# Uniserv, free: Email verification API

> With the E-Mail validation of Uniserv, you check the format and structure of each individual address element. As well as checking syntax, it also confirms the existence of the addressed domain and ensures that the addressee has an E-Mail account in the domain.

Uniserv's Free test requests plan for the email verification API costs $0.00 per 1,000 emails. We check each provider's docs for 6 fields. Uniserv's docs list 2: Address, Deliverability.
We haven't run Uniserv through [our email verification API benchmark](https://datacircle.dev/best-email-verification-api.txt) yet.
This plan is free. We rank 4,391 plans for email verification APIs by price. Half the plans cost $2.00 or less per 1,000 emails. [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. [StableEnrich's pay-as-you-go plan](https://datacircle.dev/validate-email-apis/stableenrich/pay-as-you-go-pay-per-request-with-x402-or-mpp-post-api-minerva-validate-emails/llms.txt) costs the least for 10,000 emails a month: $0.05.
[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), [Validemail.co](https://datacircle.dev/validate-email-apis/validemail-co/9-90-monthly-9-90-month-get-api-v1-validate/llms.txt) and [looot](https://datacircle.dev/validate-email-apis/looot/top-up/llms.txt) are the best email verification API providers in the Datacircle benchmark.

- This page: https://datacircle.dev/validate-email-apis/uniserv/free
- [Email validation API: best verification providers compared](https://datacircle.dev/best-email-verification-api.txt)
- Get it: https://connect.uniserv.com/registration?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- Request: `POST https://api.uniserv.com/email/v2/validate`
- API key: with the plan, on https://connect.uniserv.com/registration?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- Its API docs: https://docs.uniserv.com/services/email/cloud/2.0/openAPI/email?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- Sold by: Uniserv (https://www.uniserv.com?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing)
- Checked: 2026-11-09

## In the answer

- Completeness: 33%
- Address: ✓
- Deliverability: ✓

## Price

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

## Aggregators

- Aggregators: none

## Overage

- Units cap: hard

## Not found

- $ per 1,000: $0.00

## Catch-all

- $ per 1,000: $0.00

## In their words

- Their pitch: With the E-Mail validation of Uniserv, you check the format and structure of each individual address element. As well as checking syntax, it also confirms the existence of the addressed domain and ensures that the addressee has an E-Mail account in the domain.

## Data

- Freshness: live
- What it checks: format, mail servers, disposable domains, role addresses, mailbox
- Keep data: no limit
- Use data: The User may use the Application to process their data. [...] In the event of the copyright interests of UNISERV as Provider or Third Party being affected, the User will be granted an uncomplicated, non-transferable right of use limited to the duration of the Contract (simple licence). Granting of sub-licences is not permitted.

## Plan

- Pay: $0
- You get: 100 requests
- Enough for: 100 calls, once

## Rate limit

- Per second: 15
- Batch: 1

## Speed

- Answer: in the call

## The call

- You send: email. Optional: _options
- Method: POST
- Path: /email/v2/validate

## About the plan

- Plan: Free test requests
- Who can get it: anyone

## The 11 fields the plan's answer can hold

email, deliverable, reason, freemailer, disposable, accept all, role, full mailbox, disabled, DNS record type, DNS record

## Uniserv's plans (3)

- [Uniserv, free](https://datacircle.dev/validate-email-apis/uniserv/free/llms.txt): $0.00 per 1,000, 33% complete, live
- [Uniserv, contact us, Pay-as-you-go](https://datacircle.dev/validate-email-apis/uniserv/contact-us-pay-as-you-go/llms.txt): 33% complete, live
- [Uniserv, contact us, Subscription](https://datacircle.dev/validate-email-apis/uniserv/contact-us-subscription/llms.txt): 33% complete, live

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

- `POST /email/v2/validate`: [Uniserv, free](https://datacircle.dev/validate-email-apis/uniserv/free/llms.txt)

## Uniserv's APIs (2)

- [Uniserv: email verification API pricing, 3 plans](https://datacircle.dev/validate-email-apis/uniserv/free/llms.txt)
- [Uniserv: phone validation API pricing, 3 plans](https://datacircle.dev/validate-phone-apis/uniserv/free/llms.txt)

## Uniserv: email verification API alternatives

- [Validemail.co, free, POST /api/v1/bulk](https://datacircle.dev/validate-email-apis/validemail-co/free-post-api-v1-bulk/llms.txt): $0.00 per 1,000, 67% complete, live
- [MailTester Ninja, free, No token](https://datacircle.dev/validate-email-apis/mailtester-ninja/free-no-token/llms.txt): $0.00 per 1,000, 50% complete, live
- [Giggal, free trial, POST /v1/verify-batch](https://datacircle.dev/validate-email-apis/giggal/free-trial-post-v1-verify-batch/llms.txt): $0.00 per 1,000, 67% complete, live
- [Enrich.so, free, POST /email-validation](https://datacircle.dev/validate-email-apis/enrich-so/free/llms.txt): $0.00 per 1,000, 50% complete, live
- [QubitOn, free](https://datacircle.dev/validate-email-apis/qubiton/free/llms.txt): $0.00 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 2026-11-09.

- https://connect.uniserv.com?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://connect.uniserv.com/registration?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://docs.uniserv.com/apikey?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://docs.uniserv.com/services/email/cloud/2.0?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://docs.uniserv.com/services/email/cloud/2.0/email/billing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://docs.uniserv.com/services/email/cloud/2.0/email/data-enrichment?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://docs.uniserv.com/services/email/cloud/2.0/email/data-model?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://docs.uniserv.com/services/email/cloud/2.0/general/problems?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://docs.uniserv.com/services/email/cloud/2.0/openAPI/email?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://documents.connect.uniserv.com/UniservCloudGeneralTermsConditions_en.pdf?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://www.uniserv.com/en/software/email-address-check?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing