for: 1,000 calls a month

## Rate limit

- Batch: 1

## Speed

- Answer: in the call

## The call

- You send: one of email or domain
- Method: POST
- Path: /v2/

## About the plan

- Plan: Free forever
- Who can get it: anyone

## The 31 fields the plan's answer can hold

valid, block, domain, base domain, text, reason, risk, disposable, email forwarder, public free provider, public premium provider, business provider, ISP email, email API, web hosting email, self-hosted, parked, role-based email, MX host, MX IP, MX info, MX fallback, MX hosts, MX IPs, MX priorities, email provider, disposable provider, possible typo, domain age days, domain created at, block status changed at

## Check Mail's plans (3)

- [Check Mail, free](https://datacircle.dev/validate-email-apis/check-mail/free/llms.txt): $0.00 per 1,000, 50% complete, stored
- [Check Mail, $50 monthly](https://datacircle.dev/validate-email-apis/check-mail/50-monthly/llms.txt): $0.25 per 1,000, 50% complete, stored
- [Check Mail, $99 monthly](https://datacircle.dev/validate-email-apis/check-mail/99-monthly/llms.txt): $0.198 per 1,000, 50% complete, stored

## Check Mail's calls (1)

- `POST /v2/`: [Check Mail, free](https://datacircle.dev/validate-email-apis/check-mail/free/llms.txt)

## Check Mail's APIs (1)

- [Check Mail: email verification API pricing, 3 plans](https://datacircle.dev/validate-email-apis/check-mail/free/llms.txt)

## Check Mail: email verification API alternatives

- [Elastic Email, $999 monthly, Email API Pro (5,000,000 emails/month), POST /verifications/files](https://datacircle.dev/validate-email-apis/elastic-email/999-monthly-email-api-pro-5000000-emails-month-post-verifications-files/llms.txt): $0.20 per 1,000, 50% complete, stored
- [Signaliz, top-up](https://datacircle.dev/validate-email-apis/signaliz/top-up/llms.txt): $0.20 per 1,000, 33% complete, stored
- [StopReg, $100 monthly](https://datacircle.dev/validate-email-apis/stopreg/100-monthly/llms.txt): $0.20 per 1,000, 50% complete, stored
- [UserCheck, $100 monthly, Pro 500k, POST /v1/gates/{gate_id}/decisions, Decision endpoint](https://datacircle.dev/validate-email-apis/usercheck/100-monthly-pro-500k-post-v1-gates-gate-id-decisions-decision-endpoint/llms.txt): $0.20 per 1,000, 50% complete, stored

## 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.

- https://check-mail.org?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://check-mail.org/free-email-validation-api?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://check-mail.org/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://check-mail.org/terms?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://docs.check-mail.org/api-and-authentication?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://docs.check-mail.org/faq?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://docs.check-mail.org/json-response?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing