# IsItDisposable, free, POST /v1/check: Email verification API

> Disposable email detection: a drop-in JavaScript snippet and a clean REST API.

IsItDisposable'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, Company.
We rank 2,467 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 $26.95 per 1,000 emails when no provider answers.
[Enrich.so](https://datacircle.dev/validate-email-apis/enrich-so/149-monthly/llms.txt), [GetProspect](https://datacircle.dev/validate-email-apis/getprospect/369-pack/llms.txt) and [treg](https://datacircle.dev/validate-email-apis/treg/top-up-from-10/llms.txt) are the best email verification API providers in our benchmark.

- This page: https://datacircle.dev/validate-email-apis/isitdisposable/free-post-v1-check
- [Best email verification API in 2026](https://datacircle.dev/best-email-verification-api.txt)
- Get it: https://isitdisposable.com/pricing
- Request: `POST https://api.isitdisposable.com/v1/check`
- API key: with the plan, on https://isitdisposable.com/pricing
- Its API docs: https://isitdisposable.com/docs#api-reference
- Sold by: IsItDisposable (https://isitdisposable.com)
- Checked: 2026-10-28

## 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: from the same budget: Check up to 100 emails or domains

## Overage

- Units cap: hard

## Not found

- $ per 1,000: $0.00

## Catch-all

- $ per 1,000: $0.00

## In their words

- Their pitch: Disposable email detection: a drop-in JavaScript snippet and a clean REST API.

## Data

- Freshness: stored
- What it checks: mail servers, disposable domains, role addresses
- Keep data: no limit
- Use data: A limited, non-exclusive, non-transferable, revocable license to use the Service (including the provided JavaScript snippet) [...] solely for your own internal business purposes, in accordance with these Terms. Any other use requires our prior written consent. You agree not to: Submit email addresses that you do not have a legitimate right or reason to check. You must have collected those addresses lawfully and must have a valid business purpose for verifying them, Resell, redistribute, or sublicense the detection data or verdicts returned by the Service to third parties without our prior written permission, Scrape or systematically harvest verdicts in order to build a competing detection dataset, Attempt to circumvent, reverse-engineer, or exploit the detection logic, algorithms, or infrastructure of the Service, Exceed rate limits, intentionally overload our systems, or use the Service in a way that degrades performance for other customers, Use the Service to facilitate fraud, spam, harassment, or any other unlawful activity.

## Plan

- Pay: $0
- You get: 250 requests a month
- Enough for: 250 calls a month

## Rate limit

- Batch: 1

## Speed

- Answer: in the call

## The call

- You send: at least one of email or domain
- Method: POST
- Path: /v1/check

## About the plan

- Plan: Free
- Who can get it: anyone signing up with a valid, non-disposable, deliverable email address

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

checked, normalized email, domain, disposable, MX valid, role account, relay, public domain, spam risk, MX masked, did you mean, MX records, action, reason

## IsItDisposable's plans (8)

- [IsItDisposable, free, POST /v1/check](https://datacircle.dev/validate-email-apis/isitdisposable/free-post-v1-check/llms.txt): $0.00 per 1,000, 50% complete, stored
- [IsItDisposable, $19 monthly, Starter, POST /v1/check](https://datacircle.dev/validate-email-apis/isitdisposable/19-monthly-starter-post-v1-check/llms.txt): $1.90 per 1,000, 50% complete, stored
- [IsItDisposable, $49 monthly, Growth, POST /v1/check](https://datacircle.dev/validate-email-apis/isitdisposable/49-monthly-growth-post-v1-check/llms.txt): $0.98 per 1,000, 50% complete, stored
- [IsItDisposable, $149 monthly, Pro, POST /v1/check](https://datacircle.dev/validate-email-apis/isitdisposable/149-monthly-pro-post-v1-check/llms.txt): $0.596 per 1,000, 50% complete, stored
- [IsItDisposable, $182 yearly, Starter, POST /v1/check](https://datacircle.dev/validate-email-apis/isitdisposable/182-yearly-starter-post-v1-check/llms.txt): $1.517 per 1,000, 50% complete, stored
- [IsItDisposable, $470 yearly, Growth, POST /v1/check](https://datacircle.dev/validate-email-apis/isitdisposable/470-yearly-growth-post-v1-check/llms.txt): $0.783 per 1,000, 50% complete, stored
- [IsItDisposable, $1,430 yearly, Pro, POST /v1/check](https://datacircle.dev/validate-email-apis/isitdisposable/1430-yearly-pro-post-v1-check/llms.txt): $0.477 per 1,000, 50% complete, stored
- [IsItDisposable, contact us, Enterprise, POST /v1/check](https://datacircle.dev/validate-email-apis/isitdisposable/contact-us-enterprise-post-v1-check/llms.txt): 50% complete, stored

## IsItDisposable's calls (2)

- `POST /v1/check`: [IsItDisposable, free, POST /v1/check](https://datacircle.dev/validate-email-apis/isitdisposable/free-post-v1-check/llms.txt)
- `POST /v1/check/batch`: [IsItDisposable, free, POST /v1/check/batch](https://datacircle.dev/validate-email-apis/isitdisposable/free-post-v1-check-batch/llms.txt)

## IsItDisposable's APIs (1)

- [IsItDisposable: email verification API pricing, 8 plans, POST /v1/check](https://datacircle.dev/validate-email-apis/isitdisposable/free-post-v1-check/llms.txt)

## IsItDisposable: email verification API alternatives

- [Elastic Email, $189 monthly, Email API Pro (400,000 emails/month), POST /verifications/{email}](https://datacircle.dev/validate-email-apis/elastic-email/189-monthly-email-api-pro-400000-emails-month-post-verifications-email/llms.txt): $0.472 per 1,000, 50% complete, stored
- [KaijuVerifier, $1,430.04 yearly, Scale, POST /api/v1/jobs, Submit an async bulk job](https://datacircle.dev/validate-email-apis/kaijuverifier/1430-04-yearly-scale-post-api-v1-jobs-submit-an-async-bulk-job/llms.txt): $0.477 per 1,000, 50% complete, stored
- [NexMailPro, $290 yearly, Pro, POST /verify/email](https://datacircle.dev/validate-email-apis/nexmailpro/290-yearly-pro-post-verify-email/llms.txt): $0.483 per 1,000, 50% complete, stored
- [ReefAPI, $450 quarterly](https://datacircle.dev/validate-email-apis/reefapi/450-quarterly/llms.txt): $0.50 per 1,000, 67% complete, stored

## Sources

From each provider's own pricing page and docs, and from what providers tell us. We read this row from these pages on 2026-10-28.

- https://api.isitdisposable.com/v1/openapi.json
- https://isitdisposable.com
- https://isitdisposable.com/docs
- https://isitdisposable.com/pricing
- https://isitdisposable.com/terms