# Signitize, free: Email verification API

> Stop fake, duplicate and throwaway signups with one API call.

Signitize's Free plan for the email verification API costs $0.00 per 1,000 emails. We check each provider's docs for 6 fields. Signitize's docs list 2: Deliverability, Company.
In [our email verification API benchmark](https://datacircle.dev/best-email-verification-api.txt), the best plan from Signitize scores 0.0 out of 100. Signitize ranks 228th of 239 providers.
This plan is free. We rank 4,767 plans for email verification APIs by price. Half the plans cost $2.00 or less per 1,000 emails. [728 email verification API plans on our price sheet are free.](https://datacircle.dev/best-email-verification-api.txt) [pingutil's free plan](https://datacircle.dev/validate-email-apis/pingutil/free-api-key-post-v1-verify/llms.txt) scores highest of the free plans in our benchmark, at 82.3 out of 100.
[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, and costs less up front than treg's top-up from $10.
[Validemail.co](https://datacircle.dev/validate-email-apis/validemail-co/9-90-monthly-9-90-month-get-api-v1-validate/llms.txt), [pingutil](https://datacircle.dev/validate-email-apis/pingutil/free-api-key-post-v1-verify/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/signitize/free
- [Email validation API: best verification providers compared](https://datacircle.dev/best-email-verification-api.txt)
- Get it: https://www.signitize.io/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- Request: `POST https://api.signitize.io/v1/check`
- API key: with the plan, on https://www.signitize.io/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- Its API docs: https://www.signitize.io/docs/api/check-email?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- Sold by: Signitize (https://www.signitize.io?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing)
- Checked: 2026-11-05

## In the answer

- Completeness: 33%
- Deliverability: ✓
- Company: ✓

## Price

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

## Aggregators

- Aggregators: none

## Charges

- Also pays for: nothing else

## Overage

- Units cap: hard

## Not found

- $ per 1,000 calls that find nothing: $0.00

## Catch-all

- $ per 1,000 emails at catch-all domains: $0.00

## In their words

- Their pitch: Stop fake, duplicate and throwaway signups with one API call.

## Data

- Freshness: 1 hour
- What it checks: format, mail servers, disposable domains
- Keep data: no limit
- Use data: Do not: check addresses you have no lawful reason to process, or use the Service to build, clean or verify mailing lists, use the Service for anything other than checking signups to your own products and services, resell, white-label or give others access to the Service or its results, or share a key between several businesses, unless we agree in writing, get around limits (for example with several accounts), attack, overload, reverse engineer or probe the Service

## Plan

- Pay: $0
- You get: 2,500 credits a month
- Enough for: 2,500 calls a month
- Expires: never: unused checks do not carry over

## Rate limit

- Batch: 1

## Speed

- Answer: in the call

## The call

- You send: email
- Method: POST
- Path: /v1/check

## About the plan

- Plan: Free
- Who can get it: anyone checking the signups of their own products and services

## The 8 fields the plan's answer can hold

canonical email, disposable, deliverable, privacy relay, mail provider, companies that saw the inbox disguised, domain registration date, alias tricks

## Signitize's plans (4)

- [Signitize, free](https://datacircle.dev/validate-email-apis/signitize/free/llms.txt): $0.00 per 1,000, 33% complete, 1 hour
- [Signitize, $29 pack, Premium (30 days), POST /v1/check](https://datacircle.dev/validate-email-apis/signitize/29-pack-premium-30-days-post-v1-check/llms.txt): $0.29 per 1,000, 33% complete, 1 hour
- [Signitize, $290 yearly, Premium (365 days), POST /v1/check](https://datacircle.dev/validate-email-apis/signitize/290-yearly-premium-365-days-post-v1-check/llms.txt): $0.242 per 1,000, 33% complete, 1 hour
- [Signitize, contact us, Enterprise, POST /v1/check](https://datacircle.dev/validate-email-apis/signitize/contact-us-enterprise-post-v1-check/llms.txt): 33% complete, 1 hour

## Signitize's calls (2)

- `POST /v1/check`: [Signitize, free](https://datacircle.dev/validate-email-apis/signitize/free/llms.txt)
- `POST /v1/check/batch`: [Signitize, $29 pack, Premium (30 days), POST /v1/check/batch](https://datacircle.dev/validate-email-apis/signitize/29-pack-premium-30-days-post-v1-check-batch/llms.txt)

## Signitize's APIs (1)

- [Signitize Email verification API pricing, 4 plans](https://datacircle.dev/validate-email-apis/signitize/free/llms.txt)

## Signitize: email verification API alternatives

[Signitize alternatives: every email verification API provider ranked](https://datacircle.dev/signitize-alternatives.txt)

We list Signitize's cheapest paid plan first. Next we list other providers' plans closest to Signitize in price per 1,000 emails. Each plan in the list gives live data or data at most an hour old.

- [Signitize, $290 yearly, Premium (365 days), POST /v1/check](https://datacircle.dev/validate-email-apis/signitize/290-yearly-premium-365-days-post-v1-check/llms.txt): $0.242 per 1,000, 33% complete, 1 hour
- [Sealch, $1,430 yearly, Yearly up to 500,000 / mo, POST /api/verify/bulk](https://datacircle.dev/validate-email-apis/sealch/1430-yearly/llms.txt): $0.238 per 1,000, 17% complete, live
- [MailVeri, $599 pack, 2,500,000 credits, POST /verify-mail/](https://datacircle.dev/validate-email-apis/mailveri/599-pack-2500000-credits-post-verify-mail/llms.txt): $0.24 per 1,000, 50% complete, live
- [EmailCheck.org, $6 monthly, Monthly Plan 25K, GET /email/reachability](https://datacircle.dev/validate-email-apis/emailcheck-org/6-monthly-monthly-plan-25k-get-email-reachability/llms.txt): $0.24 per 1,000, 33% complete, live
- [BulkMailCheck, $49 monthly, Growth, GET /verify](https://datacircle.dev/validate-email-apis/bulkmailcheck/49-monthly-growth-get-verify/llms.txt): $0.245 per 1,000, 67% 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.signitize.io/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://www.signitize.io/docs/api/check-batch?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://www.signitize.io/docs/api/check-email?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://www.signitize.io/docs/check-an-email?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://www.signitize.io/docs/clean-user-list?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://www.signitize.io/docs/detection?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://www.signitize.io/docs/legal/terms?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://www.signitize.io/docs/plans-and-billing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://www.signitize.io/docs/rate-limits?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://www.signitize.io/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing