# MailProbe, free: Email verification API

> Paste a list, upload a CSV, or call the API from your backend. Every check runs syntax, MX records and a real SMTP mailbox probe, in France.

MailProbe's email verification API on its Free Tier plan. It costs $0.00 per 1,000 emails. It returns 3 of the 6 key fields we check: Address, Deliverability, Confidence.
We rank 2,458 plans by price. [treg's top-up from $10](https://datacircle.dev/validate-email-apis/treg/top-up-from-10/llms.txt) costs the least per 1,000 emails: $0.00 on average. treg asks one provider after another until one answers. You pay $26.95 per 1,000 emails when no provider answers.
[Enrich.so](https://datacircle.dev/validate-email-apis/enrich-so/149-monthly/llms.txt), [GetProspect](https://datacircle.dev/validate-email-apis/getprospect/369-pack/llms.txt) and [treg](https://datacircle.dev/validate-email-apis/treg/top-up-from-10/llms.txt) are the best email verification API providers in our benchmark.

- This page: https://datacircle.dev/validate-email-apis/mailprobe/free
- [Best email verification API in 2026](https://datacircle.dev/best-email-verification-api.txt)
- Get it: https://mailprobe.dev/pricing/
- Request: `POST https://mailprobe.dev/api/v1/verify`
- API key: with the plan, on https://mailprobe.dev/pricing/
- Its API docs: https://mailprobe.dev/api-docs/
- Sold by: MailProbe (https://mailprobe.dev)
- Checked: 2026-10-28

## In the answer

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

## Price

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

## Aggregators

- Aggregators: none

## Charges

- Also pays for: nothing else

## Overage

- Units cap: hard

## Not found

- $ per 1,000: $0.00

## Catch-all

- $ per 1,000: $0.00

## In their words

- Their pitch: Paste a list, upload a CSV, or call the API from your backend. Every check runs syntax, MX records and a real SMTP mailbox probe, in France.

## Data

- Freshness: live
- What it checks: format, mail servers, disposable domains, role addresses, mailbox
- Keep data: no limit
- Use data: You agree not to: Use the service for spamming, phishing, or any illegal activity. Attempt to circumvent rate limits or abuse the API. Resell API access without prior written consent. Use the service to validate email lists obtained without consent.

## Plan

- Pay: $0
- You get: 100 credits
- Enough for: 100 results, once

## Rate limit

- Per second: 1
- Batch: 20

## Speed

- Answer: in the call
- Median: 0.23 s

## The call

- You send: emails. Optional: timeout
- Method: POST
- Path: /api/v1/verify

## About the plan

- Plan: Free Tier
- Who can get it: anyone with a new account (one account per person or organization)

## The 17 fields the plan's answer can hold

email, result, status, score, catch-all, reason, retry after, SMTP code, SMTP enhanced code, syntax, MX found, SMTP check, disposable, role-based, free provider, did you mean, MX records

## MailProbe's plans (5)

- [MailProbe, free](https://datacircle.dev/validate-email-apis/mailprobe/free/llms.txt): $0.00 per 1,000, 50% complete, live
- [MailProbe, $5 pack](https://datacircle.dev/validate-email-apis/mailprobe/5-pack/llms.txt): $5.00 per 1,000, 50% complete, live
- [MailProbe, $20 pack](https://datacircle.dev/validate-email-apis/mailprobe/20-pack/llms.txt): $2.00 per 1,000, 50% complete, live
- [MailProbe, $90 pack](https://datacircle.dev/validate-email-apis/mailprobe/90-pack/llms.txt): $1.80 per 1,000, 50% complete, live
- [MailProbe, $150 pack](https://datacircle.dev/validate-email-apis/mailprobe/150-pack/llms.txt): $1.50 per 1,000, 50% complete, live

## MailProbe's calls (1)

- `POST /api/v1/verify`: [MailProbe, free](https://datacircle.dev/validate-email-apis/mailprobe/free/llms.txt)

## MailProbe's APIs (1)

- [MailProbe: email verification API pricing, 5 plans](https://datacircle.dev/validate-email-apis/mailprobe/free/llms.txt)

## MailProbe: email verification API alternatives

- [Sealch, $15 pack, Pay as you go 10,000 emails, POST /api/verify](https://datacircle.dev/validate-email-apis/sealch/15-pack-pay-as-you-go-10000-emails-post-api-verify/llms.txt): $1.50 per 1,000, 17% complete, live
- [Verimail, $15 monthly](https://datacircle.dev/validate-email-apis/verimail/15-monthly/llms.txt): $1.50 per 1,000, 50% complete, live
- [DeBounce, top-up from $75, 50K credits, GET /v1/, Single email validation](https://datacircle.dev/validate-email-apis/debounce/top-up-from-75-50k-credits-get-v1/llms.txt): $1.50 per 1,000, 50% complete, live
- [NullBounce, $15 pack](https://datacircle.dev/validate-email-apis/nullbounce/15-pack/llms.txt): $1.50 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 2026-10-28.

- https://mailprobe.dev/
- https://mailprobe.dev/api-docs/
- https://mailprobe.dev/legal/
- https://mailprobe.dev/openapi.json
- https://mailprobe.dev/pricing/
- https://mailprobe.dev/terms/