# SMTPing, free, POST /verify/bulk: Email verification API

> One header, 13 verdicts over HTTP · 99.99% SLA

SMTPing's email verification API on its Free plan. It costs $0.00 per 1,000 emails. It returns 3 of the 6 key fields we check: Address, Deliverability, 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/smtping/free-free-post-verify-bulk
- [Best email verification API in 2026](https://datacircle.dev/best-email-verification-api.txt)
- Get it: https://smtping.com/pricing
- Request: `POST https://api.smtping.com/api/v1/verify/bulk`
- API key: with the plan, on https://smtping.com/pricing
- Its API docs: https://documenter.getpostman.com/view/58570952/2sBYB4Kmgp#24cd0783-4df6-4643-b62b-5ff5c5fbdbd9
- Sold by: SMTPing (https://smtping.com)
- Checked: 2026-10-28

## In the answer

- Completeness: 50%
- Address: ✓
- Deliverability: ✓
- Company: ✓

## Price

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

## Aggregators

- Aggregators: none

## Charges

- Also pays for: from the same budget: Verify one email address · Check one address against a list · Check up to 1,000 addresses · Submit a large list for one check · Every flag for one address (POST /checks/flags)

## Overage

- Units cap: hard

## Not found

- $ per 1,000: $0.00

## Catch-all

- $ per 1,000: $0.00

## In their words

- Their pitch: One header, 13 verdicts over HTTP · 99.99% SLA

## Data

- Freshness: live
- What it checks: format, mail servers, disposable domains, role addresses, mailbox
- Keep data: no limit
- Use data: Subject to your compliance with these Terms and timely payment of applicable fees, SMTPing grants you a non-exclusive, non-transferable, revocable license to access and use the Service for your internal business purposes. [...] Sharing accounts between unrelated individuals is prohibited, team-seat licensing is available for shared workflows. [...] Prohibited uses: You may not use the Service to verify email addresses obtained without consent, to validate lists for spam or unsolicited bulk email campaigns, or in any manner that violates applicable anti-spam laws including CAN-SPAM (US), CASL (Canada), GDPR (EU), PECR (UK), or comparable regulations in your jurisdiction. Verifying addresses for distribution of malware, phishing, fraud, or other illegal content. Reselling raw verification credits without a signed reseller agreement. Reverse engineering, scraping, or attempting to derive the source code of the Service. Using automated means to circumvent rate limits or extract bulk data beyond your subscription tier. Uploading lists containing protected health information (PHI) without an executed HIPAA Business Associate Agreement. Probing addresses you do not have a legitimate business reason to validate.

## Plan

- Pay: $0
- You get: 25 credits a day
- Enough for: 25 results a day

## Rate limit

- Per second: 0.00056
- Batch: 100,000

## Speed

- Answer: by polling

## The call

- You send: emails
- Method: POST
- Path: /verify/bulk

## About the plan

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

## The 8 fields the plan's answer can hold

email, status, status description, disposable, free domain, role-based domain, typos, domain

## SMTPing's plans (27)

- [SMTPing, free, POST /verify/bulk](https://datacircle.dev/validate-email-apis/smtping/free-free-post-verify-bulk/llms.txt): $0.00 per 1,000, 50% complete, live
- [SMTPing, $3 pack, 3k credits, POST /verify/bulk](https://datacircle.dev/validate-email-apis/smtping/3-pack-3k-credits-post-verify-bulk/llms.txt): $1.00 per 1,000, 50% complete, live
- [SMTPing, $5 pack, 5k credits, POST /verify/bulk](https://datacircle.dev/validate-email-apis/smtping/5-pack-5k-credits-post-verify-bulk/llms.txt): $1.00 per 1,000, 50% complete, live
- [SMTPing, $9 pack, 25k credits, POST /verify/bulk](https://datacircle.dev/validate-email-apis/smtping/9-pack-25k-credits-post-verify-bulk/llms.txt): $0.36 per 1,000, 50% complete, live
- [SMTPing, $11 pack, 30k credits, POST /verify/bulk](https://datacircle.dev/validate-email-apis/smtping/11-pack-30k-credits-post-verify-bulk/llms.txt): $0.367 per 1,000, 50% complete, live
- [SMTPing, $13 pack, 35k credits, POST /verify/bulk](https://datacircle.dev/validate-email-apis/smtping/13-pack-35k-credits-post-verify-bulk/llms.txt): $0.371 per 1,000, 50% complete, live
- [SMTPing, $16 pack, 40k credits, POST /verify/bulk](https://datacircle.dev/validate-email-apis/smtping/16-pack-40k-credits-post-verify-bulk/llms.txt): $0.40 per 1,000, 50% complete, live
- [SMTPing, $20 pack, 50k credits, POST /verify/bulk](https://datacircle.dev/validate-email-apis/smtping/20-pack-50k-credits-post-verify-bulk/llms.txt): $0.40 per 1,000, 50% complete, live
- [SMTPing, $24 pack, 60k credits, POST /verify/bulk](https://datacircle.dev/validate-email-apis/smtping/24-pack-60k-credits-post-verify-bulk/llms.txt): $0.40 per 1,000, 50% complete, live
- [SMTPing, $28 pack, 70k credits, POST /verify/bulk](https://datacircle.dev/validate-email-apis/smtping/28-pack-70k-credits-post-verify-bulk/llms.txt): $0.40 per 1,000, 50% complete, live
- [SMTPing, $32 pack, 80k credits, POST /verify/bulk](https://datacircle.dev/validate-email-apis/smtping/32-pack-80k-credits-post-verify-bulk/llms.txt): $0.40 per 1,000, 50% complete, live
- [SMTPing, $36 pack, 90k credits, POST /verify/bulk](https://datacircle.dev/validate-email-apis/smtping/36-pack-90k-credits-post-verify-bulk/llms.txt): $0.40 per 1,000, 50% complete, live
- [SMTPing, $38 pack, 100k credits, POST /verify/bulk](https://datacircle.dev/validate-email-apis/smtping/38-pack-100k-credits-post-verify-bulk/llms.txt): $0.38 per 1,000, 50% complete, live
- [SMTPing, $59 pack, 200k credits, POST /verify/bulk](https://datacircle.dev/validate-email-apis/smtping/59-pack-200k-credits-post-verify-bulk/llms.txt): $0.295 per 1,000, 50% complete, live
- [SMTPing, $63 pack, 250k credits, POST /verify/bulk](https://datacircle.dev/validate-email-apis/smtping/63-pack-250k-credits-post-verify-bulk/llms.txt): $0.252 per 1,000, 50% complete, live
- [SMTPing, $100 pack, 500k credits, POST /verify/bulk](https://datacircle.dev/validate-email-apis/smtping/100-pack-500k-credits-post-verify-bulk/llms.txt): $0.20 per 1,000, 50% complete, live
- [SMTPing, $150 pack, 1M credits, POST /verify/bulk](https://datacircle.dev/validate-email-apis/smtping/150-pack-1m-credits-post-verify-bulk/llms.txt): $0.15 per 1,000, 50% complete, live
- [SMTPing, $200 pack, 2M credits, POST /verify/bulk](https://datacircle.dev/validate-email-apis/smtping/200-pack-2m-credits-post-verify-bulk/llms.txt): $0.10 per 1,000, 50% complete, live
- [SMTPing, $300 pack, 3M credits, POST /verify/bulk](https://datacircle.dev/validate-email-apis/smtping/300-pack-3m-credits-post-verify-bulk/llms.txt): $0.10 per 1,000, 50% complete, live
- [SMTPing, $4.99 monthly, Basic, POST /verify/bulk](https://datacircle.dev/validate-email-apis/smtping/4-99-monthly-basic-post-verify-bulk/llms.txt): $0.832 per 1,000, 50% complete, live
- [SMTPing, $9.99 monthly, Standard, POST /verify/bulk](https://datacircle.dev/validate-email-apis/smtping/9-99-monthly-standard-post-verify-bulk/llms.txt): $0.333 per 1,000, 50% complete, live
- [SMTPing, $39.99 monthly, Business, POST /verify/bulk](https://datacircle.dev/validate-email-apis/smtping/39-99-monthly-business-post-verify-bulk/llms.txt): $0.267 per 1,000, 50% complete, live
- [SMTPing, $69.99 monthly, Enterprise, POST /verify/bulk](https://datacircle.dev/validate-email-apis/smtping/69-99-monthly-enterprise-post-verify-bulk/llms.txt): $0.233 per 1,000, 50% complete, live
- [SMTPing, $14 yearly, Basic, POST /verify/bulk](https://datacircle.dev/validate-email-apis/smtping/14-yearly-basic-post-verify-bulk/llms.txt): $0.194 per 1,000, 50% complete, live
- [SMTPing, $90 yearly, Standard, POST /verify/bulk](https://datacircle.dev/validate-email-apis/smtping/90-yearly-standard-post-verify-bulk/llms.txt): $0.25 per 1,000, 50% complete, live
- [SMTPing, $299 yearly, Business, POST /verify/bulk](https://datacircle.dev/validate-email-apis/smtping/299-yearly-business-post-verify-bulk/llms.txt): $0.166 per 1,000, 50% complete, live
- [SMTPing, $499 yearly, Enterprise, POST /verify/bulk](https://datacircle.dev/validate-email-apis/smtping/499-yearly-enterprise-post-verify-bulk/llms.txt): $0.139 per 1,000, 50% complete, live

## SMTPing's calls (2)

- `POST /verify/bulk`: [SMTPing, free, POST /verify/bulk](https://datacircle.dev/validate-email-apis/smtping/free-free-post-verify-bulk/llms.txt)
- `POST /verify/single`: [SMTPing, free, POST /verify/single](https://datacircle.dev/validate-email-apis/smtping/free-free-post-verify-single/llms.txt)

## SMTPing's APIs (1)

- [SMTPing: email verification API pricing, 27 plans, POST /verify/bulk](https://datacircle.dev/validate-email-apis/smtping/free-free-post-verify-bulk/llms.txt)

## SMTPing: email verification API alternatives

- [YepAPI, free](https://datacircle.dev/validate-email-apis/yepapi/free/llms.txt): $0.00 per 1,000, 50% complete, live
- [Mailsfinder, $19.99 monthly, Growth, POST /email/verifyEmail](https://datacircle.dev/validate-email-apis/mailsfinder/19-99-monthly-growth-post-email-verifyemail/llms.txt): $0.10 per 1,000, 50% complete, live
- [ProWebLook, $65,272.32 yearly](https://datacircle.dev/validate-email-apis/proweblook/65272-32-yearly/llms.txt): $0.109 per 1,000, 33% complete, live
- [Listclean, $625 pack, 5M Credits, GET /verify/email/{email}](https://datacircle.dev/validate-email-apis/listclean/625-pack-5m-credits-get-verify-email-email/llms.txt): $0.125 per 1,000, 33% complete, live
- [VerifySwift, $2,499.99 monthly, Daily Credits 600,000 a day](https://datacircle.dev/validate-email-apis/verifyswift/2499-99-monthly-daily-credits-600000-a-day/llms.txt): $0.139 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://documenter.getpostman.com/view/58570952/2sBYB4Kmgp
- https://smtping.com/openapi.json
- https://smtping.com/pricing
- https://smtping.com/terms