# OneSimpleAPI, free: Email verification API

> With OneSimpleApi.com you can verify and validate emails before they start moving through your workflow, ensuring that you have only real high-value users.

OneSimpleAPI's email verification API on its Trial plan. It costs $0.00 per 1,000 emails. It returns 1 of the 6 key fields we check: Deliverability.
We haven't run OneSimpleAPI through [our email verification API benchmark](https://datacircle.dev/best-email-verification-api.txt) yet.
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/onesimpleapi/free
- [Email validation API: 180+ verification providers compared](https://datacircle.dev/best-email-verification-api.txt)
- Get it: https://onesimpleapi.com/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- Request: `GET https://onesimpleapi.com/api/email`
- API key: with the plan, on https://onesimpleapi.com/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- Its API docs: https://onesimpleapi.com/docs/email-validation?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- Sold by: OneSimpleAPI (https://onesimpleapi.com?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing)
- Checked: 2026-11-05

## In the answer

- Completeness: 17%
- Deliverability: ✓

## Price

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

## Aggregators

- Aggregators: none

## Charges

- Also pays for: from the same budget: Cache for APIs · Color and color palette generator · Exchange Rate · Expand Shortened URL · Image Information · Image manager · PDF · PDF Signing · Purchase Power Parity Discount Calculator · QR Codes · Readability, Reading Time and Sentiment for Texts · Screenshot · Spotify Profiles · URL Shortener · Web Page Information · Web Page Status

## Overage

- Units cap: hard

## Not found

- $ per 1,000: $0.00

## In their words

- Their pitch: With OneSimpleApi.com you can verify and validate emails before they start moving through your workflow, ensuring that you have only real high-value users.

## Data

- What it checks: format, mail servers, disposable domains, role addresses
- Keep data: no limit
- Use data: Content found on or through this Service are the property of OneSimpleApi or used with permission. You may not distribute, modify, transmit, reuse, download, repost, copy, or use said Content, whether in whole or in part, for commercial purposes or for personal gain, without express advance written permission from us.

## Plan

- Pay: $0
- You get: 100 requests
- Enough for: 100 calls, once
- Expires: never

## Rate limit

- Per second: 0.0056
- Batch: 1

## Speed

- Answer: in the call

## The call

- You send: email. Optional: output
- Method: GET
- Path: /api/email

## About the plan

- Plan: Trial
- Who can get it: anyone above the age of 18

## The 10 fields the plan's answer can hold

valid format, valid domain, valid MX records, free, disposable, role, canonical, deliverability, safe to register as user, time taken

## OneSimpleAPI's plans (4)

- [OneSimpleAPI, free](https://datacircle.dev/validate-email-apis/onesimpleapi/free/llms.txt): $0.00 per 1,000, 17% complete
- [OneSimpleAPI, $35 monthly](https://datacircle.dev/validate-email-apis/onesimpleapi/35-monthly/llms.txt): $1.75 per 1,000, 17% complete
- [OneSimpleAPI, $99 monthly](https://datacircle.dev/validate-email-apis/onesimpleapi/99-monthly/llms.txt): $0.66 per 1,000, 17% complete
- [OneSimpleAPI, $499 monthly](https://datacircle.dev/validate-email-apis/onesimpleapi/499-monthly/llms.txt): $0.499 per 1,000, 17% complete

## OneSimpleAPI's calls (1)

- `GET /api/email`: [OneSimpleAPI, free](https://datacircle.dev/validate-email-apis/onesimpleapi/free/llms.txt)

## OneSimpleAPI's APIs (1)

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

## OneSimpleAPI: email verification API alternatives

- [Bounceless, $499 monthly, Scale: 1,000,000 credits per month, POST /v1/requests, Create a batch (emails)](https://datacircle.dev/validate-email-apis/bounceless/499-monthly-scale-1000000-credits-per-month-post-v1-requests-1000000-credits-a-month/llms.txt): $0.499 per 1,000, 50% complete, live
- [MailTester, $499 pack](https://datacircle.dev/validate-email-apis/mailtester/499-pack/llms.txt): $0.499 per 1,000, 50% complete, live
- [Icypeas, $499 monthly, Hypergrowth, 100,000 credits a month, POST /bulk-search](https://datacircle.dev/validate-email-apis/icypeas/499-monthly-hypergrowth-100000-credits-a-month-post-bulk-search/llms.txt): $0.499 per 1,000, 33% complete
- [VeriMails, $499 pack, 1,000,000 credits, POST /api/verify/single](https://datacircle.dev/validate-email-apis/verimails/499-pack-1000000-credits-post-api-verify-single/llms.txt): $0.499 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://onesimpleapi.com/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://onesimpleapi.com/docs?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://onesimpleapi.com/docs/email-validation?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://onesimpleapi.com/terms-of-service?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing