# ReefAPI, free: Email verification API

> Validate an email: syntax + live MX + disposable-domain + role-account flags.

ReefAPI'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/reefapi/free
- [Best email verification API in 2026](https://datacircle.dev/best-email-verification-api.txt)
- Get it: https://reefapi.com/pricing
- Request: `POST https://api.reefapi.com/validate/v1/email`
- API key: with the plan, on https://reefapi.com/pricing
- Its API docs: https://reefapi.com/docs/validate#ep-email
- Sold by: ReefAPI (https://reefapi.com)
- Checked: 2026-10-27

## In the answer

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

## Price

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

## Aggregators

- Aggregators: none

## Charges

- Also pays for: from the same budget: 584 other calls

## Overage

- Units cap: hard

## Not found

- $ per 1,000: $0.00

## In their words

- Their pitch: Validate an email: syntax + live MX + disposable-domain + role-account flags.

## Data

- Freshness: stored
- What it checks: format, mail servers, disposable domains, role addresses
- Keep data: no limit
- Use data: You are solely responsible for how you use the data you retrieve and for ensuring your use complies with all applicable laws, third-party terms, and the rights of others (including data-protection, intellectual-property, and anti-spam laws) in your jurisdiction and your users'. You will not use the Service to break the law, infringe rights, send spam, or build a competing bulk-redistribution product. [...] Don't attempt to circumvent authentication, rate limits, or credit metering, don't probe, scan, or stress the Service except your own account within posted limits. [...] Where a source requires attribution, we surface it in the response meta, honor it.

## Plan

- Pay: $0
- You get: 1,000 credits
- Enough for: 1,000 calls
- Expires: never

## Rate limit

- Per second: 10
- Batch: 1

## Speed

- Answer: in the call

## The call

- You send: email. Optional: check_mx
- Method: POST
- Path: /validate/v1/email

## About the plan

- Plan: Free
- Who can get it: anyone

## The 14 fields the plan's answer can hold

valid, email, syntax valid, local part, domain, has MX records, MX records, disposable, role account, free provider, did you mean, deliverable, score, reason

## ReefAPI's plans (11)

- [ReefAPI, free](https://datacircle.dev/validate-email-apis/reefapi/free/llms.txt): $0.00 per 1,000, 67% complete, stored
- [ReefAPI, $15 monthly](https://datacircle.dev/validate-email-apis/reefapi/15-monthly/llms.txt): $1.50 per 1,000, 67% complete, stored
- [ReefAPI, $50 monthly](https://datacircle.dev/validate-email-apis/reefapi/50-monthly/llms.txt): $1.00 per 1,000, 67% complete, stored
- [ReefAPI, $200 monthly](https://datacircle.dev/validate-email-apis/reefapi/200-monthly/llms.txt): $0.667 per 1,000, 67% complete, stored
- [ReefAPI, $33.75 quarterly](https://datacircle.dev/validate-email-apis/reefapi/33-75-quarterly/llms.txt): $1.125 per 1,000, 67% complete, stored
- [ReefAPI, $112.50 quarterly](https://datacircle.dev/validate-email-apis/reefapi/112-50-quarterly/llms.txt): $0.75 per 1,000, 67% complete, stored
- [ReefAPI, $450 quarterly](https://datacircle.dev/validate-email-apis/reefapi/450-quarterly/llms.txt): $0.50 per 1,000, 67% complete, stored
- [ReefAPI, $90 yearly](https://datacircle.dev/validate-email-apis/reefapi/90-yearly/llms.txt): $0.75 per 1,000, 67% complete, stored
- [ReefAPI, $300 yearly](https://datacircle.dev/validate-email-apis/reefapi/300-yearly/llms.txt): $0.50 per 1,000, 67% complete, stored
- [ReefAPI, $1,200 yearly](https://datacircle.dev/validate-email-apis/reefapi/1200-yearly/llms.txt): $0.333 per 1,000, 67% complete, stored
- [ReefAPI, contact us](https://datacircle.dev/validate-email-apis/reefapi/contact-us/llms.txt): 67% complete, stored

## ReefAPI's calls for this API (1)

- `POST /validate/v1/email`: [ReefAPI, free](https://datacircle.dev/validate-email-apis/reefapi/free/llms.txt)

## ReefAPI's APIs (15)

- [ReefAPI: company open jobs API pricing, 11 plans, POST /ats-jobs/v1/company_jobs, company_jobs (Ashby)](https://datacircle.dev/company-open-job-apis/reefapi/free-free-post-ats-jobs-v1-company-jobs-company-jobs-ashby/llms.txt)
- [ReefAPI: company open jobs API pricing, 11 plans, POST /glassdoor/v1/employer/jobs](https://datacircle.dev/company-open-job-apis/reefapi/free-free-post-glassdoor-v1-employer-jobs/llms.txt)
- [ReefAPI: company open jobs API pricing, 11 plans, POST /ats-jobs/v1/company_jobs, company_jobs (Greenhouse)](https://datacircle.dev/company-open-job-apis/reefapi/free-free-post-ats-jobs-v1-company-jobs-company-jobs-greenhouse/llms.txt)
- [ReefAPI: company open jobs API pricing, 11 plans, POST /ats-jobs/v1/company_jobs, company_jobs (Lever)](https://datacircle.dev/company-open-job-apis/reefapi/free-free-post-ats-jobs-v1-company-jobs-company-jobs-lever/llms.txt)
- [ReefAPI: company open jobs API pricing, 11 plans, POST /linkedin-jobs/v1/jobs/by-company](https://datacircle.dev/company-open-job-apis/reefapi/free-free-post-linkedin-jobs-v1-jobs-by-company/llms.txt)
- [ReefAPI: company open jobs API pricing, 11 plans, POST /reed/v1/company-jobs](https://datacircle.dev/company-open-job-apis/reefapi/free-free-post-reed-v1-company-jobs/llms.txt)
- [ReefAPI: company open jobs API pricing, 11 plans, POST /seek/v1/company-jobs](https://datacircle.dev/company-open-job-apis/reefapi/free-free-post-seek-v1-company-jobs/llms.txt)
- [ReefAPI: company open jobs API pricing, 11 plans, POST /ats-jobs/v1/company_jobs, company_jobs (Workable)](https://datacircle.dev/company-open-job-apis/reefapi/free-free-post-ats-jobs-v1-company-jobs-company-jobs-workable/llms.txt)
- [ReefAPI: company open jobs API pricing, 11 plans, POST /ziprecruiter/v1/jobs_by_company](https://datacircle.dev/company-open-job-apis/reefapi/free-free-post-ziprecruiter-v1-jobs-by-company/llms.txt)
- [ReefAPI: job posting details API pricing, 11 plans, POST /ats-jobs/v1/job_detail, job_detail (Ashby)](https://datacircle.dev/job-posting-details-apis/reefapi/free-free-post-ats-jobs-v1-job-detail-job-detail-ashby/llms.txt)
- [ReefAPI: job posting details API pricing, 11 plans, POST /global-jobs/v1/jobs/detail, jobs/detail (Catho)](https://datacircle.dev/job-posting-details-apis/reefapi/free-free-post-global-jobs-v1-jobs-detail-jobs-detail-catho/llms.txt)
- [ReefAPI: job posting details API pricing, 11 plans, POST /ats-jobs/v1/job_detail, job_detail (Greenhouse)](https://datacircle.dev/job-posting-details-apis/reefapi/free-free-post-ats-jobs-v1-job-detail-job-detail-greenhouse/llms.txt)
- [ReefAPI: job posting details API pricing, 11 plans, POST /global-jobs/v1/jobs/detail, jobs/detail (Gupy)](https://datacircle.dev/job-posting-details-apis/reefapi/free-free-post-global-jobs-v1-jobs-detail-jobs-detail-gupy/llms.txt)
- [ReefAPI: job posting details API pricing, 11 plans, POST /indeed/v1/job](https://datacircle.dev/job-posting-details-apis/reefapi/free-free-post-indeed-v1-job/llms.txt)
- [ReefAPI: job posting details API pricing, 11 plans, POST /ats-jobs/v1/job_detail, job_detail (Lever)](https://datacircle.dev/job-posting-details-apis/reefapi/free-free-post-ats-jobs-v1-job-detail-job-detail-lever/llms.txt)
- [ReefAPI: job posting details API pricing, 11 plans, POST /reed/v1/detail](https://datacircle.dev/job-posting-details-apis/reefapi/free-free-post-reed-v1-detail/llms.txt)
- [ReefAPI: job posting details API pricing, 11 plans, POST /seek/v1/detail](https://datacircle.dev/job-posting-details-apis/reefapi/free-free-post-seek-v1-detail/llms.txt)
- [ReefAPI: job posting details API pricing, 11 plans, POST /global-jobs/v1/jobs/detail, jobs/detail (StepStone)](https://datacircle.dev/job-posting-details-apis/reefapi/free-free-post-global-jobs-v1-jobs-detail-jobs-detail-stepstone/llms.txt)
- [ReefAPI: job posting details API pricing, 11 plans, POST /ats-jobs/v1/job_detail, job_detail (Workable)](https://datacircle.dev/job-posting-details-apis/reefapi/free-free-post-ats-jobs-v1-job-detail-job-detail-workable/llms.txt)
- [ReefAPI: job posting details API pricing, 11 plans, POST /ziprecruiter/v1/job_detail](https://datacircle.dev/job-posting-details-apis/reefapi/free-free-post-ziprecruiter-v1-job-detail/llms.txt)
- [ReefAPI: news API pricing, 11 plans](https://datacircle.dev/news-apis/reefapi/free/llms.txt)
- [ReefAPI: job postings API pricing, 11 plans, POST /global-jobs/v1/jobs/search, jobs/search (Catho)](https://datacircle.dev/job-posting-apis/reefapi/free-free-post-global-jobs-v1-jobs-search-jobs-search-catho/llms.txt)
- [ReefAPI: job postings API pricing, 11 plans, POST /global-jobs/v1/jobs/search, jobs/search (Gupy)](https://datacircle.dev/job-posting-apis/reefapi/free-free-post-global-jobs-v1-jobs-search-jobs-search-gupy/llms.txt)
- [ReefAPI: job postings API pricing, 11 plans, POST /indeed/v1/jobs/search](https://datacircle.dev/job-posting-apis/reefapi/free-free-post-indeed-v1-jobs-search/llms.txt)
- [ReefAPI: job postings API pricing, 11 plans, POST /global-jobs/v1/jobs/search, jobs/search (StepStone)](https://datacircle.dev/job-posting-apis/reefapi/free-free-post-global-jobs-v1-jobs-search-jobs-search-stepstone/llms.txt)
- [ReefAPI: job postings API pricing, 11 plans, POST /ats-jobs/v1/search](https://datacircle.dev/job-posting-apis/reefapi/free-free-post-ats-jobs-v1-search/llms.txt)
- [ReefAPI: job postings API pricing, 11 plans, POST /ziprecruiter/v1/search](https://datacircle.dev/job-posting-apis/reefapi/free-free-post-ziprecruiter-v1-search/llms.txt)
- [ReefAPI: job postings API pricing, 11 plans, POST /seek/v1/classification](https://datacircle.dev/job-posting-apis/reefapi/free-free-post-seek-v1-classification/llms.txt)
- [ReefAPI: job postings API pricing, 11 plans, POST /reed/v1/search](https://datacircle.dev/job-posting-apis/reefapi/free-free-post-reed-v1-search/llms.txt)
- [ReefAPI: job postings API pricing, 11 plans, POST /seek/v1/search](https://datacircle.dev/job-posting-apis/reefapi/free-free-post-seek-v1-search/llms.txt)
- [ReefAPI: job postings API pricing, 11 plans, POST /reed/v1/sector](https://datacircle.dev/job-posting-apis/reefapi/free-free-post-reed-v1-sector/llms.txt)
- [ReefAPI: company enrichment API pricing, 11 plans, POST /glassdoor/v1/employer/detail](https://datacircle.dev/company-enrichment-apis/reefapi/free-free-post-glassdoor-v1-employer-detail/llms.txt)
- [ReefAPI: company enrichment API pricing, 11 plans, POST /indeed/v1/company](https://datacircle.dev/company-enrichment-apis/reefapi/free-free-post-indeed-v1-company/llms.txt)
- [ReefAPI: company enrichment API pricing, 11 plans, POST /enrich-company/v1/company_domain](https://datacircle.dev/company-enrichment-apis/reefapi/free/llms.txt)
- [ReefAPI: company enrichment API pricing, 11 plans, POST /google-maps/v1/place/by-id](https://datacircle.dev/company-enrichment-apis/reefapi/free-free-post-google-maps-v1-place-by-id/llms.txt)
- [ReefAPI: company enrichment API pricing, 11 plans, POST /google-maps/v1/place/detail](https://datacircle.dev/company-enrichment-apis/reefapi/free-free-post-google-maps-v1-place-detail/llms.txt)
- [ReefAPI: Glassdoor review API pricing, 11 plans](https://datacircle.dev/glassdoor-review-apis/reefapi/free/llms.txt)
- [ReefAPI: company discovery API pricing, 11 plans, POST /indeed/v1/company/search](https://datacircle.dev/company-discovery-apis/reefapi/free-free-post-indeed-v1-company-search/llms.txt)
- [ReefAPI: company discovery API pricing, 11 plans, POST /google-maps/v1/place/nearby](https://datacircle.dev/company-discovery-apis/reefapi/free-free-post-google-maps-v1-place-nearby/llms.txt)
- [ReefAPI: company discovery API pricing, 11 plans, POST /google-maps/v1/place/search](https://datacircle.dev/company-discovery-apis/reefapi/free-free-post-google-maps-v1-place-search/llms.txt)
- [ReefAPI: LinkedIn company data API pricing, 11 plans](https://datacircle.dev/linkedin-company-profile-apis/reefapi/free/llms.txt)
- [ReefAPI: LinkedIn job details API pricing, 11 plans](https://datacircle.dev/linkedin-job-details-apis/reefapi/free/llms.txt)
- [ReefAPI: similar jobs API pricing, 11 plans](https://datacircle.dev/similar-job-apis/reefapi/free/llms.txt)
- [ReefAPI: LinkedIn job search API pricing, 11 plans](https://datacircle.dev/linkedin-job-search-apis/reefapi/free/llms.txt)
- [ReefAPI: email verification API pricing, 11 plans](https://datacircle.dev/validate-email-apis/reefapi/free/llms.txt)
- [ReefAPI: Trustpilot review API pricing, 11 plans](https://datacircle.dev/trustpilot-review-apis/reefapi/free/llms.txt)
- [ReefAPI: phone validation API pricing, 11 plans, POST /phone-validate/v1/batch](https://datacircle.dev/validate-phone-apis/reefapi/free-post-phone-validate-v1-batch/llms.txt)
- [ReefAPI: phone validation API pricing, 11 plans, POST /phone-validate/v1/validate](https://datacircle.dev/validate-phone-apis/reefapi/free-post-phone-validate-v1-validate/llms.txt)
- [ReefAPI: SERP API pricing, 11 plans, POST /bing/v1/search](https://datacircle.dev/serp-apis/reefapi/free-free-post-bing-v1-search/llms.txt)
- [ReefAPI: SERP API pricing, 11 plans, POST /bing/v1/videos](https://datacircle.dev/serp-apis/reefapi/free-free-post-bing-v1-videos/llms.txt)

## ReefAPI: email verification API alternatives

- [StopReg, $20 monthly](https://datacircle.dev/validate-email-apis/stopreg/20-monthly/llms.txt): $0.333 per 1,000, 50% complete, stored
- [Elastic Email, $169 monthly, Email API Starter (500,000 emails/month), POST /verifications/files](https://datacircle.dev/validate-email-apis/elastic-email/169-monthly-email-api-starter-500000-emails-month-post-verifications-files/llms.txt): $0.338 per 1,000, 50% complete, stored
- [MailSift, $35 pack, Growth, GET /verify, Verify one email](https://datacircle.dev/validate-email-apis/mailsift/35-pack-growth-get-verify-verify-one-email/llms.txt): $0.35 per 1,000, 67% complete, stored (MX, SPF, DMARC: live)
- [Emailit, $2,400 yearly, Business, POST /email-verifications, Verify an address](https://datacircle.dev/validate-email-apis/emailit/2400-yearly-business-post-email-verifications-verify-an-address/llms.txt): $0.40 per 1,000, 67% complete, stored (has MX records: 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 2026-10-27.

- https://reefapi.com
- https://reefapi.com/_next/static/chunks/app/pricing/page-560e08c02e869119.js
- https://reefapi.com/docs
- https://reefapi.com/docs/validate.md
- https://reefapi.com/pricing
- https://reefapi.com/refunds
- https://reefapi.com/terms