# CheckMail1, free, POST /verify/batch: Email verification API

> Verify any email instantly — Gmail, iCloud, QQ, Yahoo and 50+ providers. Powered by direct API checks, not SMTP guessing.

CheckMail1'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 CheckMail1 scores 0.0 out of 100. CheckMail1 ranks 142nd 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/checkmail1/free-post-verify-batch
- [Email validation API: 180+ verification providers compared](https://datacircle.dev/best-email-verification-api.txt)
- Get it: https://checkmail1.com?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- Request: `POST https://checkmail1.com/api/verify/batch`
- API key: with the plan, on https://checkmail1.com?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- Its API docs: https://checkmail1.com/docs.html?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- Sold by: CheckMail1 (https://checkmail1.com?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: result
- Billing: free

## Aggregators

- Aggregators: none

## Charges

- Also pays for: from the same budget: Single Email Verification

## Overage

- Units cap: hard

## Not found

- $ per 1,000: $0.00

## In their words

- Their pitch: Verify any email instantly — Gmail, iCloud, QQ, Yahoo and 50+ providers. Powered by direct API checks, not SMTP guessing.

## Data

- Freshness: live
- What it checks: format, mail servers, disposable domains, mailbox
- Keep data: no limit
- Use data: You agree to use the Service only for lawful purposes. You must not: Use the Service to send spam or unsolicited communications, Attempt to reverse-engineer or scrape our systems, Resell access to the Service without written permission, Use the Service to verify emails for malicious purposes, Violate any applicable laws or regulations, Attempt to circumvent rate limits or security measures

## Plan

- Pay: $0
- You get: 100 credits
- Enough for: 100 results
- Expires: never

## Rate limit

- Per second: 1
- Concurrent: 10

## Speed

- Answer: in the call

## The call

- You send: emails
- Method: POST
- Path: /verify/batch

## About the plan

- Plan: Free
- Who can get it: anyone

## The 6 fields the plan's answer can hold

email address, status, valid, score, count, credits remaining

## CheckMail1's plans (7)

- [CheckMail1, free, POST /verify/batch](https://datacircle.dev/validate-email-apis/checkmail1/free-post-verify-batch/llms.txt): $0.00 per 1,000, 50% complete, live
- [CheckMail1, $1 pack, Trial, POST /verify/batch](https://datacircle.dev/validate-email-apis/checkmail1/1-pack-trial-post-verify-batch/llms.txt): $10.00 per 1,000, 50% complete, live
- [CheckMail1, $5 pack, Starter, POST /verify/batch](https://datacircle.dev/validate-email-apis/checkmail1/5-pack-starter-post-verify-batch/llms.txt): $5.00 per 1,000, 50% complete, live
- [CheckMail1, $12 pack, Basic, POST /verify/batch](https://datacircle.dev/validate-email-apis/checkmail1/12-pack-basic-post-verify-batch/llms.txt): $4.00 per 1,000, 50% complete, live
- [CheckMail1, $29 pack, Pro, POST /verify/batch](https://datacircle.dev/validate-email-apis/checkmail1/29-pack-pro-post-verify-batch/llms.txt): $2.90 per 1,000, 50% complete, live
- [CheckMail1, $69 pack, Business, POST /verify/batch](https://datacircle.dev/validate-email-apis/checkmail1/69-pack-business-post-verify-batch/llms.txt): $2.30 per 1,000, 50% complete, live
- [CheckMail1, $169 pack, Enterprise, POST /verify/batch](https://datacircle.dev/validate-email-apis/checkmail1/169-pack-enterprise-post-verify-batch/llms.txt): $1.69 per 1,000, 50% complete, live

## CheckMail1's calls (2)

- `POST /verify/batch`: [CheckMail1, free, POST /verify/batch](https://datacircle.dev/validate-email-apis/checkmail1/free-post-verify-batch/llms.txt)
- `GET /verify`: [CheckMail1, free, GET /verify](https://datacircle.dev/validate-email-apis/checkmail1/free-get-verify/llms.txt)

## CheckMail1's APIs (1)

- [CheckMail1: email verification API pricing, 7 plans, POST /verify/batch](https://datacircle.dev/validate-email-apis/checkmail1/free-post-verify-batch/llms.txt)

## CheckMail1: email verification API alternatives

- [mailfloss, $3,540 yearly, Pro 175,000 credits/month, billed annually, GET /v1/verify](https://datacircle.dev/validate-email-apis/mailfloss/3540-yearly-pro-175000-credits-month-billed-annually-get-v1-verify/llms.txt): $1.686 per 1,000, 50% complete, live
- [OxiBounce, €1,499 pack, 1 000 000 vérifications, POST /list](https://datacircle.dev/validate-email-apis/oxibounce/1499-pack-1-000-000-verifications-post-list/llms.txt): $1.687 per 1,000, 50% complete, live
- [Mailthentic, $169 pack, Bulk (pay as you go), POST /api/verify/bulk](https://datacircle.dev/validate-email-apis/mailthentic/169-pack-bulk-pay-as-you-go-post-api-verify-bulk/llms.txt): $1.69 per 1,000, 67% complete, live
- [Piloterr, $10,788 yearly](https://datacircle.dev/validate-email-apis/piloterr/10788-yearly/llms.txt): $1.696 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://checkmail1.com?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://checkmail1.com/docs.html?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://checkmail1.com/privacy.html?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://checkmail1.com/refund.html?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://checkmail1.com/terms.html?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing