# Mailfloss, free, Free, POST /v1/batch-verify: Email validation API

> A REST API for verifying email addresses — JSON in, JSON out. Built for product teams and AI agents that need programmatic answers, not dashboards.

Mailfloss's email validation API on its Free plan, $0.00 per 1,000 emails. 3 of the 6 key fields: Address, Its check, Company.

- This page: https://datacircle.dev/validate-email-apis/mailfloss/free-free-post-v1-batch-verify
- Get it: https://mailfloss.com/pricing/
- Its API docs: https://developers.mailfloss.com
- Sold by: Mailfloss (https://mailfloss.com)
- Checked: 2026-10-20

## In the answer

- Completeness: 50%
- Address: ✓
- Its check: ✓
- Company: ✓

## Price

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

## Aggregators

- Aggregators: none

## Charges

- Per: result
- Also pays for: from the same budget: Verify a single email address

## Not found

- $ per 1,000: $0.00

## In their words

- Their pitch: A REST API for verifying email addresses — JSON in, JSON out. Built for product teams and AI agents that need programmatic answers, not dashboards.

## Data

- Freshness: live
- Keep data: no limit
- Use data: You may only use the Mailfloss Service solely for Your own internal business use [...] only for lawful purposes and in accordance with these Terms of Use

## Plan

- Pay: $0
- You get: 500 credits a month
- Enough for: 500 results a month

## Rate limit

- Per second: 166.67

## Speed

- Answer: by polling or webhook

## The call

- You send: emails. Optional: webhook_url, Idempotency-Key
- Method: POST
- Path: /v1/batch-verify

## About the plan

- Plan: Free
- Who can get it: anyone of the legal age of majority, for their own internal business use

## The 15 fields the plan's answer can hold

job id, email, domain, status, reason, passed, processed, suggestion, completed at, index, fixed, deleted, unsubscribed, updated, tagged

## Mailfloss's plans (45)

- [Mailfloss, free, Free, POST /v1/batch-verify](https://datacircle.dev/validate-email-apis/mailfloss/free-free-post-v1-batch-verify/llms.txt): $0.00 per 1,000, 50% complete, live
- [Mailfloss, $8 pack, Prepaid credits 1,000, POST /v1/batch-verify](https://datacircle.dev/validate-email-apis/mailfloss/8-pack-prepaid-credits-1000-post-v1-batch-verify/llms.txt): $8.00 per 1,000, 50% complete, live
- [Mailfloss, $40 pack, Prepaid credits 10,000, POST /v1/batch-verify](https://datacircle.dev/validate-email-apis/mailfloss/40-pack-prepaid-credits-10000-post-v1-batch-verify/llms.txt): $4.00 per 1,000, 50% complete, live
- [Mailfloss, $160 pack, Prepaid credits 50,000, POST /v1/batch-verify](https://datacircle.dev/validate-email-apis/mailfloss/160-pack-prepaid-credits-50000-post-v1-batch-verify/llms.txt): $3.20 per 1,000, 50% complete, live
- [Mailfloss, $300 pack, Prepaid credits 100,000, POST /v1/batch-verify](https://datacircle.dev/validate-email-apis/mailfloss/300-pack-prepaid-credits-100000-post-v1-batch-verify/llms.txt): $3.00 per 1,000, 50% complete, live
- [Mailfloss, $500 pack, Prepaid credits 250,000, POST /v1/batch-verify](https://datacircle.dev/validate-email-apis/mailfloss/500-pack-prepaid-credits-250000-post-v1-batch-verify/llms.txt): $2.00 per 1,000, 50% complete, live
- [Mailfloss, $800 pack, Prepaid credits 500,000, POST /v1/batch-verify](https://datacircle.dev/validate-email-apis/mailfloss/800-pack-prepaid-credits-500000-post-v1-batch-verify/llms.txt): $1.60 per 1,000, 50% complete, live
- [Mailfloss, $1,200 pack, Prepaid credits 1,000,000, POST /v1/batch-verify](https://datacircle.dev/validate-email-apis/mailfloss/1200-pack-prepaid-credits-1000000-post-v1-batch-verify/llms.txt): $1.20 per 1,000, 50% complete, live
- [Mailfloss, $2,600 pack, Prepaid credits 2,500,000, POST /v1/batch-verify](https://datacircle.dev/validate-email-apis/mailfloss/2600-pack-prepaid-credits-2500000-post-v1-batch-verify/llms.txt): $1.04 per 1,000, 50% complete, live
- [Mailfloss, $29 monthly, Lite 10,000 credits/month, POST /v1/batch-verify](https://datacircle.dev/validate-email-apis/mailfloss/29-monthly-lite-10000-credits-month-post-v1-batch-verify/llms.txt): $2.90 per 1,000, 50% complete, live
- [Mailfloss, $59 monthly, Business 25,000 credits/month, POST /v1/batch-verify](https://datacircle.dev/validate-email-apis/mailfloss/59-monthly-business-25000-credits-month-post-v1-batch-verify/llms.txt): $2.36 per 1,000, 50% complete, live
- [Mailfloss, $64 monthly, Lite 20,000 credits/month, POST /v1/batch-verify](https://datacircle.dev/validate-email-apis/mailfloss/64-monthly-lite-20000-credits-month-post-v1-batch-verify/llms.txt): $3.20 per 1,000, 50% complete, live
- [Mailfloss, $94 monthly, Business 35,000 credits/month, POST /v1/batch-verify](https://datacircle.dev/validate-email-apis/mailfloss/94-monthly-business-35000-credits-month-post-v1-batch-verify/llms.txt): $2.686 per 1,000, 50% complete, live
- [Mailfloss, $174 monthly, Lite 60,000 credits/month, POST /v1/batch-verify](https://datacircle.dev/validate-email-apis/mailfloss/174-monthly-lite-60000-credits-month-post-v1-batch-verify/llms.txt): $2.90 per 1,000, 50% complete, live
- [Mailfloss, $204 monthly, Business 75,000 credits/month, POST /v1/batch-verify](https://datacircle.dev/validate-email-apis/mailfloss/204-monthly-business-75000-credits-month-post-v1-batch-verify/llms.txt): $2.72 per 1,000, 50% complete, live
- [Mailfloss, $209 monthly, Pro 125,000 credits/month, POST /v1/batch-verify](https://datacircle.dev/validate-email-apis/mailfloss/209-monthly-pro-125000-credits-month-post-v1-batch-verify/llms.txt): $1.672 per 1,000, 50% complete, live
- [Mailfloss, $244 monthly, Pro 135,000 credits/month, POST /v1/batch-verify](https://datacircle.dev/validate-email-apis/mailfloss/244-monthly-pro-135000-credits-month-post-v1-batch-verify/llms.txt): $1.807 per 1,000, 50% complete, live
- [Mailfloss, $299 monthly, Lite 110,000 credits/month, POST /v1/batch-verify](https://datacircle.dev/validate-email-apis/mailfloss/299-monthly-lite-110000-credits-month-post-v1-batch-verify/llms.txt): $2.718 per 1,000, 50% complete, live
- [Mailfloss, $329 monthly, Business 125,000 credits/month, POST /v1/batch-verify](https://datacircle.dev/validate-email-apis/mailfloss/329-monthly-business-125000-credits-month-post-v1-batch-verify/llms.txt): $2.632 per 1,000, 50% complete, live
- [Mailfloss, $354 monthly, Pro 175,000 credits/month, POST /v1/batch-verify](https://datacircle.dev/validate-email-apis/mailfloss/354-monthly-pro-175000-credits-month-post-v1-batch-verify/llms.txt): $2.023 per 1,000, 50% complete, live
- [Mailfloss, $479 monthly, Pro 225,000 credits/month, POST /v1/batch-verify](https://datacircle.dev/validate-email-apis/mailfloss/479-monthly-pro-225000-credits-month-post-v1-batch-verify/llms.txt): $2.129 per 1,000, 50% complete, live
- [Mailfloss, $479 monthly, Lite 260,000 credits/month, POST /v1/batch-verify](https://datacircle.dev/validate-email-apis/mailfloss/479-monthly-lite-260000-credits-month-post-v1-batch-verify/llms.txt): $1.842 per 1,000, 50% complete, live
- [Mailfloss, $509 monthly, Business 275,000 credits/month, POST /v1/batch-verify](https://datacircle.dev/validate-email-apis/mailfloss/509-monthly-business-275000-credits-month-post-v1-batch-verify/llms.txt): $1.851 per 1,000, 50% complete, live
- [Mailfloss, $659 monthly, Pro 375,000 credits/month, POST /v1/batch-verify](https://datacircle.dev/validate-email-apis/mailfloss/659-monthly-pro-375000-credits-month-post-v1-batch-verify/llms.txt): $1.757 per 1,000, 50% complete, live
- [Mailfloss, $729 monthly, Lite 510,000 credits/month, POST /v1/batch-verify](https://datacircle.dev/validate-email-apis/mailfloss/729-monthly-lite-510000-credits-month-post-v1-batch-verify/llms.txt): $1.429 per 1,000, 50% complete, live
- [Mailfloss, $759 monthly, Business 525,000 credits/month, POST /v1/batch-verify](https://datacircle.dev/validate-email-apis/mailfloss/759-monthly-business-525000-credits-month-post-v1-batch-verify/llms.txt): $1.446 per 1,000, 50% complete, live
- [Mailfloss, $909 monthly, Pro 625,000 credits/month, POST /v1/batch-verify](https://datacircle.dev/validate-email-apis/mailfloss/909-monthly-pro-625000-credits-month-post-v1-batch-verify/llms.txt): $1.454 per 1,000, 50% complete, live
- [Mailfloss, $290 yearly, Lite 10,000 credits/month, billed annually, POST /v1/batch-verify](https://datacircle.dev/validate-email-apis/mailfloss/290-yearly-lite-10000-credits-month-billed-annually-post-v1-batch-verify/llms.txt): $2.417 per 1,000, 50% complete, live
- [Mailfloss, $590 yearly, Business 25,000 credits/month, billed annually, POST /v1/batch-verify](https://datacircle.dev/validate-email-apis/mailfloss/590-yearly-business-25000-credits-month-billed-annually-post-v1-batch-verify/llms.txt): $1.967 per 1,000, 50% complete, live
- [Mailfloss, $640 yearly, Lite 20,000 credits/month, billed annually, POST /v1/batch-verify](https://datacircle.dev/validate-email-apis/mailfloss/640-yearly-lite-20000-credits-month-billed-annually-post-v1-batch-verify/llms.txt): $2.667 per 1,000, 50% complete, live
- [Mailfloss, $940 yearly, Business 35,000 credits/month, billed annually, POST /v1/batch-verify](https://datacircle.dev/validate-email-apis/mailfloss/940-yearly-business-35000-credits-month-billed-annually-post-v1-batch-verify/llms.txt): $2.238 per 1,000, 50% complete, live
- [Mailfloss, $1,740 yearly, Lite 60,000 credits/month, billed annually, POST /v1/batch-verify](https://datacircle.dev/validate-email-apis/mailfloss/1740-yearly-lite-60000-credits-month-billed-annually-post-v1-batch-verify/llms.txt): $2.417 per 1,000, 50% complete, live
- [Mailfloss, $2,040 yearly, Business 75,000 credits/month, billed annually, POST /v1/batch-verify](https://datacircle.dev/validate-email-apis/mailfloss/2040-yearly-business-75000-credits-month-billed-annually-post-v1-batch-verify/llms.txt): $2.267 per 1,000, 50% complete, live
- [Mailfloss, $2,090 yearly, Pro 125,000 credits/month, billed annually, POST /v1/batch-verify](https://datacircle.dev/validate-email-apis/mailfloss/2090-yearly-pro-125000-credits-month-billed-annually-post-v1-batch-verify/llms.txt): $1.393 per 1,000, 50% complete, live
- [Mailfloss, $2,440 yearly, Pro 135,000 credits/month, billed annually, POST /v1/batch-verify](https://datacircle.dev/validate-email-apis/mailfloss/2440-yearly-pro-135000-credits-month-billed-annually-post-v1-batch-verify/llms.txt): $1.506 per 1,000, 50% complete, live
- [Mailfloss, $2,990 yearly, Lite 110,000 credits/month, billed annually, POST /v1/batch-verify](https://datacircle.dev/validate-email-apis/mailfloss/2990-yearly-lite-110000-credits-month-billed-annually-post-v1-batch-verify/llms.txt): $2.265 per 1,000, 50% complete, live
- [Mailfloss, $3,290 yearly, Business 125,000 credits/month, billed annually, POST /v1/batch-verify](https://datacircle.dev/validate-email-apis/mailfloss/3290-yearly-business-125000-credits-month-billed-annually-post-v1-batch-verify/llms.txt): $2.193 per 1,000, 50% complete, live
- [Mailfloss, $3,540 yearly, Pro 175,000 credits/month, billed annually, POST /v1/batch-verify](https://datacircle.dev/validate-email-apis/mailfloss/3540-yearly-pro-175000-credits-month-billed-annually-post-v1-batch-verify/llms.txt): $1.686 per 1,000, 50% complete, live
- [Mailfloss, $4,790 yearly, Pro 225,000 credits/month, billed annually, POST /v1/batch-verify](https://datacircle.dev/validate-email-apis/mailfloss/4790-yearly-pro-225000-credits-month-billed-annually-post-v1-batch-verify/llms.txt): $1.774 per 1,000, 50% complete, live
- [Mailfloss, $4,790 yearly, Lite 260,000 credits/month, billed annually, POST /v1/batch-verify](https://datacircle.dev/validate-email-apis/mailfloss/4790-yearly-lite-260000-credits-month-billed-annually-post-v1-batch-verify/llms.txt): $1.535 per 1,000, 50% complete, live
- [Mailfloss, $5,090 yearly, Business 275,000 credits/month, billed annually, POST /v1/batch-verify](https://datacircle.dev/validate-email-apis/mailfloss/5090-yearly-business-275000-credits-month-billed-annually-post-v1-batch-verify/llms.txt): $1.542 per 1,000, 50% complete, live
- [Mailfloss, $6,590 yearly, Pro 375,000 credits/month, billed annually, POST /v1/batch-verify](https://datacircle.dev/validate-email-apis/mailfloss/6590-yearly-pro-375000-credits-month-billed-annually-post-v1-batch-verify/llms.txt): $1.464 per 1,000, 50% complete, live
- [Mailfloss, $7,290 yearly, Lite 510,000 credits/month, billed annually, POST /v1/batch-verify](https://datacircle.dev/validate-email-apis/mailfloss/7290-yearly-lite-510000-credits-month-billed-annually-post-v1-batch-verify/llms.txt): $1.191 per 1,000, 50% complete, live
- [Mailfloss, $7,590 yearly, Business 525,000 credits/month, billed annually, POST /v1/batch-verify](https://datacircle.dev/validate-email-apis/mailfloss/7590-yearly-business-525000-credits-month-billed-annually-post-v1-batch-verify/llms.txt): $1.205 per 1,000, 50% complete, live
- [Mailfloss, $9,090 yearly, Pro 625,000 credits/month, billed annually, POST /v1/batch-verify](https://datacircle.dev/validate-email-apis/mailfloss/9090-yearly-pro-625000-credits-month-billed-annually-post-v1-batch-verify/llms.txt): $1.212 per 1,000, 50% complete, live

## Mailfloss's calls (2)

- `POST /v1/batch-verify`: [Mailfloss, free, Free, POST /v1/batch-verify](https://datacircle.dev/validate-email-apis/mailfloss/free-free-post-v1-batch-verify/llms.txt)
- `GET /v1/verify`: [Mailfloss, free, Free, GET /v1/verify](https://datacircle.dev/validate-email-apis/mailfloss/free-free-get-v1-verify/llms.txt)

## Similar plans of other providers

- [Mailrook, free, forever, GET /v1/validate/{email}](https://datacircle.dev/validate-email-apis/mailrook/free-forever-get-v1-validate-email/llms.txt): $0.00 per 1,000, 67% complete, live
- [MailSift, free, Free, GET /verify, Verify one email](https://datacircle.dev/validate-email-apis/mailsift/free-free-get-verify-verify-one-email/llms.txt): $0.00 per 1,000, 67% complete, live
- [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, 67% 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

## 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://api.mailfloss.com/v1/openapi.json
- https://developers.mailfloss.com
- https://developers.mailfloss.com/rate-limits
- https://docs.mailfloss.com/do-prepaid-credits-come-with-the-same-features-as-subscription-plans
- https://docs.mailfloss.com/how-to-generate-an-api-key-and-add-a-webhook-in-mailfloss
- https://docs.mailfloss.com/pricings-for-subscription-plans-subscription-add-ons-and-prepaid-credits
- https://docs.mailfloss.com/understanding-prepaid-credits
- https://docs.mailfloss.com/understanding-subscription-credits
- https://docs.mailfloss.com/understanding-your-credits-subscription-and-prepaid
- https://docs.mailfloss.com/what-is-overage-and-how-does-it-work
- https://mailfloss.com/developer-terms/
- https://mailfloss.com/email-verification-api/
- https://mailfloss.com/pricing/
- https://mailfloss.com/terms/