# 1xAPI, free: Email verification API

> Enterprise-grade email verification API. Validate email addresses in real-time with MX record checks, SMTP verification, disposable email detection, and deliverability scoring.

1xAPI's email verification API on its Basic plan. It costs $0.00 per 1,000 emails. 1xAPI's docs list 2 of the 6 fields on our checklist: Deliverability, Confidence.
We haven't run 1xAPI through [our email verification API benchmark](https://datacircle.dev/best-email-verification-api.txt) yet.
This plan is free. We rank 3,960 plans for email verification APIs by price. Half the plans cost $1.998 per 1,000 emails or less. [See the best free email verification API plan.](https://datacircle.dev/best-email-verification-api.txt)
[treg's top-up from $10](https://datacircle.dev/validate-email-apis/treg/top-up-from-10/llms.txt) is the cheapest paid plan per 1,000 emails: $0.00 on average. treg asks one provider after another until one answers. You pay $68.365 per 1,000 emails when no provider answers.
[Disify's $9 monthly plan (/email)](https://datacircle.dev/validate-email-apis/disify/9-monthly-starter-post-email/llms.txt) covers any number of emails. Disify's $9 monthly plan costs less up front than treg's top-up from $10.
[pingutil](https://datacircle.dev/validate-email-apis/pingutil/free-api-key-post-v1-verify/llms.txt), [MailTester Ninja](https://datacircle.dev/validate-email-apis/mailtester-ninja/23-99-monthly/llms.txt) and [Giggal](https://datacircle.dev/validate-email-apis/giggal/39-pack-50000-credits-post-v1-verify/llms.txt) are the best email verification API providers in the Datacircle benchmark.

- This page: https://datacircle.dev/validate-email-apis/1xapi/free
- [Email validation API: 200+ verification providers compared](https://datacircle.dev/best-email-verification-api.txt)
- Get it: https://1xapi.com/hub/1xapi/email-verify/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- Request: `POST https://p.1xapi.com/email-verify/verify`
- API key: with the plan, on https://1xapi.com/hub/1xapi/email-verify/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- Its API docs: https://1xapi.com/hub/1xapi/email-verify/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- Sold by: 1xAPI (https://1xapi.com?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing)
- Checked: 2026-11-06

## In the answer

- Completeness: 33%
- Deliverability: ✓
- Confidence: ✓

## Price

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

## Aggregators

- Aggregators: none

## Charges

- Also pays for: nothing else

## Not found

- $ per 1,000: $0.00

## In their words

- Their pitch: Enterprise-grade email verification API. Validate email addresses in real-time with MX record checks, SMTP verification, disposable email detection, and deliverability scoring.

## Data

- Freshness: live
- What it checks: mail servers, disposable domains, mailbox
- Keep data: no limit
- Use data: When using APIs through 1xAPI, you agree to: comply with the usage limits of your subscription tier, not attempt to circumvent rate limiting or authentication, not resell, redistribute, or sublicense API access without permission, not use APIs for any illegal, harmful, or abusive purpose, keep your API keys confidential and not share them publicly

## Plan

- Pay: $0
- You get: 500 requests a month
- Enough for: 500 calls a month

## Rate limit

- Batch: 1

## Speed

- Answer: in the call

## The call

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

## About the plan

- Plan: Basic
- Who can get it: anyone with a 1xAPI account, the service is not intended for users under 16

## The 5 fields the plan's answer can hold

valid, deliverability score, disposable, MX record, SMTP check

## 1xAPI's plans (4)

- [1xAPI, free](https://datacircle.dev/validate-email-apis/1xapi/free/llms.txt): $0.00 per 1,000, 33% complete, live
- [1xAPI, $4.99 monthly](https://datacircle.dev/validate-email-apis/1xapi/4-99-monthly/llms.txt): $0.499 per 1,000, 33% complete, live
- [1xAPI, $14.99 monthly](https://datacircle.dev/validate-email-apis/1xapi/14-99-monthly/llms.txt): $0.15 per 1,000, 33% complete, live
- [1xAPI, $49.99 monthly](https://datacircle.dev/validate-email-apis/1xapi/49-99-monthly/llms.txt): $0.10 per 1,000, 33% complete, live

## 1xAPI's calls (1)

- `POST /email-verify/verify`: [1xAPI, free](https://datacircle.dev/validate-email-apis/1xapi/free/llms.txt)

## 1xAPI's APIs (1)

- [1xAPI: email verification API pricing, 4 plans](https://datacircle.dev/validate-email-apis/1xapi/free/llms.txt)

## 1xAPI: email verification API alternatives

- [Email2Verify, $99 monthly](https://datacircle.dev/validate-email-apis/email2verify/99-monthly/llms.txt): $0.099 per 1,000, 33% complete, live
- [VerifyAnyEmail, $49.90 monthly, Scale, POST /v1/verify](https://datacircle.dev/validate-email-apis/verifyanyemail/49-90-monthly-scale-post-v1-verify/llms.txt): $0.10 per 1,000, 67% 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
- [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

## Sources

From each provider's own pricing page and docs, and from what providers tell us. We read this row from these pages on 2026-11-06.

- https://1xapi.com/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://1xapi.com/hub/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://1xapi.com/hub/1xapi/email-verify/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://1xapi.com/privacy/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://1xapi.com/terms/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing