# MailSift, free, Free, POST /verify/batch: Cached email verification API

> MailSift is a fast, accurate email verification API and bulk CSV validator. It detects invalid, disposable, role-based, and risky email addresses using syntax, MX, SPF, DMARC, SMTP, and catch-all checks, returning a status and a 0–100 deliverability score.

MailSift's cached 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.
The cheapest of the 344 priced plans is [StableEnrich, pay as you go](https://datacircle.dev/cached-email-validation-apis/stableenrich/pay-as-you-go/llms.txt), at $0.005 per 1,000.

- This page: https://datacircle.dev/cached-email-validation-apis/mailsift/free-free-post-verify-batch
- Get it: https://mailsift.dev/pricing
- Its API docs: https://mailsift.dev/api#endpoints
- Sold by: MailSift (https://mailsift.dev)
- Checked: 2026-10-20

## In the answer

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

## Price

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

## Aggregators

- Aggregators: none

## Charges

- Per: result
- Also pays for: from the same budget: Verify one email · Verify one email with Deep Verification · Verify up to 100 emails at once with Deep Verification · Verify a CSV in bulk · Verify a CSV in bulk with Deep Verification

## Not found

- $ per 1,000: $0.00

## Catch-all

- $ per 1,000: $0.00

## In their words

- Their pitch: MailSift is a fast, accurate email verification API and bulk CSV validator. It detects invalid, disposable, role-based, and risky email addresses using syntax, MX, SPF, DMARC, SMTP, and catch-all checks, returning a status and a 0–100 deliverability score.

## Data

- Freshness: stored (MX, SPF, DMARC: live)
- Keep data: no limit
- Use data: You may not use MailSift to: send unsolicited email, harass individuals, build databases of contact information for sale, circumvent rate limits or terms, or for any unlawful purpose. [...] You are responsible for having a lawful basis to process the email addresses you submit, including, where applicable, consent under the GDPR. [...] We grant you a non-transferable, revocable license to use the service for its intended purpose.

## Plan

- Pay: $0
- You get: 500 credits
- Enough for: 500 results, once
- Expires: never

## Rate limit

- Per second: 1
- Batch: 100

## Speed

- Answer: in the call

## The call

- You send: emails. Optional: mode
- Method: POST
- Path: /verify/batch

## About the plan

- Plan: Free
- Who can get it: anyone 16 or older

## The 41 fields the plan's answer can hold

email, status, sub-status, score, mode, credits used, domain, MX records, free check, response time, checked at, engine version, normalized email, did you mean, MX provider, domain age, blocklist listings, SPF record, DMARC record, DMARC policy, catch-all confidence, reasons, syntax valid, free provider, disposable, MX, parked, relay, SPF, DMARC, catch-all, role address, blocklisted, MX routable, forwarder, SMTPUTF8, MTA-STS, TLS-RPT, BIMI, count, truncated

## MailSift's plans (5)

- [MailSift, free, Free, POST /verify/batch](https://datacircle.dev/cached-email-validation-apis/mailsift/free-free-post-verify-batch/llms.txt): $0.00 per 1,000, 67% complete, stored (MX, SPF, DMARC: live)
- [MailSift, $10 pack, Starter, POST /verify/batch](https://datacircle.dev/cached-email-validation-apis/mailsift/10-pack-starter-post-verify-batch/llms.txt): $0.40 per 1,000, 67% complete, stored (MX, SPF, DMARC: live)
- [MailSift, $35 pack, Growth, POST /verify/batch](https://datacircle.dev/cached-email-validation-apis/mailsift/35-pack-growth-post-verify-batch/llms.txt): $0.35 per 1,000, 67% complete, stored (MX, SPF, DMARC: live)
- [MailSift, $99 pack, Pro, POST /verify/batch](https://datacircle.dev/cached-email-validation-apis/mailsift/99-pack-pro-post-verify-batch/llms.txt): $0.283 per 1,000, 67% complete, stored (MX, SPF, DMARC: live)
- [MailSift, $249 pack, Enterprise, POST /verify/batch](https://datacircle.dev/cached-email-validation-apis/mailsift/249-pack-enterprise-post-verify-batch/llms.txt): $0.249 per 1,000, 67% complete, stored (MX, SPF, DMARC: live)

## MailSift's calls (3)

- `POST /verify/bulk`: [MailSift, free, Free, POST /verify/bulk](https://datacircle.dev/cached-email-validation-apis/mailsift/free-free-post-verify-bulk/llms.txt)
- `GET /verify`: [MailSift, free, Free, GET /verify](https://datacircle.dev/cached-email-validation-apis/mailsift/free-free-get-verify/llms.txt)
- `POST /verify/batch`: [MailSift, free, Free, POST /verify/batch](https://datacircle.dev/cached-email-validation-apis/mailsift/free-free-post-verify-batch/llms.txt)

## MailSift's APIs (2)

- [MailSift: cached email verification API pricing, 5 plans, POST /verify/batch](https://datacircle.dev/cached-email-validation-apis/mailsift/free-free-post-verify-batch/llms.txt)
- [MailSift: email verification API pricing, 5 plans, POST /verify/bulk](https://datacircle.dev/validate-email-apis/mailsift/free-free-post-verify-bulk-verify-a-csv-in-bulk-with-deep-verification/llms.txt)
- [MailSift: email verification API pricing, 5 plans, GET /verify](https://datacircle.dev/validate-email-apis/mailsift/free-free-get-verify-verify-one-email-with-deep-verification/llms.txt)
- [MailSift: email verification API pricing, 5 plans, POST /verify/batch](https://datacircle.dev/validate-email-apis/mailsift/free-free-post-verify-batch-verify-up-to-100-emails-at-once-with-deep-verification/llms.txt)

## MailSift: cached email verification API alternatives

- [EmailDetective, free, Free, POST /emails](https://datacircle.dev/cached-email-validation-apis/emaildetective/free-free-post-emails/llms.txt): $0.00 per 1,000, 83% complete, stored
- [Strale, free, trial credits, POST /v1/do, Bulk Email Validation](https://datacircle.dev/cached-email-validation-apis/strale/free-trial-credits-post-v1-do-bulk-email-validation/llms.txt): $0.00 per 1,000, 50% complete, stored
- [APIVerve, free](https://datacircle.dev/cached-email-validation-apis/apiverve/free/llms.txt): $0.00 per 1,000, 50% complete, stored (MX valid, MX record, null MX, can receive mail, has SPF, has DMARC: live)
- [Botoi, free, Free, POST /v1/disposable-email/check](https://datacircle.dev/cached-email-validation-apis/botoi/free-free-post-v1-disposable-email-check/llms.txt): $0.00 per 1,000, 50% complete, stored

## 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://mailsift.dev
- https://mailsift.dev/api
- https://mailsift.dev/docs/api-reference.md
- https://mailsift.dev/docs/overview.md
- https://mailsift.dev/llms.txt
- https://mailsift.dev/openapi.json
- https://mailsift.dev/pricing
- https://mailsift.dev/terms