# MailerCheck, free, 10 free credits, POST /check/single-async: Email validation API

> MailerCheck’s email validation API verifies new email addresses as you collect them and instantly filters out emails with typos, errors, catch-all domains and more.

MailerCheck's email validation API on its 10 free credits plan, $0.00 per 1,000 emails. 2 of the 6 key fields: Its check, Place.

- This page: https://datacircle.dev/validate-email-apis/mailercheck/free-10-free-credits-post-check-single-async
- Get it: https://www.mailercheck.com/pricing
- Its API docs: https://developers.mailercheck.com/email#single-email-verification-async
- Sold by: MailerCheck (https://www.mailercheck.com)
- Checked: 2026-10-19

## In the answer

- Completeness: 33%
- Its check: ✓
- Place: ✓

## Price

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

## Aggregators

- Aggregators: none

## Charges

- Per: call
- Also pays for: from the same budget: Single email verification · List verification · Email Insights · Inbox Placement

## Not found

- $ per 1,000: $0.00

## In their words

- Their pitch: MailerCheck’s email validation API verifies new email addresses as you collect them and instantly filters out emails with typos, errors, catch-all domains and more.

## Data

- Freshness: live
- Keep data: no limit
- Use data: use the Services solely for purposes relating to your trade, business, craft, or profession [...] the Services are strictly for commercial use and that you are not authorized to use the Services for personal, family, or household purposes [...] You must not use this website in any way that causes or may cause damage to MailerCheck or any other party, or in any way which is illegal, fraudulent, harmful or unlawful

## Plan

- Pay: $0
- You get: 10 credits
- Enough for: 10 calls, once
- Expires: never

## Rate limit

- Per second: 1
- Batch: 1

## Speed

- Answer: by polling

## The call

- You send: email
- Method: POST
- Path: /check/single-async

## About the plan

- Plan: 10 free credits
- Who can get it: anyone who is at least 18, uses it for their trade, business, craft or profession, and is not registered in a country or region sanctioned by the United States, United Kingdom, European Union or United Nations

## The 4 fields the plan's answer can hold

verification ID, state, errors, result

## MailerCheck's plans (18)

- [MailerCheck, free, 10 free credits, POST /check/single-async](https://datacircle.dev/validate-email-apis/mailercheck/free-10-free-credits-post-check-single-async/llms.txt): $0.00 per 1,000, 33% complete, live
- [MailerCheck, $10 pack, Pay as you go, 1,000 credits, POST /check/single-async](https://datacircle.dev/validate-email-apis/mailercheck/10-pack-pay-as-you-go-1000-credits-post-check-single-async/llms.txt): $10.00 per 1,000, 33% complete, live
- [MailerCheck, $25 pack, Pay as you go, 2,500 credits, POST /check/single-async](https://datacircle.dev/validate-email-apis/mailercheck/25-pack-pay-as-you-go-2500-credits-post-check-single-async/llms.txt): $10.00 per 1,000, 33% complete, live
- [MailerCheck, $45 pack, Pay as you go, 5,000 credits, POST /check/single-async](https://datacircle.dev/validate-email-apis/mailercheck/45-pack-pay-as-you-go-5000-credits-post-check-single-async/llms.txt): $9.00 per 1,000, 33% complete, live
- [MailerCheck, $80 pack, Pay as you go, 10,000 credits, POST /check/single-async](https://datacircle.dev/validate-email-apis/mailercheck/80-pack-pay-as-you-go-10000-credits-post-check-single-async/llms.txt): $8.00 per 1,000, 33% complete, live
- [MailerCheck, $120 pack, Pay as you go, 15,000 credits, POST /check/single-async](https://datacircle.dev/validate-email-apis/mailercheck/120-pack-pay-as-you-go-15000-credits-post-check-single-async/llms.txt): $8.00 per 1,000, 33% complete, live
- [MailerCheck, $160 pack, Pay as you go, 20,000 credits, POST /check/single-async](https://datacircle.dev/validate-email-apis/mailercheck/160-pack-pay-as-you-go-20000-credits-post-check-single-async/llms.txt): $8.00 per 1,000, 33% complete, live
- [MailerCheck, $175 pack, Pay as you go, 25,000 credits, POST /check/single-async](https://datacircle.dev/validate-email-apis/mailercheck/175-pack-pay-as-you-go-25000-credits-post-check-single-async/llms.txt): $7.00 per 1,000, 33% complete, live
- [MailerCheck, $300 pack, Pay as you go, 50,000 credits, POST /check/single-async](https://datacircle.dev/validate-email-apis/mailercheck/300-pack-pay-as-you-go-50000-credits-post-check-single-async/llms.txt): $6.00 per 1,000, 33% complete, live
- [MailerCheck, $450 pack, Pay as you go, 75,000 credits, POST /check/single-async](https://datacircle.dev/validate-email-apis/mailercheck/450-pack-pay-as-you-go-75000-credits-post-check-single-async/llms.txt): $6.00 per 1,000, 33% complete, live
- [MailerCheck, $500 pack, Pay as you go, 100,000 credits, POST /check/single-async](https://datacircle.dev/validate-email-apis/mailercheck/500-pack-pay-as-you-go-100000-credits-post-check-single-async/llms.txt): $5.00 per 1,000, 33% complete, live
- [MailerCheck, $750 pack, Pay as you go, 150,000 credits, POST /check/single-async](https://datacircle.dev/validate-email-apis/mailercheck/750-pack-pay-as-you-go-150000-credits-post-check-single-async/llms.txt): $5.00 per 1,000, 33% complete, live
- [MailerCheck, $1,000 pack, Pay as you go, 200,000 credits, POST /check/single-async](https://datacircle.dev/validate-email-apis/mailercheck/1000-pack-pay-as-you-go-200000-credits-post-check-single-async/llms.txt): $5.00 per 1,000, 33% complete, live
- [MailerCheck, $1,200 pack, Pay as you go, 300,000 credits, POST /check/single-async](https://datacircle.dev/validate-email-apis/mailercheck/1200-pack-pay-as-you-go-300000-credits-post-check-single-async/llms.txt): $4.00 per 1,000, 33% complete, live
- [MailerCheck, $1,500 pack, Pay as you go, 500,000 credits, POST /check/single-async](https://datacircle.dev/validate-email-apis/mailercheck/1500-pack-pay-as-you-go-500000-credits-post-check-single-async/llms.txt): $3.00 per 1,000, 33% complete, live
- [MailerCheck, $2,000 pack, Pay as you go, 1,000,000 credits, POST /check/single-async](https://datacircle.dev/validate-email-apis/mailercheck/2000-pack-pay-as-you-go-1000000-credits-post-check-single-async/llms.txt): $2.00 per 1,000, 33% complete, live
- [MailerCheck, $2,000 pack, Pay as you go, 2,000,000 credits, POST /check/single-async](https://datacircle.dev/validate-email-apis/mailercheck/2000-pack-pay-as-you-go-2000000-credits-post-check-single-async/llms.txt): $1.00 per 1,000, 33% complete, live
- [MailerCheck, $5,000 pack, Pay as you go, 5,000,000 credits, POST /check/single-async](https://datacircle.dev/validate-email-apis/mailercheck/5000-pack-pay-as-you-go-5000000-credits-post-check-single-async/llms.txt): $1.00 per 1,000, 33% complete, live

## MailerCheck's calls (3)

- `PUT /lists/{id}/verify`: [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)
- `POST /check/single`: [MailerCheck, free, 10 free credits, POST /check/single](https://datacircle.dev/validate-email-apis/mailercheck/free-10-free-credits-post-check-single/llms.txt)
- `POST /check/single-async`: [MailerCheck, free, 10 free credits, POST /check/single-async](https://datacircle.dev/validate-email-apis/mailercheck/free-10-free-credits-post-check-single-async/llms.txt)

## Similar plans of other providers

- [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
- [MyEmailVerifier, free, 100 free credits daily, GET /verifier/validate_single/{email}/{API_KEY}](https://datacircle.dev/validate-email-apis/myemailverifier/free-100-free-credits-daily-get-verifier-validate-single-email-api-key/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://developers.mailercheck.com/
- https://developers.mailercheck.com/email
- https://www.mailercheck.com/features/real-time-api-verification
- https://www.mailercheck.com/help/mailercheck-user-guide/buying-credits
- https://www.mailercheck.com/help/mailercheck-user-guide/list-verification
- https://www.mailercheck.com/help/mailercheck-user-guide/single-address-verification
- https://www.mailercheck.com/legal/terms-of-use
- https://www.mailercheck.com/pricing