# MailboxValidator, free, API-FREE: Email validation API

> The Single Email Validation API does validation on a single email address to help you eliminate invalid and unreachable email addresses. It checks for email syntax, MX record, MX server connection, email greylisting, free email, disposable email, suppressed email, role email, high risk email, catch-all email and so on. See immediate results for your email validation.

MailboxValidator's email validation API on its API-FREE plan, $0.00 per 1,000 emails. 4 of the 6 key fields: Address, Its check, Confidence, Company.

- This page: https://datacircle.dev/validate-email-apis/mailboxvalidator/free-api-free
- Get it: https://www.mailboxvalidator.com/plans
- Its API docs: https://www.mailboxvalidator.com/api-single-validation
- Sold by: MailboxValidator (https://www.mailboxvalidator.com)
- Checked: 2026-10-19

## In the answer

- Completeness: 67%
- Address: ✓
- Its check: ✓
- Confidence: ✓
- Company: ✓

## Price

- $ per 1,000: $0.00
- Billing: free

## Aggregators

- Aggregators: none

## Charges

- Per: call
- Also pays for: from the same budget: Disposable Email API · Free Email API

## Not found

- $ per 1,000: $0.00

## In their words

- Their pitch: The Single Email Validation API does validation on a single email address to help you eliminate invalid and unreachable email addresses. It checks for email syntax, MX record, MX server connection, email greylisting, free email, disposable email, suppressed email, role email, high risk email, catch-all email and so on. See immediate results for your email validation.

## Data

- Freshness: live
- Keep data: no limit
- Use data: MailboxValidator grants a non-sublicensable, non-exclusive, non-transferable right to access and use the Services for internal business purposes. [...] No portion of the MailboxValidator Services may be copied, reproduced, modified, published, uploaded, posted, transmitted or distributed in any way without MailboxValidator prior written permission. [...] Except as expressly permitted in this Terms of Service, Users may not, nor may Users permit others to: allow anyone other than Users or Users' employees to use the MailboxValidator Services, or any portion thereof, without MailboxValidator express written permission, use the MailboxValidator Services to develop a similar services, or other information resource in any media for sale to, distribute to, display to or use by others, create compilations or derivative works of the MailboxValidator Services, [...] store in retrieval system accessible to the public, transfer, publish, distribute, display to others, broadcast, rent, lease, assign, sell, or sub-license the MailboxValidator Services, or any portion thereof unless expressly permitted under this Terms of Service, [...] use MailboxValidator Services for any unlawful purpose [...] The Users agrees not to intentionally disclose or intentionally make available to any third party information received from MailboxValidator in any form without the express written approval of MailboxValidator. [...] You agree not to: [...] Use the Services to dispatch unsolicited emails, or perform email spamming (junk mail or chain letters).

## Plan

- Pay: $0
- You get: 300 credits a month
- Enough for: 300 calls a month
- Expires: 30 days

## Rate limit

- Batch: 1

## Speed

- Answer: in the call

## The call

- You send: email
- Method: GET
- Path: /validation/single

## About the plan

- Plan: API-FREE
- Who can get it: anyone

## The 24 fields the plan's answer can hold

email address, base email address, domain, free email, syntax valid, MX found, SMTP server reachable, mailbox exists, mail server down, greylisted, disposable, suppressed, role address, high risk keywords, catch-all, DMARC enforced, SPF strict, website exists, score, time taken, status, credits available, error code, error message

## MailboxValidator's plans (6)

- [MailboxValidator, free, API-FREE](https://datacircle.dev/validate-email-apis/mailboxvalidator/free-api-free/llms.txt): $0.00 per 1,000, 67% complete, live
- [MailboxValidator, free, API-FREE+](https://datacircle.dev/validate-email-apis/mailboxvalidator/free-api-free-2/llms.txt): $0.00 per 1,000, 67% complete, live
- [MailboxValidator, $29.95 monthly](https://datacircle.dev/validate-email-apis/mailboxvalidator/29-95-monthly/llms.txt): $9.983 per 1,000, 67% complete, live
- [MailboxValidator, $69.95 monthly](https://datacircle.dev/validate-email-apis/mailboxvalidator/69-95-monthly/llms.txt): $4.663 per 1,000, 67% complete, live
- [MailboxValidator, $139.95 monthly](https://datacircle.dev/validate-email-apis/mailboxvalidator/139-95-monthly/llms.txt): $1.866 per 1,000, 67% complete, live
- [MailboxValidator, $339.95 monthly](https://datacircle.dev/validate-email-apis/mailboxvalidator/339-95-monthly/llms.txt): $0.906 per 1,000, 67% complete, live

## MailboxValidator's calls (1)

- `GET /validation/single`: [MailboxValidator, free, API-FREE](https://datacircle.dev/validate-email-apis/mailboxvalidator/free-api-free/llms.txt)

## Similar plans of other providers

- [MailerCheck, free, 10 free credits, PUT /lists/{id}/verify](https://datacircle.dev/validate-email-apis/mailercheck/free-10-free-credits-put-lists-id-verify/llms.txt): $0.00 per 1,000, 50% complete, live
- [Melissa, free, Monthly Top-off, GET /V4/WEB/GlobalEmail/doGlobalEmail](https://datacircle.dev/validate-email-apis/melissa/free-monthly-top-off-get-v4-web-globalemail-doglobalemail/llms.txt): $0.00 per 1,000, 50% complete, live
- [Minelead, free](https://datacircle.dev/validate-email-apis/minelead/free/llms.txt): $0.00 per 1,000, 50% complete, live
- [MailValidation.io, free, Free, POST /api/validate/](https://datacircle.dev/validate-email-apis/mailvalidation-io/free-free-post-api-validate/llms.txt): $0.00 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 2026-10-19.

- https://github.com/MailboxValidator/mailboxvalidator-openapi/blob/main/yaml/SingleEmailValidation.yaml
- https://www.mailboxvalidator.com/api-email-disposable
- https://www.mailboxvalidator.com/api-email-free
- https://www.mailboxvalidator.com/api-single-validation
- https://www.mailboxvalidator.com/faqs
- https://www.mailboxvalidator.com/plans
- https://www.mailboxvalidator.com/resources/articles/introduction-to-mailboxvalidator-api/
- https://www.mailboxvalidator.com/resources/articles/to-reduce-bounce-use-the-bulk-or-the-api/
- https://www.mailboxvalidator.com/terms-of-service
- https://www.mailboxvalidator.com/web-service