# MailCheck, free: Email verification API

> Catch invalid email addresses before they bounce. Fast, accurate, GDPR compliant.

MailCheck's email verification API on its Free plan. It costs $0.00 per 1,000 emails. It returns 3 of the 6 key fields we check: Address, Deliverability, Confidence.
In [our email verification API benchmark](https://datacircle.dev/best-email-verification-api.txt), the best plan from MailCheck scores 0.0 out of 100. MailCheck ranks 162nd of 181 providers.
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/free
- [Email validation API: 180+ verification providers compared](https://datacircle.dev/best-email-verification-api.txt)
- Get it: https://mailcheck.dev/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- Request: `POST https://api.mailcheck.dev/v1/verify`
- API key: with the plan, on https://mailcheck.dev/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- Its API docs: https://api.mailcheck.dev/docs?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- Sold by: MailCheck (https://mailcheck.dev?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing)
- Checked: 2026-11-02

## In the answer

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

## Price

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

## Aggregators

- Aggregators: none

## Overage

- Units cap: hard

## Not found

- $ per 1,000: $0.00

## In their words

- Their pitch: Catch invalid email addresses before they bounce. Fast, accurate, GDPR compliant.

## Data

- What it checks: format, mail servers, disposable domains, role addresses
- Keep data: no limit
- Use data: You agree not to use MailCheck to: Send spam or unsolicited communications, Harvest or collect email addresses for unauthorized purposes, Attempt to circumvent rate limits or usage quotas, Interfere with or disrupt the service or its infrastructure, Use the service for any illegal or fraudulent activity, Reverse-engineer, decompile, or attempt to extract source code, Resell or redistribute the service without written permission

## Plan

- Pay: €0
- You get: 100 credits a month
- Enough for: 100 calls a month

## Rate limit

- Batch: 1

## Speed

- Answer: in the call

## The call

- You send: email
- Method: POST
- Path: /v1/verify

## About the plan

- Plan: Free
- Who can get it: anyone aged 18 or over, or with the legal capacity to enter into the terms

## The 18 fields the plan's answer can hold

email address, valid, score, reason, syntax, disposable, MX record, SMTP, role, free provider, MX host, free provider name, typo suggestion, has typo suggestion, risk level, catch-all, cached, credits remaining

## MailCheck's plans (4)

- [MailCheck, free](https://datacircle.dev/validate-email-apis/mailcheck/free/llms.txt): $0.00 per 1,000, 50% complete
- [MailCheck, €9 monthly](https://datacircle.dev/validate-email-apis/mailcheck/9-monthly/llms.txt): $2.026 per 1,000, 50% complete
- [MailCheck, €19 monthly, Pro, POST /v1/verify](https://datacircle.dev/validate-email-apis/mailcheck/19-monthly-pro-post-v1-verify/llms.txt): $0.855 per 1,000, 50% complete
- [MailCheck, contact us, Enterprise, POST /v1/verify](https://datacircle.dev/validate-email-apis/mailcheck/contact-us-enterprise-post-v1-verify/llms.txt): 50% complete

## MailCheck's calls (2)

- `POST /v1/verify`: [MailCheck, free](https://datacircle.dev/validate-email-apis/mailcheck/free/llms.txt)
- `POST /v1/verify/bulk`: [MailCheck, €19 monthly, Pro, POST /v1/verify/bulk](https://datacircle.dev/validate-email-apis/mailcheck/19-monthly-pro-post-v1-verify-bulk/llms.txt)

## MailCheck's APIs (1)

- [MailCheck: email verification API pricing, 4 plans](https://datacircle.dev/validate-email-apis/mailcheck/free/llms.txt)

## MailCheck: email verification API alternatives

- [HeroBounce, $17 monthly, Starter, POST /validation/single](https://datacircle.dev/validate-email-apis/herobounce/17-monthly-starter-post-validation-single/llms.txt): $0.85 per 1,000, 67% complete, live
- [SafetyMails, $9,240 yearly](https://datacircle.dev/validate-email-apis/safetymails/9240-yearly/llms.txt): $0.856 per 1,000, 33% complete, live
- [Bounceless, $429 pack, 500,000 credit pack, POST /v1/requests, Create a batch (emails)](https://datacircle.dev/validate-email-apis/bounceless/429-pack-500000-credit-pack-post-v1-requests-500000-credits/llms.txt): $0.858 per 1,000, 50% complete, live
- [ListWise, $860 monthly, Monthly 1 Million, GET /clean/deep.php](https://datacircle.dev/validate-email-apis/listwise/860-monthly-monthly-1-million-get-clean-deep-php/llms.txt): $0.86 per 1,000, 33% 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 2026-11-02.

- https://api.mailcheck.dev/docs?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://api.mailcheck.dev/privacy?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://api.mailcheck.dev/terms?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://mailcheck.dev/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing