# IsTempMail, free: Email verification API

> IsTempMail is a real-time HTTP API that verifies whether an email address or domain is disposable, temporary, or otherwise unresolvable. It is built for sign-up forms, lead capture, payment flows, and anywhere you accept an email address from a user

IsTempMail's email verification API on its Free plan. It costs $0.00 per 1,000 emails. It returns 2 of the 6 key fields we check: Deliverability, Company.
In [our email verification API benchmark](https://datacircle.dev/best-email-verification-api.txt), the best plan from IsTempMail scores 0.0 out of 100. IsTempMail ranks 160th of 181 providers.
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/istempmail/free
- [Email validation API: 180+ verification providers compared](https://datacircle.dev/best-email-verification-api.txt)
- Get it: https://www.istempmail.com/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- Request: `GET https://www.istempmail.com/api/check/{name}`
- API key: with the plan, on https://www.istempmail.com/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- Its API docs: https://www.istempmail.com/docs/api?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing#check
- Sold by: IsTempMail (https://www.istempmail.com?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing)
- Checked: 2026-11-02

## In the answer

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

## Price

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

## Aggregators

- Aggregators: none

## Charges

- Repeat free: never
- Also pays for: from the same budget: Report a suspicious domain

## Overage

- Units cap: hard

## Not found

- $ per 1,000: $0.00

## Catch-all

- $ per 1,000: $0.00

## In their words

- Their pitch: IsTempMail is a real-time HTTP API that verifies whether an email address or domain is disposable, temporary, or otherwise unresolvable. It is built for sign-up forms, lead capture, payment flows, and anywhere you accept an email address from a user

## Data

- Freshness: 24 hours
- What it checks: mail servers, disposable domains
- Keep data: no limit
- Use data: any

## Plan

- Pay: $0
- You get: 200 requests a month
- Enough for: 200 calls a month
- Expires: unused limits do not roll over to the next period

## Rate limit

- Concurrent: no limit
- Batch: 1

## Speed

- Answer: in the call

## The call

- You send: name
- Method: GET
- Path: /check/{name}

## About the plan

- Plan: Free
- Who can get it: anyone aged 13 or over (a minor with a parent or guardian's permission)

## The 3 fields the plan's answer can hold

domain, blocked, unresolvable

## IsTempMail's plans (6)

- [IsTempMail, free](https://datacircle.dev/validate-email-apis/istempmail/free/llms.txt): $0.00 per 1,000, 33% complete, 24 hours
- [IsTempMail, $5 monthly](https://datacircle.dev/validate-email-apis/istempmail/5-monthly/llms.txt): $1.00 per 1,000, 33% complete, 24 hours
- [IsTempMail, $10 monthly](https://datacircle.dev/validate-email-apis/istempmail/10-monthly/llms.txt): $0.667 per 1,000, 33% complete, 24 hours
- [IsTempMail, $20 monthly](https://datacircle.dev/validate-email-apis/istempmail/20-monthly/llms.txt): $0.40 per 1,000, 33% complete, 24 hours
- [IsTempMail, $50 monthly](https://datacircle.dev/validate-email-apis/istempmail/50-monthly/llms.txt): no limit, 33% complete, 24 hours
- [IsTempMail, contact us](https://datacircle.dev/validate-email-apis/istempmail/contact-us/llms.txt): 33% complete, 24 hours

## IsTempMail's calls (1)

- `GET /check/{name}`: [IsTempMail, free](https://datacircle.dev/validate-email-apis/istempmail/free/llms.txt)

## IsTempMail's APIs (1)

- [IsTempMail: email verification API pricing, 6 plans](https://datacircle.dev/validate-email-apis/istempmail/free/llms.txt)

## IsTempMail: email verification API alternatives

- [BillionVerify, $200 pack, Enterprise, POST /verify/bulk](https://datacircle.dev/validate-email-apis/billionverify/200-pack-enterprise-post-verify-bulk/llms.txt): $0.40 per 1,000, 67% complete, live
- [Sealch, $240 yearly, Yearly up to 50,000 / mo, POST /api/verify](https://datacircle.dev/validate-email-apis/sealch/240-yearly-yearly-up-to-50000-mo-post-api-verify/llms.txt): $0.40 per 1,000, 17% complete, live
- [HeroBounce, $200 monthly, Pro, POST /validation/single](https://datacircle.dev/validate-email-apis/herobounce/200-monthly-pro-post-validation-single/llms.txt): $0.40 per 1,000, 67% complete, live
- [Verimail, $1,000 pack](https://datacircle.dev/validate-email-apis/verimail/1000-pack/llms.txt): $0.40 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 2026-11-02.

- https://www.istempmail.com?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://www.istempmail.com/docs/api?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://www.istempmail.com/legal/terms-of-service?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://www.istempmail.com/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing