# MailTester Ninja, free, No token: Email verification API

> Checks in real time whether an email address exists and can receive mail, by asking the recipient's mail server. No message is sent.

MailTester Ninja's email verification API on its No token plan. It costs $0.00 per 1,000 emails. It returns 3 of the 6 key fields we check: Address, Deliverability, Company.
You get up to 300 calls a month.
We rank 3,214 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 $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), [Signaliz](https://datacircle.dev/validate-email-apis/signaliz/top-up/llms.txt) and [Enrich.so](https://datacircle.dev/validate-email-apis/enrich-so/149-monthly/llms.txt) are the best email verification API providers in our benchmark.

- This page: https://datacircle.dev/validate-email-apis/mailtester-ninja/free-no-token
- [Best email verification API in 2026: providers compared](https://datacircle.dev/best-email-verification-api.txt)
- Get it: https://mailtester.ninja/verify-emails-unlimited/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- Request: `GET https://happy.mailtester.ninja/ninja`
- API key: with the plan, on https://mailtester.ninja/verify-emails-unlimited/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- Its API docs: https://mailtester.ninja/api/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing#verifier-api
- Sold by: MailTester Ninja (https://mailtester.ninja?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing)
- Checked: 2026-11-02

## In the answer

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

## 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: Checks in real time whether an email address exists and can receive mail, by asking the recipient's mail server. No message is sent.

## Data

- Freshness: live
- What it checks: mail servers, disposable domains, mailbox
- Keep data: no limit
- Use data: You may use the Service only to verify email addresses that you have a legitimate reason to check [...] You must comply with all applicable laws, including anti-spam and data-protection laws (such as the UK GDPR, EU GDPR and the US CAN-SPAM Act). You must not, and must not allow anyone else to: Directory harvesting / dictionary attacks — submitting generated, guessed, sequential or otherwise fabricated addresses in order to discover which ones exist on a domain. Verify purchased, scraped, rented or otherwise non-consented email lists, or use the Service to enable the sending of unsolicited bulk email (spam), phishing or malware. Use the Service to harass, defraud, or target individuals, or for any unlawful, deceptive or harmful purpose. Circumvent, disable or exceed rate limits or plan quotas, share, resell, sublicense or redistribute the Service or your API key without our written consent. Reverse-engineer, scrape, or attempt to derive the underlying methods of the Service, or interfere with its normal operation.

## Plan

- Pay: $0
- Enough for: 300 calls a month

## Rate limit

- Per day: 10
- Per second: 0.033
- Batch: 1

## Speed

- Answer: in the call
- Median: 1.07 s

## The call

- You send: email
- Method: GET
- Path: /ninja

## About the plan

- Plan: No token
- Who can get it: anyone at least 18 years old, or the age of majority in their jurisdiction

## The 9 fields the plan's answer can hold

status, message, email address, user, domain, mail server, connections, daily limit, rate

## MailTester Ninja's plans (4)

- [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
- [MailTester Ninja, free token](https://datacircle.dev/validate-email-apis/mailtester-ninja/free-token/llms.txt): $0.00 per 1,000, 50% complete, live
- [MailTester Ninja, $23.99 monthly](https://datacircle.dev/validate-email-apis/mailtester-ninja/23-99-monthly/llms.txt): $0.008 per 1,000, 50% complete, live
- [MailTester Ninja, $39.99 monthly](https://datacircle.dev/validate-email-apis/mailtester-ninja/39-99-monthly/llms.txt): $0.0067 per 1,000, 50% complete, live

## MailTester Ninja's calls for this API (1)

- `GET /ninja`: [MailTester Ninja, free, No token](https://datacircle.dev/validate-email-apis/mailtester-ninja/free-no-token/llms.txt)

## MailTester Ninja's APIs (2)

- [MailTester Ninja: email verification API pricing, 4 plans](https://datacircle.dev/validate-email-apis/mailtester-ninja/free-no-token/llms.txt)
- [MailTester Ninja: email finder API pricing, 2 plans](https://datacircle.dev/find-email-apis/mailtester-ninja/23-99-monthly/llms.txt)

## MailTester Ninja: email verification API alternatives

- [treg, top-up from $200](https://datacircle.dev/validate-email-apis/treg/top-up-from-200/llms.txt): $0.00 per 1,000, 33% complete, live
- [Unisender Go, ₽547,200 yearly, By invoice, 12 months prepaid, 36,000,000 emails in 12 months, first 100 validations a month](https://datacircle.dev/validate-email-apis/unisender-go/547200-yearly-by-invoice-12-months-prepaid-36000000-emails-in-12-months-first-100-validations-a-month/llms.txt): $0.00 per 1,000, 50% complete, live
- [UniOne, $850 monthly, Standard, 3,000,000 emails a month, first 6,000 validations a month](https://datacircle.dev/validate-email-apis/unione/850-monthly-standard-3000000-emails-a-month-first-6000-validations-a-month/llms.txt): $0.00 per 1,000, 50% complete, live
- [StopBouncing, free](https://datacircle.dev/validate-email-apis/stopbouncing/free/llms.txt): $0.00 per 1,000, 33% complete, live
- [GMass, $349 yearly](https://datacircle.dev/validate-email-apis/gmass/349-yearly/llms.txt): $0.0081 per 1,000, 33% 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 2026-11-02.

- https://mailtester.ninja/api/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://mailtester.ninja/free-email-verification-api/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://mailtester.ninja/openapi.json?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://mailtester.ninja/pricing.json?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://mailtester.ninja/terms-of-use/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://mailtester.ninja/verify-emails-unlimited/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing