# ApiOne, free: Email verification API

> Check an email address before you send: syntax, domain mail servers, mailbox reachability, catch-all, disposable and role addresses, with a recommended action.

ApiOne's email verification API on its Free plan. It costs $0.00 per 1,000 emails. ApiOne's docs list 2 of the 6 fields on our checklist: Deliverability, Confidence.
We haven't run ApiOne through [our email verification API benchmark](https://datacircle.dev/best-email-verification-api.txt) yet.
This plan is free. We rank 3,960 plans for email verification APIs by price. Half the plans cost $1.998 per 1,000 emails or less. [See the best free email verification API plan.](https://datacircle.dev/best-email-verification-api.txt)
[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.
[pingutil](https://datacircle.dev/validate-email-apis/pingutil/free-api-key-post-v1-verify/llms.txt), [MailTester Ninja](https://datacircle.dev/validate-email-apis/mailtester-ninja/23-99-monthly/llms.txt) and [Giggal](https://datacircle.dev/validate-email-apis/giggal/39-pack-50000-credits-post-v1-verify/llms.txt) are the best email verification API providers in the Datacircle benchmark.

- This page: https://datacircle.dev/validate-email-apis/apione/free
- [Email validation API: 200+ verification providers compared](https://datacircle.dev/best-email-verification-api.txt)
- Get it: https://apione.store/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing#pricing
- Request: `POST https://api.apione.store/api/v1/emails/verify`
- API key: with the plan, on https://apione.store/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing#pricing
- Its API docs: https://apione.store/endpoints/email-verification?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- Sold by: ApiOne (https://apione.store?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing)
- Checked: 2026-11-07

## In the answer

- Completeness: 33%
- Deliverability: ✓
- Confidence: ✓

## Price

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

## Aggregators

- Aggregators: none

## Charges

- Also pays for: from the same budget: Company enrichment · Company search · People enrichment · People search · Email finder · Tech stack detection · Business signals · Hiring signals · Arabic/English name matching · Company name normalization · Signal Watch

## Overage

- Units cap: hard

## Not found

- $ per 1,000: $0.00

## In their words

- Their pitch: Check an email address before you send: syntax, domain mail servers, mailbox reachability, catch-all, disposable and role addresses, with a recommended action.

## Data

- Freshness: live
- What it checks: format, mail servers, disposable domains, role addresses, mailbox
- Keep data: no limit
- Use data: Permitted use: Enriching company records in your CRM, sales tools, or internal databases. Finding and verifying professional email addresses for legitimate business outreach. Detecting the technology stack of companies you are targeting for sales or partnership. Identifying hiring and growth signals to prioritise outreach. Building internal sales, recruiting, or GTM tools for your organisation. Integrating ApiOne data into your own SaaS product to enrich your customers' records. Academic or market research using aggregated, anonymised outputs. Prohibited use: Reselling raw data: You may not resell, license, or distribute raw API responses as a standalone data product or data feed to third parties. Competitive use: You may not use ApiOne to build a competing B2B data enrichment API or data provider service. Reverse engineering: You may not attempt to extract, reverse-engineer, or reconstruct our underlying data sources or AI models. Spam: You may not use email addresses returned by ApiOne for bulk unsolicited spam campaigns. All outreach must comply with CAN-SPAM, GDPR, and applicable local law. Illegal targeting: You may not use ApiOne to identify, profile, or contact individuals for discriminatory, harassing, or unlawful purposes. Key sharing: You may not share your API key with users or organisations outside your company. Automation abuse: You may not use automated scripts to deliberately exceed your plan's rate limits or probe system limits. Account circumvention: You may not register multiple free accounts to bypass credit limits.

## Plan

- Pay: $0
- You get: 100 credits a month
- Enough for: 100 calls a month
- Expires: reset monthly, credits cannot be accumulated

## Rate limit

- Per second: 0.5
- Concurrent: 1
- Batch: 1

## Speed

- Answer: in the call

## The call

- You send: email
- Method: POST
- Path: /emails/verify

## About the plan

- Plan: Free
- Who can get it: anyone

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

syntax valid, deliverable, reachability, catch-all, mailbox exists, role address, disposable, free provider, confidence score, recommended action

## ApiOne's plans (4)

- [ApiOne, free](https://datacircle.dev/validate-email-apis/apione/free/llms.txt): $0.00 per 1,000, 33% complete, live
- [ApiOne, $49 monthly](https://datacircle.dev/validate-email-apis/apione/49-monthly/llms.txt): $9.80 per 1,000, 33% complete, live
- [ApiOne, $149 monthly](https://datacircle.dev/validate-email-apis/apione/149-monthly/llms.txt): $5.96 per 1,000, 33% complete, live
- [ApiOne, $499 monthly](https://datacircle.dev/validate-email-apis/apione/499-monthly/llms.txt): $4.99 per 1,000, 33% complete, live

## ApiOne's calls for this API (1)

- `POST /emails/verify`: [ApiOne, free](https://datacircle.dev/validate-email-apis/apione/free/llms.txt)

## ApiOne's APIs (8)

- [ApiOne: company discovery API pricing, 4 plans](https://datacircle.dev/company-discovery-apis/apione/free/llms.txt)
- [ApiOne: company enrichment API pricing, 4 plans](https://datacircle.dev/company-enrichment-apis/apione/free/llms.txt)
- [ApiOne: company open jobs API pricing, 4 plans](https://datacircle.dev/company-open-job-apis/apione/free/llms.txt)
- [ApiOne: tech stack API pricing, 4 plans](https://datacircle.dev/company-technology-apis/apione/free/llms.txt)
- [ApiOne: email verification API pricing, 4 plans](https://datacircle.dev/validate-email-apis/apione/free/llms.txt)
- [ApiOne: email finder API pricing, 4 plans](https://datacircle.dev/find-email-apis/apione/free/llms.txt)
- [ApiOne: people search API pricing, 4 plans](https://datacircle.dev/people-search-apis/apione/free/llms.txt)
- [ApiOne: people enrichment API pricing, 4 plans](https://datacircle.dev/person-enrichment-apis/apione/free/llms.txt)

## ApiOne: email verification API alternatives

- [Verifalia, $49.90 pack](https://datacircle.dev/validate-email-apis/verifalia/49-90-pack/llms.txt): $4.99 per 1,000, 67% complete, live
- [Scrupp, $499 monthly](https://datacircle.dev/validate-email-apis/scrupp/499-monthly/llms.txt): $4.99 per 1,000, 33% complete, live
- [EnvoAPI, $749 pack, Scale top-up, GET /v1/emails/verify](https://datacircle.dev/validate-email-apis/envoapi/749-pack-scale-top-up-get-v1-emails-verify/llms.txt): $4.993 per 1,000, 50% complete, live
- [Email Verifier API, $49.95 pack](https://datacircle.dev/validate-email-apis/email-verifier-api/49-95-pack/llms.txt): $4.995 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 2026-11-07.

- https://apione.store?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://apione.store/acceptable-use?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://apione.store/docs?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://apione.store/endpoints/email-verification?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://apione.store/llms.txt?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://apione.store/mcp?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://apione.store/refund?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://apione.store/terms?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing