# NexMailPro, free, POST /verify/email: Email verification API

> Integrate real-time email validation directly into your application, signup forms, CRM, internal tools, or SaaS workflow. Use the NexMailPro API to verify emails, reduce bad data, and improve deliverability before invalid addresses affect your system.

NexMailPro'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, Confidence.
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/nexmailpro/free-post-verify-email
- [Best email verification API in 2026](https://datacircle.dev/best-email-verification-api.txt)
- Get it: https://nexmailpro.com/pricing
- Request: `POST https://nexmailpro.com/api/v1/verify/email`
- API key: with the plan, on https://nexmailpro.com/pricing
- Its API docs: https://nexmailpro.com/docs/api#single
- Sold by: NexMailPro (https://nexmailpro.com)
- Checked: 2026-10-28

## In the answer

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

## Price

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

## Aggregators

- Aggregators: none

## Charges

- Also pays for: from the same budget: Bulk verification upload

## Overage

- Units cap: hard

## Not found

- $ per 1,000: $0.00

## In their words

- Their pitch: Integrate real-time email validation directly into your application, signup forms, CRM, internal tools, or SaaS workflow. Use the NexMailPro API to verify emails, reduce bad data, and improve deliverability before invalid addresses affect your system.

## Data

- Freshness: stored
- What it checks: format, mail servers
- Keep data: no limit
- Use data: You agree to use NexMailPro only for lawful, legitimate purposes. You must not misuse the platform, interfere with its operation, attempt unauthorized access, or use it for spam, fraud, abuse, or illegal activity. Do not submit data you do not have the right to process. Do not attempt to bypass rate limits, quotas, or security controls. Do not use the service to send abusive or deceptive campaigns. Do not reverse engineer, scrape, or disrupt platform functionality.

## Plan

- Pay: $0
- You get: 1,000 credits
- Enough for: 1,000 calls

## Rate limit

- Batch: 1

## Speed

- Answer: in the call

## The call

- You send: email
- Method: POST
- Path: /verify/email

## About the plan

- Plan: Free
- Who can get it: anyone

## The 10 fields the plan's answer can hold

success, message, email address, status, sub-status, score, syntax valid, MX record, domain exists, credits charged

## NexMailPro's plans (14)

- [NexMailPro, free, POST /verify/email](https://datacircle.dev/validate-email-apis/nexmailpro/free-post-verify-email/llms.txt): $0.00 per 1,000, 50% complete, stored
- [NexMailPro, $9 pack, Starter Top-Up, POST /verify/email](https://datacircle.dev/validate-email-apis/nexmailpro/9-pack-starter-top-up-post-verify-email/llms.txt): $1.80 per 1,000, 50% complete, stored
- [NexMailPro, $15 pack, Growth Top-Up, POST /verify/email](https://datacircle.dev/validate-email-apis/nexmailpro/15-pack-growth-top-up-post-verify-email/llms.txt): $1.50 per 1,000, 50% complete, stored
- [NexMailPro, $30 pack, Scale Top-Up, POST /verify/email](https://datacircle.dev/validate-email-apis/nexmailpro/30-pack-scale-top-up-post-verify-email/llms.txt): $1.20 per 1,000, 50% complete, stored
- [NexMailPro, $49 pack, Volume Top-Up, POST /verify/email](https://datacircle.dev/validate-email-apis/nexmailpro/49-pack-volume-top-up-post-verify-email/llms.txt): $0.98 per 1,000, 50% complete, stored
- [NexMailPro, $15 monthly, Starter, POST /verify/email](https://datacircle.dev/validate-email-apis/nexmailpro/15-monthly-starter-post-verify-email/llms.txt): $1.50 per 1,000, 50% complete, stored
- [NexMailPro, $19 monthly, API, POST /verify/email](https://datacircle.dev/validate-email-apis/nexmailpro/19-monthly-api-post-verify-email/llms.txt): 50% complete, stored
- [NexMailPro, $29 monthly, Pro, POST /verify/email](https://datacircle.dev/validate-email-apis/nexmailpro/29-monthly-pro-post-verify-email/llms.txt): $0.58 per 1,000, 50% complete, stored
- [NexMailPro, $79 monthly, Business, POST /verify/email](https://datacircle.dev/validate-email-apis/nexmailpro/79-monthly-business-post-verify-email/llms.txt): $0.527 per 1,000, 50% complete, stored
- [NexMailPro, $150 yearly, Starter, POST /verify/email](https://datacircle.dev/validate-email-apis/nexmailpro/150-yearly-starter-post-verify-email/llms.txt): $1.25 per 1,000, 50% complete, stored
- [NexMailPro, $190 yearly, API, POST /verify/email](https://datacircle.dev/validate-email-apis/nexmailpro/190-yearly-api-post-verify-email/llms.txt): 50% complete, stored
- [NexMailPro, $290 yearly, Pro, POST /verify/email](https://datacircle.dev/validate-email-apis/nexmailpro/290-yearly-pro-post-verify-email/llms.txt): $0.483 per 1,000, 50% complete, stored
- [NexMailPro, $790 yearly, Business, POST /verify/email](https://datacircle.dev/validate-email-apis/nexmailpro/790-yearly-business-post-verify-email/llms.txt): $0.439 per 1,000, 50% complete, stored
- [NexMailPro, contact us, Enterprise, POST /verify/email](https://datacircle.dev/validate-email-apis/nexmailpro/contact-us-enterprise-post-verify-email/llms.txt): 50% complete, stored

## NexMailPro's calls (2)

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

## NexMailPro's APIs (1)

- [NexMailPro: email verification API pricing, 14 plans, POST /verify/email](https://datacircle.dev/validate-email-apis/nexmailpro/free-post-verify-email/llms.txt)

## NexMailPro: email verification API alternatives

- [UserCheck, $500 monthly, Pro 3.5M, POST /v1/gates/{gate_id}/decisions, Decision endpoint, full](https://datacircle.dev/validate-email-apis/usercheck/500-monthly-pro-3-5m-post-v1-gates-gate-id-decisions-decision-endpoint-full/llms.txt): $0.429 per 1,000, 50% complete, stored
- [Elastic Email, $189 monthly, Email API Pro (400,000 emails/month), POST /verifications/files](https://datacircle.dev/validate-email-apis/elastic-email/189-monthly-email-api-pro-400000-emails-month-post-verifications-files/llms.txt): $0.472 per 1,000, 50% complete, stored
- [KaijuVerifier, $1,430.04 yearly, Scale, POST /api/v1/jobs, Submit an async bulk job](https://datacircle.dev/validate-email-apis/kaijuverifier/1430-04-yearly-scale-post-api-v1-jobs-submit-an-async-bulk-job/llms.txt): $0.477 per 1,000, 50% complete, stored
- [IsItDisposable, $1,430 yearly, Pro, POST /v1/check](https://datacircle.dev/validate-email-apis/isitdisposable/1430-yearly-pro-post-v1-check/llms.txt): $0.477 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 2026-10-28.

- https://nexmailpro.com
- https://nexmailpro.com/api
- https://nexmailpro.com/docs/api
- https://nexmailpro.com/email-validation-for-developers
- https://nexmailpro.com/features
- https://nexmailpro.com/pricing
- https://nexmailpro.com/privacy-policy
- https://nexmailpro.com/register
- https://nexmailpro.com/terms-of-service
- https://nexmailpro.com/user-guide/how-to-use-nexmailpro