The MailboxValidator Free Email Checker checks if a single email address is from a free email provider and returns the results in either JSON or XML format. Refer to https://www.mailboxvalidator.com/api-email-freem for further information.
https://api.mailboxvalidator.com/
Auth type
OAuth 2.0
Auth header
Authorization: Bearer YOUR_ACCESS_TOKEN
Rate limit
4,000 API calls/min (authenticated)
Pricing
Free tier available
Free quota
10 GB storage / forever
Documentation
https://api.mailboxvalidator.com/
Endpoint status
Live — HTTP 200 — endpoint is accessible7.86s
(checked Mar 29, 2026)
Builder score
C
53%
builder-friendly
OAuth 2.0 or JWT (Server Authentication) for machine-to-machine
Authorization: Bearer YOUR_ACCESS_TOKEN
| Plan | Price/mo | Included |
|---|---|---|
| Individual | Free | 10 GB storage |
| Business Starter | $15 | Per user/mo, unlimited storage |
| Business | $20 | Per user/mo, advanced admin |
| Enterprise | $0 | Custom pricing |
Individual: free (10GB). Business Starter: $15/user/mo (unlimited storage). Business: $20/user/mo. Enterprise: custom.
| Method | Path | Description |
|---|---|---|
| GET | /v1/email/free |
The Free Email Checker API does validation on a single email address and returns |
curl -X GET 'https://api.mailboxvalidator.com//v1/email/free' \ -H '# No auth required'
{}
Data sourced from API Map. Always verify pricing and rate limits against the official MailboxValidator Free Email Checker documentation.