# QubitOn, free: Email verification API

> Verify email deliverability and detect fraud in real time

QubitOn'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 ran QubitOn in [our email verification API benchmark](https://datacircle.dev/best-email-verification-api.txt). We didn't score any QubitOn plan.
This plan is free. We rank 3,753 plans for email verification APIs by price. Half the plans cost $1.98 per 1,000 emails or less.
[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.
[MailTester Ninja](https://datacircle.dev/validate-email-apis/mailtester-ninja/23-99-monthly/llms.txt), [Enrich.so](https://datacircle.dev/validate-email-apis/enrich-so/499-monthly/llms.txt) and [GetProspect](https://datacircle.dev/validate-email-apis/getprospect/369-pack/llms.txt) are the best email verification API providers in the Datacircle benchmark.

- This page: https://datacircle.dev/validate-email-apis/qubiton/free
- [Email validation API: 180+ verification providers compared](https://datacircle.dev/best-email-verification-api.txt)
- Get it: https://www.qubiton.com/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- Request: `POST https://www.qubiton.com/api/email/validate`
- API key: with the plan, on https://www.qubiton.com/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- Its API docs: https://www.qubiton.com/docs.md?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- Sold by: QubitOn (https://www.qubiton.com?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing)
- Checked: 2026-11-05

## In the answer

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

## Price

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

## Aggregators

- Aggregators: none

## Overage

- $ per 1,000 emails: $1,500.00

## Not found

- $ per 1,000: $0.00

## In their words

- Their pitch: Verify email deliverability and detect fraud in real time

## Data

- Freshness: live
- What it checks: format, mail servers, disposable domains, role addresses, mailbox
- Keep data: no API terms
- Use data: no API terms

## Plan

- Pay: $0
- You get: 100 requests a month
- Enough for: 100 calls a month

## Rate limit

- Per second: 0.17
- Batch: 1

## Speed

- Answer: in the call

## The call

- You send: emailAddress, requestedByClient. Optional: sourceUniqueId, qubitOnUniqueId, requestedByApplication, requestedByApplicationUrl, requestedByIPAddress, emailType
- Method: POST
- Path: /api/email/validate

## About the plan

- Plan: Free
- Who can get it: anyone

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

source unique ID, QubitOn unique ID, score, validation result code, source result code, validation pass, validation description, validation date, validation type, validation sub-type, additional info, email type, email address, fraud score

## QubitOn's plans (2)

- [QubitOn, free](https://datacircle.dev/validate-email-apis/qubiton/free/llms.txt): $0.00 per 1,000, 50% complete, live
- [QubitOn, contact us](https://datacircle.dev/validate-email-apis/qubiton/contact-us/llms.txt): 50% complete, live

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

- `POST /api/email/validate`: [QubitOn, free](https://datacircle.dev/validate-email-apis/qubiton/free/llms.txt)

## QubitOn's APIs (5)

- [QubitOn: email verification API pricing, 2 plans](https://datacircle.dev/validate-email-apis/qubiton/free/llms.txt)
- [QubitOn: phone validation API pricing, 2 plans](https://datacircle.dev/validate-phone-apis/qubiton/free/llms.txt)
- [QubitOn: business verification API pricing, 2 plans, POST /api/babusinessregistration/lookup](https://datacircle.dev/business-verification-apis/qubiton/free-post-api-babusinessregistration-lookup/llms.txt)
- [QubitOn: business verification API pricing, 2 plans, POST /api/businessregistration/lookup](https://datacircle.dev/business-verification-apis/qubiton/free-post-api-businessregistration-lookup/llms.txt)
- [QubitOn: business verification API pricing, 2 plans, POST /api/cabusinessregistration/lookup](https://datacircle.dev/business-verification-apis/qubiton/free-post-api-cabusinessregistration-lookup/llms.txt)
- [QubitOn: business verification API pricing, 2 plans, POST /api/canonprofit/lookup](https://datacircle.dev/business-verification-apis/qubiton/free-post-api-canonprofit-lookup/llms.txt)
- [QubitOn: business verification API pricing, 2 plans, POST /api/cnbusinessregistration/lookup](https://datacircle.dev/business-verification-apis/qubiton/free-post-api-cnbusinessregistration-lookup/llms.txt)
- [QubitOn: business verification API pricing, 2 plans, POST /api/cobusinessregistration/lookup](https://datacircle.dev/business-verification-apis/qubiton/free-post-api-cobusinessregistration-lookup/llms.txt)
- [QubitOn: business verification API pricing, 2 plans, POST /api/czbusinessregistration/lookup](https://datacircle.dev/business-verification-apis/qubiton/free-post-api-czbusinessregistration-lookup/llms.txt)
- [QubitOn: business verification API pricing, 2 plans, POST /api/debusinessregistration/lookup](https://datacircle.dev/business-verification-apis/qubiton/free-post-api-debusinessregistration-lookup/llms.txt)
- [QubitOn: business verification API pricing, 2 plans, POST /api/hubusinessregistration/lookup](https://datacircle.dev/business-verification-apis/qubiton/free-post-api-hubusinessregistration-lookup/llms.txt)
- [QubitOn: business verification API pricing, 2 plans, POST /api/ilbusinessregistration/lookup](https://datacircle.dev/business-verification-apis/qubiton/free-post-api-ilbusinessregistration-lookup/llms.txt)
- [QubitOn: business verification API pricing, 2 plans, POST /api/jpbusinessregistration/lookup](https://datacircle.dev/business-verification-apis/qubiton/free-post-api-jpbusinessregistration-lookup/llms.txt)
- [QubitOn: business verification API pricing, 2 plans, POST /api/nzbusinessregistration/lookup](https://datacircle.dev/business-verification-apis/qubiton/free-post-api-nzbusinessregistration-lookup/llms.txt)
- [QubitOn: business verification API pricing, 2 plans, POST /api/nobusinessregistration/lookup](https://datacircle.dev/business-verification-apis/qubiton/free-post-api-nobusinessregistration-lookup/llms.txt)
- [QubitOn: business verification API pricing, 2 plans, POST /api/plbusinessregistration/lookup](https://datacircle.dev/business-verification-apis/qubiton/free-post-api-plbusinessregistration-lookup/llms.txt)
- [QubitOn: business verification API pricing, 2 plans, POST /api/sgbusinessregistration/lookup](https://datacircle.dev/business-verification-apis/qubiton/free-post-api-sgbusinessregistration-lookup/llms.txt)
- [QubitOn: business verification API pricing, 2 plans, POST /api/sebusinessregistration/lookup](https://datacircle.dev/business-verification-apis/qubiton/free-post-api-sebusinessregistration-lookup/llms.txt)
- [QubitOn: business verification API pricing, 2 plans, POST /api/chbusinessregistration/lookup](https://datacircle.dev/business-verification-apis/qubiton/free-post-api-chbusinessregistration-lookup/llms.txt)
- [QubitOn: business verification API pricing, 2 plans, POST /api/ukbusinessregistration/lookup](https://datacircle.dev/business-verification-apis/qubiton/free-post-api-ukbusinessregistration-lookup/llms.txt)
- [QubitOn: business verification API pricing, 2 plans, POST /api/usbusinessregistration/lookup](https://datacircle.dev/business-verification-apis/qubiton/free-post-api-usbusinessregistration-lookup/llms.txt)
- [QubitOn: business verification API pricing, 2 plans, POST /api/vnbusinessregistration/lookup](https://datacircle.dev/business-verification-apis/qubiton/free-post-api-vnbusinessregistration-lookup/llms.txt)
- [QubitOn: company enrichment API pricing, 1 plan](https://datacircle.dev/company-enrichment-apis/qubiton/contact-us/llms.txt)
- [QubitOn: company hierarchy API pricing, 1 plan, POST /api/corporatehierarchy/lookup](https://datacircle.dev/company-hierarchy-apis/qubiton/contact-us-enterprise-post-api-corporatehierarchy-lookup/llms.txt)
- [QubitOn: company hierarchy API pricing, 1 plan, POST /api/company/hierarchy/lookup](https://datacircle.dev/company-hierarchy-apis/qubiton/contact-us-enterprise-post-api-company-hierarchy-lookup/llms.txt)

## QubitOn: email verification API alternatives

- [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
- [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
- [GetProspect, free, POST /v2/email-verifications](https://datacircle.dev/validate-email-apis/getprospect/free-free-post-v2-email-verifications/llms.txt): $0.00 per 1,000, 50% complete, live
- [Sealch, free, POST /api/verify](https://datacircle.dev/validate-email-apis/sealch/free-free-post-api-verify/llms.txt): $0.00 per 1,000, 17% complete, live
- [MailInput, free](https://datacircle.dev/validate-email-apis/mailinput/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 2026-11-05.

- https://www.qubiton.com/api/portal/openapi.json?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://www.qubiton.com/capabilities.md?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://www.qubiton.com/docs.md?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://www.qubiton.com/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://www.qubiton.com/pricing.md?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://www.qubiton.com/products/email-verification?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing