# Mailerio, free trial, POST /v{version}/validatelist: Email verification API

> Easily integrate a powerful email verification API into your app, form, or CRM—check emails using a real-time email validation API before they hit your list.

Mailerio's email verification API on its Free trial plan. It costs $0.00 per 1,000 emails. It returns 1 of the 6 key fields we check: Deliverability.
We rank 2,475 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/mailerio/free-trial-post-v-version-validatelist
- [Best email verification API in 2026](https://datacircle.dev/best-email-verification-api.txt)
- Get it: https://mailerio.com/pricing/
- Request: `POST https://api.mailerio.com/v{version}/validatelist`
- API key: with the plan, on https://mailerio.com/pricing/
- Its API docs: https://mailerio.com/docs/api-reference/
- Sold by: Mailerio (https://mailerio.com)
- Checked: 2026-10-28

## In the answer

- Completeness: 17%
- Deliverability: ✓

## Price

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

## Aggregators

- Aggregators: none

## Charges

- Also pays for: from the same budget: Validate a single email

## Overage

- Units cap: hard

## Not found

- $ per 1,000: $0.00

## In their words

- Their pitch: Easily integrate a powerful email verification API into your app, form, or CRM—check emails using a real-time email validation API before they hit your list.

## Data

- Freshness: live
- What it checks: format, mail servers, disposable domains, role addresses, mailbox
- Keep data: no API terms
- Use data: no API terms

## Plan

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

## Rate limit

- Batch: no limit

## Speed

- Answer: by polling or webhook

## The call

- You send: version. Optional: nothing required in the body, emails, name, whitelist, blacklist, rfc, level, callbackUrl
- Method: POST
- Path: /v{version}/validatelist

## About the plan

- Plan: Free trial
- Who can get it: anyone with a new account ("all users receive 100 free credits upon registration"), a minor needs a parent or guardian's permission

## The 27 fields the plan's answer can hold

list ID, started on, completed on, list name, download URL, list size, accept-all count, disposable count, duration, free count, mailbox full count, no-reply count, valid count, role count, average score, deliverable count, undeliverable count, risky count, unknown count, blacklisted count, whitelisted count, greylisted count, duplicate count, tag count, progress, status, reason

## Mailerio's plans (16)

- [Mailerio, free trial, POST /v{version}/validatelist](https://datacircle.dev/validate-email-apis/mailerio/free-trial-post-v-version-validatelist/llms.txt): $0.00 per 1,000, 17% complete, live
- [Mailerio, $7 pack, Pay as you go 1,000 emails, POST /v{version}/validatelist](https://datacircle.dev/validate-email-apis/mailerio/7-pack-pay-as-you-go-1000-emails-post-v-version-validatelist/llms.txt): $7.00 per 1,000, 17% complete, live
- [Mailerio, $17.50 pack, Pay as you go 5,000 emails, POST /v{version}/validatelist](https://datacircle.dev/validate-email-apis/mailerio/17-50-pack-pay-as-you-go-5000-emails-post-v-version-validatelist/llms.txt): $3.50 per 1,000, 17% complete, live
- [Mailerio, $28 pack, Pay as you go 10,000 emails, POST /v{version}/validatelist](https://datacircle.dev/validate-email-apis/mailerio/28-pack-pay-as-you-go-10000-emails-post-v-version-validatelist/llms.txt): $2.80 per 1,000, 17% complete, live
- [Mailerio, $56 pack, Pay as you go 25,000 emails, POST /v{version}/validatelist](https://datacircle.dev/validate-email-apis/mailerio/56-pack-pay-as-you-go-25000-emails-post-v-version-validatelist/llms.txt): $2.24 per 1,000, 17% complete, live
- [Mailerio, $105 pack, Pay as you go 50,000 emails, POST /v{version}/validatelist](https://datacircle.dev/validate-email-apis/mailerio/105-pack-pay-as-you-go-50000-emails-post-v-version-validatelist/llms.txt): $2.10 per 1,000, 17% complete, live
- [Mailerio, $189 pack, Pay as you go 100,000 emails, POST /v{version}/validatelist](https://datacircle.dev/validate-email-apis/mailerio/189-pack-pay-as-you-go-100000-emails-post-v-version-validatelist/llms.txt): $1.89 per 1,000, 17% complete, live
- [Mailerio, $385 pack, Pay as you go 250,000 emails, POST /v{version}/validatelist](https://datacircle.dev/validate-email-apis/mailerio/385-pack-pay-as-you-go-250000-emails-post-v-version-validatelist/llms.txt): $1.54 per 1,000, 17% complete, live
- [Mailerio, $560 pack, Pay as you go 500,000 emails, POST /v{version}/validatelist](https://datacircle.dev/validate-email-apis/mailerio/560-pack-pay-as-you-go-500000-emails-post-v-version-validatelist/llms.txt): $1.12 per 1,000, 17% complete, live
- [Mailerio, $700 pack, Pay as you go 1,000,000 emails, POST /v{version}/validatelist](https://datacircle.dev/validate-email-apis/mailerio/700-pack-pay-as-you-go-1000000-emails-post-v-version-validatelist/llms.txt): $0.70 per 1,000, 17% complete, live
- [Mailerio, $2,450 pack, Pay as you go 5,000,000 emails, POST /v{version}/validatelist](https://datacircle.dev/validate-email-apis/mailerio/2450-pack-pay-as-you-go-5000000-emails-post-v-version-validatelist/llms.txt): $0.49 per 1,000, 17% complete, live
- [Mailerio, $50 monthly, Monthly 30,000 emails, POST /v{version}/validatelist](https://datacircle.dev/validate-email-apis/mailerio/50-monthly-monthly-30000-emails-post-v-version-validatelist/llms.txt): $1.667 per 1,000, 17% complete, live
- [Mailerio, $150 monthly, Monthly 100,000 emails, POST /v{version}/validatelist](https://datacircle.dev/validate-email-apis/mailerio/150-monthly-monthly-100000-emails-post-v-version-validatelist/llms.txt): $1.50 per 1,000, 17% complete, live
- [Mailerio, $250 monthly, Monthly 250,000 emails, POST /v{version}/validatelist](https://datacircle.dev/validate-email-apis/mailerio/250-monthly-monthly-250000-emails-post-v-version-validatelist/llms.txt): $1.00 per 1,000, 17% complete, live
- [Mailerio, $350 monthly, Monthly 500,000 emails, POST /v{version}/validatelist](https://datacircle.dev/validate-email-apis/mailerio/350-monthly-monthly-500000-emails-post-v-version-validatelist/llms.txt): $0.70 per 1,000, 17% complete, live
- [Mailerio, $500 monthly, Monthly 1,000,000 emails, POST /v{version}/validatelist](https://datacircle.dev/validate-email-apis/mailerio/500-monthly-monthly-1000000-emails-post-v-version-validatelist/llms.txt): $0.50 per 1,000, 17% complete, live

## Mailerio's calls (2)

- `GET /v{version}/validate`: [Mailerio, free trial, GET /v{version}/validate](https://datacircle.dev/validate-email-apis/mailerio/free-trial-get-v-version-validate/llms.txt)
- `POST /v{version}/validatelist`: [Mailerio, free trial, POST /v{version}/validatelist](https://datacircle.dev/validate-email-apis/mailerio/free-trial-post-v-version-validatelist/llms.txt)

## Mailerio's APIs (1)

- [Mailerio: email verification API pricing, 16 plans, POST /v{version}/validatelist](https://datacircle.dev/validate-email-apis/mailerio/free-trial-post-v-version-validatelist/llms.txt)

## Mailerio: email verification API alternatives

- [Verifalia, $4,890 pack](https://datacircle.dev/validate-email-apis/verifalia/4890-pack/llms.txt): $0.489 per 1,000, 67% complete, live
- [Enrich.so, $49 monthly, Growth, POST /email-validation](https://datacircle.dev/validate-email-apis/enrich-so/49-monthly/llms.txt): $0.49 per 1,000, 50% complete, live
- [Sealch, $49 pack, Pay as you go 100,000 emails, POST /api/verify](https://datacircle.dev/validate-email-apis/sealch/49-pack-pay-as-you-go-100000-emails-post-api-verify/llms.txt): $0.49 per 1,000, 17% complete, live
- [Bulk Email Checker, $369.95 pack](https://datacircle.dev/validate-email-apis/bulk-email-checker/369-95-pack/llms.txt): $0.493 per 1,000, 50% 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://api.mailerio.com/swagger/v1/swagger.json
- https://mailerio.com/
- https://mailerio.com/api/
- https://mailerio.com/docs/api-reference/
- https://mailerio.com/pricing/
- https://mailerio.com/privacy-policy/
- https://mailerio.com/terms-and-conditions/