# MailValid, free, POST /api/v1/verify/bulk: Email verification API

> MailValid's email verification API checks syntax, DNS/MX records, and SMTP mailbox existence in a single REST call, returning a result in under 500ms.

MailValid's email verification API on its Free plan. It costs $0.00 per 1,000 emails. It returns 4 of the 6 key fields we check: Address, Deliverability, Confidence, Company.
We rank 2,467 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/mailvalid/free-post-api-v1-verify-bulk
- [Best email verification API in 2026](https://datacircle.dev/best-email-verification-api.txt)
- Get it: https://mailvalid.io/pricing
- Request: `POST https://mailvalid.io/api/v1/verify/bulk`
- API key: with the plan, on https://mailvalid.io/pricing
- Its API docs: https://mailvalid.io/docs#bulk-verification
- Sold by: MailValid (https://mailvalid.io)
- Checked: 2026-10-20

## In the answer

- Completeness: 67%
- Address: ✓
- Deliverability: ✓
- Confidence: ✓
- Company: ✓

## Price

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

## Aggregators

- Aggregators: none

## Charges

- Repeat free: never
- Also pays for: from the same budget: Single Email Verification

## Not found

- $ per 1,000: $0.00

## Catch-all

- $ per 1,000: $0.00

## Bounce

- Bounce refund: the equivalent credits of misverified emails, on a batch of 1,000+ below 99% accuracy, reported with its batch ID and bounce rate data and confirmed

## In their words

- Their pitch: MailValid's email verification API checks syntax, DNS/MX records, and SMTP mailbox existence in a single REST call, returning a result in under 500ms.

## Data

- Freshness: 30 days
- Keep data: no limit
- Use data: You agree NOT to use the Service to: Verify email addresses obtained without consent (spam, scraping, purchased lists), Violate any applicable laws, including anti-spam regulations (CAN-SPAM, GDPR, etc.), Resell, sublicense, or redistribute access to the Service without written permission, Attempt to reverse-engineer, decompile, or extract the Service's underlying technology, Exceed rate limits or attempt to disrupt the Service's infrastructure, Use the Service for any illegal, harmful, or fraudulent purpose

## Plan

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

## Rate limit

- Per second: 0.17
- Batch: 100

## Speed

- Answer: by polling or webhook

## The call

- You send: emails. Optional: webhook_url, filename, source_data
- Method: POST
- Path: /api/v1/verify/bulk

## About the plan

- Plan: Free
- Who can get it: anyone at least 18 years old

## The 23 fields the plan's answer can hold

email, status, is valid, syntax valid, domain, domain valid, has MX, MX records, SMTP checked, SMTP response code, disposable, role based, catch all, free provider, confidence score, status reason, provider, verification time, cached, job ID, total emails, credits reserved, credits used

## MailValid's plans (18)

- [MailValid, free, POST /api/v1/verify/bulk](https://datacircle.dev/validate-email-apis/mailvalid/free-post-api-v1-verify-bulk/llms.txt): $0.00 per 1,000, 67% complete, 30 days
- [MailValid, free tools](https://datacircle.dev/validate-email-apis/mailvalid/free-tools/llms.txt): $0.00 per 1,000, 50% complete
- [MailValid, $8 pack, Pay-as-you-go 2,000 credits, POST /api/v1/verify/bulk](https://datacircle.dev/validate-email-apis/mailvalid/8-pack-pay-as-you-go-2000-credits-post-api-v1-verify-bulk/llms.txt): $4.00 per 1,000, 67% complete, 30 days
- [MailValid, $19 pack, Pay-as-you-go 5,000 credits, POST /api/v1/verify/bulk](https://datacircle.dev/validate-email-apis/mailvalid/19-pack-pay-as-you-go-5000-credits-post-api-v1-verify-bulk/llms.txt): $3.80 per 1,000, 67% complete, 30 days
- [MailValid, $38 pack, Pay-as-you-go 10,000 credits, POST /api/v1/verify/bulk](https://datacircle.dev/validate-email-apis/mailvalid/38-pack-pay-as-you-go-10000-credits-post-api-v1-verify-bulk/llms.txt): $3.80 per 1,000, 67% complete, 30 days
- [MailValid, $79 pack, Pay-as-you-go 25,000 credits, POST /api/v1/verify/bulk](https://datacircle.dev/validate-email-apis/mailvalid/79-pack-pay-as-you-go-25000-credits-post-api-v1-verify-bulk/llms.txt): $3.16 per 1,000, 67% complete, 30 days
- [MailValid, $119 pack, Pay-as-you-go 50,000 credits, POST /api/v1/verify/bulk](https://datacircle.dev/validate-email-apis/mailvalid/119-pack-pay-as-you-go-50000-credits-post-api-v1-verify-bulk/llms.txt): $2.38 per 1,000, 67% complete, 30 days
- [MailValid, $179 pack, Pay-as-you-go 100,000 credits, POST /api/v1/verify/bulk](https://datacircle.dev/validate-email-apis/mailvalid/179-pack-pay-as-you-go-100000-credits-post-api-v1-verify-bulk/llms.txt): $1.79 per 1,000, 67% complete, 30 days
- [MailValid, $399 pack, Pay-as-you-go 250,000 credits, POST /api/v1/verify/bulk](https://datacircle.dev/validate-email-apis/mailvalid/399-pack-pay-as-you-go-250000-credits-post-api-v1-verify-bulk/llms.txt): $1.596 per 1,000, 67% complete, 30 days
- [MailValid, $599 pack, Pay-as-you-go 500,000 credits, POST /api/v1/verify/bulk](https://datacircle.dev/validate-email-apis/mailvalid/599-pack-pay-as-you-go-500000-credits-post-api-v1-verify-bulk/llms.txt): $1.198 per 1,000, 67% complete, 30 days
- [MailValid, $899 pack, Pay-as-you-go 1,000,000 credits, POST /api/v1/verify/bulk](https://datacircle.dev/validate-email-apis/mailvalid/899-pack-pay-as-you-go-1000000-credits-post-api-v1-verify-bulk/llms.txt): $0.899 per 1,000, 67% complete, 30 days
- [MailValid, $29 monthly, MailValid Plus 10,000 credits, POST /api/v1/verify/bulk](https://datacircle.dev/validate-email-apis/mailvalid/29-monthly-mailvalid-plus-10000-credits-post-api-v1-verify-bulk/llms.txt): $2.90 per 1,000, 67% complete, 30 days
- [MailValid, $79 monthly, MailValid Plus 50,000 credits, POST /api/v1/verify/bulk](https://datacircle.dev/validate-email-apis/mailvalid/79-monthly-mailvalid-plus-50000-credits-post-api-v1-verify-bulk/llms.txt): $1.58 per 1,000, 67% complete, 30 days
- [MailValid, $129 monthly, MailValid Plus 100,000 credits, POST /api/v1/verify/bulk](https://datacircle.dev/validate-email-apis/mailvalid/129-monthly-mailvalid-plus-100000-credits-post-api-v1-verify-bulk/llms.txt): $1.29 per 1,000, 67% complete, 30 days
- [MailValid, $299 monthly, MailValid Plus 250,000 credits, POST /api/v1/verify/bulk](https://datacircle.dev/validate-email-apis/mailvalid/299-monthly-mailvalid-plus-250000-credits-post-api-v1-verify-bulk/llms.txt): $1.196 per 1,000, 67% complete, 30 days
- [MailValid, $499 monthly, MailValid Plus 500,000 credits, POST /api/v1/verify/bulk](https://datacircle.dev/validate-email-apis/mailvalid/499-monthly-mailvalid-plus-500000-credits-post-api-v1-verify-bulk/llms.txt): $0.998 per 1,000, 67% complete, 30 days
- [MailValid, $799 monthly, MailValid Plus 1,000,000 credits, POST /api/v1/verify/bulk](https://datacircle.dev/validate-email-apis/mailvalid/799-monthly-mailvalid-plus-1000000-credits-post-api-v1-verify-bulk/llms.txt): $0.799 per 1,000, 67% complete, 30 days
- [MailValid, contact us, Enterprise, POST /api/v1/verify/bulk](https://datacircle.dev/validate-email-apis/mailvalid/contact-us-enterprise-post-api-v1-verify-bulk/llms.txt): 67% complete, 30 days

## MailValid's calls (3)

- `POST /api/v1/verify/bulk`: [MailValid, free, POST /api/v1/verify/bulk](https://datacircle.dev/validate-email-apis/mailvalid/free-post-api-v1-verify-bulk/llms.txt)
- `GET /api/tools/email`: [MailValid, free tools](https://datacircle.dev/validate-email-apis/mailvalid/free-tools/llms.txt)
- `POST /api/v1/verify/single`: [MailValid, free, POST /api/v1/verify/single](https://datacircle.dev/validate-email-apis/mailvalid/free-post-api-v1-verify-single/llms.txt)

## MailValid's APIs (1)

- [MailValid: email verification API pricing, 18 plans, POST /api/v1/verify/bulk](https://datacircle.dev/validate-email-apis/mailvalid/free-post-api-v1-verify-bulk/llms.txt)

## MailValid: email verification API alternatives

- [Mailercloud, $799 monthly, Email Verifier Plan – 1M, POST /verifyEmail](https://datacircle.dev/validate-email-apis/mailercloud/799-monthly-email-verifier-plan-1m-post-verifyemail/llms.txt): $0.799 per 1,000, 67% complete, live
- [VerifySwift, $39.99 pack](https://datacircle.dev/validate-email-apis/verifyswift/39-99-pack/llms.txt): $0.80 per 1,000, 50% complete, live
- [BillionVerify, $80 pack, Professional, POST /verify/bulk](https://datacircle.dev/validate-email-apis/billionverify/80-pack-professional-post-verify-bulk/llms.txt): $0.80 per 1,000, 67% complete, live
- [Verimail, $200 pack](https://datacircle.dev/validate-email-apis/verimail/200-pack/llms.txt): $0.80 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 2026-10-20.

- https://mailvalid.io/api/public-openapi.json
- https://mailvalid.io/docs
- https://mailvalid.io/faq.md
- https://mailvalid.io/llms.txt
- https://mailvalid.io/pricing
- https://mailvalid.io/pricing.md
- https://mailvalid.io/privacy
- https://mailvalid.io/refund
- https://mailvalid.io/terms
- https://mailvalid.io/use-cases/email-verification-api