# MailingAPI, free, First 1,000, POST /v1/validate/single: Email verification API

> Email validation catches invalid addresses before you send, protecting your sender reputation and reducing bounces.

MailingAPI's email verification API on its "First 1,000" plan. It costs $0.00 per 1,000 emails. It returns 2 of the 6 key fields we check: Address, Deliverability.
In [our email verification API benchmark](https://datacircle.dev/best-email-verification-api.txt), the best plan from MailingAPI scores 45.6 out of 100. MailingAPI ranks 96th of 189 providers.
This plan is free. We rank 3,886 plans for email verification APIs by price. Half the plans cost $1.998 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.
[email-validation.org](https://datacircle.dev/validate-email-apis/email-validation-org/450-pack-1000000-credits-post-v1-validate/llms.txt), [pingutil](https://datacircle.dev/validate-email-apis/pingutil/free-api-key-post-v1-verify/llms.txt) and [MailTester Ninja](https://datacircle.dev/validate-email-apis/mailtester-ninja/23-99-monthly/llms.txt) are the best email verification API providers in the Datacircle benchmark.

- This page: https://datacircle.dev/validate-email-apis/mailingapi/free-first-1000-post-v1-validate-single
- [Email validation API: 180+ verification providers compared](https://datacircle.dev/best-email-verification-api.txt)
- Get it: https://mailingapi.com/docs/validation?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- Request: `POST https://api.mailingapi.com/v1/validate/single`
- API key: with the plan, on https://mailingapi.com/docs/validation?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- Its API docs: https://mailingapi.com/docs/validation?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- Sold by: MailingAPI (https://mailingapi.com?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing)
- Checked: 2026-11-03

## In the answer

- Completeness: 33%
- Address: ✓
- Deliverability: ✓

## Price

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

## Aggregators

- Aggregators: none

## Charges

- Also pays for: from the same budget: Batch validation

## Not found

- $ per 1,000: $0.00

## Catch-all

- $ per 1,000: $0.00

## In their words

- Their pitch: Email validation catches invalid addresses before you send, protecting your sender reputation and reducing bounces.

## Data

- Freshness: live
- What it checks: format, mail servers, disposable domains, role addresses, mailbox
- Keep data: no limit
- Use data: 3.2 Dozwolone użycie: Usługa jest przeznaczona wyłącznie do wysyłania: Emaili transakcyjnych (potwierdzenia, powiadomienia), Emaili marketingowych do odbiorców, którzy wyrazili zgodę, Komunikacji zgodnej z prawem i polityką anti-spam. 3.3 Zabronione użycie: Zabrania się używania Usługi do: Wysyłania spamu lub niezamówionych wiadomości masowych, Phishingu lub innych oszustw, Rozpowszechniania złośliwego oprogramowania, Naruszania praw osób trzecich, Działań niezgodnych z prawem

## Plan

- Pay: $0
- You get: 1,000 requests
- Enough for: 1,000 calls

## Rate limit

- Per second: 10
- Batch: 1

## Speed

- Answer: in the call
- Median: 1.18 s

## The call

- You send: email. Optional: include_engagement, skip_catchall, skip_mx, skip_smtp
- Method: POST
- Path: /v1/validate/single

## About the plan

- Plan: First 1,000
- Who can get it: anyone

## The 16 fields the plan's answer can hold

email address, valid, deliverable, reason, risk level, suggestion, validated at, syntax check, MX check, SMTP check, disposable, role, catch-all, suppressed, engagement grade, engagement score

## MailingAPI's plans (4)

- [MailingAPI, free, First 1,000, POST /v1/validate/single](https://datacircle.dev/validate-email-apis/mailingapi/free-first-1000-post-v1-validate-single/llms.txt): $0.00 per 1,000, 33% complete, live
- [MailingAPI, pay as you go, 1,001 - 10,000, POST /v1/validate/single](https://datacircle.dev/validate-email-apis/mailingapi/pay-as-you-go-1001-10000-post-v1-validate-single/llms.txt): $5.00 per 1,000, 33% complete, live
- [MailingAPI, pay as you go, 10,001 - 100,000, POST /v1/validate/single](https://datacircle.dev/validate-email-apis/mailingapi/pay-as-you-go-10001-100000-post-v1-validate-single/llms.txt): $3.00 per 1,000, 33% complete, live
- [MailingAPI, pay as you go, 100,001+, POST /v1/validate/single](https://datacircle.dev/validate-email-apis/mailingapi/pay-as-you-go-100001-post-v1-validate-single/llms.txt): $1.00 per 1,000, 33% complete, live

## MailingAPI's calls (2)

- `POST /v1/validate/batch`: [MailingAPI, free, First 1,000, POST /v1/validate/batch](https://datacircle.dev/validate-email-apis/mailingapi/free-first-1000-post-v1-validate-batch/llms.txt)
- `POST /v1/validate/single`: [MailingAPI, free, First 1,000, POST /v1/validate/single](https://datacircle.dev/validate-email-apis/mailingapi/free-first-1000-post-v1-validate-single/llms.txt)

## MailingAPI's APIs (1)

- [MailingAPI: email verification API pricing, 4 plans, POST /v1/validate/single](https://datacircle.dev/validate-email-apis/mailingapi/free-first-1000-post-v1-validate-single/llms.txt)

## MailingAPI: email verification API alternatives

- [BillionVerify, $20 pack, Starter, POST /verify/bulk](https://datacircle.dev/validate-email-apis/billionverify/20-pack-starter-post-verify-bulk/llms.txt): $1.00 per 1,000, 67% complete, live
- [Verimail, $100 pack](https://datacircle.dev/validate-email-apis/verimail/100-pack/llms.txt): $1.00 per 1,000, 50% complete, live
- [Listclean, $5 pack, 5K Credits, GET /verify/email/{email}](https://datacircle.dev/validate-email-apis/listclean/5-pack-5k-credits-get-verify-email-email/llms.txt): $1.00 per 1,000, 33% complete, live
- [MillionPhones, $100 monthly](https://datacircle.dev/validate-email-apis/millionphones/100-monthly/llms.txt): $1.00 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 2026-11-03.

- https://api.mailingapi.com/api/openapi?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://mailingapi.com/api/docs?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://mailingapi.com/docs/validation?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://mailingapi.com/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://mailingapi.com/terms?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing