# EmailMarker, free, Free, POST /api/upload: Email verification API

> Upload files with up to 1 million emails at once. Get your results via our API or download them directly as a CSV file.

EmailMarker's email verification API on its Free plan. It costs $0.00 per 1,000 emails. It returns 1 of the 6 key fields we check: Deliverability.
The cheapest of the 1,671 priced plans is [treg, top-up from $10](https://datacircle.dev/validate-email-apis/treg/top-up-from-10/llms.txt), at $0.00 per 1,000.

- This page: https://datacircle.dev/validate-email-apis/emailmarker/free-free-post-api-upload
- Get it: https://emailmarker.com/pricing
- Its API docs: https://docs.emailmarker.com
- Sold by: EmailMarker (https://emailmarker.com)
- Checked: 2026-10-23

## In the answer

- Completeness: 17%
- Deliverability: ✓

## Price

- $ per 1,000: $0.00
- Billing: free

## Aggregators

- Aggregators: none

## Charges

- Per: result
- Also pays for: from the same budget: Single Api Verification

## Not found

- $ per 1,000: $0.00

## In their words

- Their pitch: Upload files with up to 1 million emails at once. Get your results via our API or download them directly as a CSV file.

## Data

- Freshness: live
- Keep data: no limit
- Use data: a limited, non-exclusive, non-transferable, revocable license to access and use the Services for your own lawful business purposes [...] You agree not to use the Website or the Services for any of the following purposes: Uploading or processing email lists obtained through unlawful means, including lists acquired without the consent of the individuals concerned, Using the Services in connection with unsolicited commercial communications (spam) or any activity that violates applicable anti-spam legislation, Uploading Uploaded Data that contains special categories of personal data as defined under Article 9 of the GDPR [...], Attempting to gain unauthorized access to any part of the Website, the Services, or any systems or networks connected thereto, Using automated tools, bots, or scripts to access or interact with the Services in a manner that places an unreasonable burden on EmailMarker's infrastructure, Reselling, redistributing, or sublicensing the Services or verification results to third parties without the prior written consent of EmailMarker, Using the Services in any manner that could damage, disable, or impair the Website or interfere with any other party's use of the Services, Engaging in any fraudulent activity in connection with the use of the Services, including providing false registration information or using stolen payment credentials

## Plan

- Pay: $0
- You get: 150 credits
- Enough for: 150 results, once

## Speed

- Answer: by polling

## The call

- You send: filename, file_contents
- Method: POST
- Path: /api/upload

## About the plan

- Plan: Free
- Who can get it: individuals and entities at least 16 years old with the legal capacity to enter into binding agreements

## The 12 fields the plan's answer can hold

success, file ID, file name, lines, lines processed, valid emails, invalid emails, unknown emails, file status, timestamp, valid file, full report file

## EmailMarker's plans (10)

- [EmailMarker, free, Free, POST /api/upload](https://datacircle.dev/validate-email-apis/emailmarker/free-free-post-api-upload/llms.txt): $0.00 per 1,000, 17% complete, live
- [EmailMarker, $3 pack, 1,000 credits, POST /api/upload](https://datacircle.dev/validate-email-apis/emailmarker/3-pack-1000-credits-post-api-upload/llms.txt): $3.00 per 1,000, 17% complete, live
- [EmailMarker, $13 pack, 5,000 credits, POST /api/upload](https://datacircle.dev/validate-email-apis/emailmarker/13-pack-5000-credits-post-api-upload/llms.txt): $2.60 per 1,000, 17% complete, live
- [EmailMarker, $21 pack, 10,000 credits, POST /api/upload](https://datacircle.dev/validate-email-apis/emailmarker/21-pack-10000-credits-post-api-upload/llms.txt): $2.10 per 1,000, 17% complete, live
- [EmailMarker, $84 pack, 50,000 credits, POST /api/upload](https://datacircle.dev/validate-email-apis/emailmarker/84-pack-50000-credits-post-api-upload/llms.txt): $1.68 per 1,000, 17% complete, live
- [EmailMarker, $161 pack, 100,000 credits, POST /api/upload](https://datacircle.dev/validate-email-apis/emailmarker/161-pack-100000-credits-post-api-upload/llms.txt): $1.61 per 1,000, 17% complete, live
- [EmailMarker, $441 pack, 500,000 credits, POST /api/upload](https://datacircle.dev/validate-email-apis/emailmarker/441-pack-500000-credits-post-api-upload/llms.txt): $0.882 per 1,000, 17% complete, live
- [EmailMarker, $589 pack, 1,000,000 credits, POST /api/upload](https://datacircle.dev/validate-email-apis/emailmarker/589-pack-1000000-credits-post-api-upload/llms.txt): $0.589 per 1,000, 17% complete, live
- [EmailMarker, $999 pack, 2,000,000 credits, POST /api/upload](https://datacircle.dev/validate-email-apis/emailmarker/999-pack-2000000-credits-post-api-upload/llms.txt): $0.50 per 1,000, 17% complete, live
- [EmailMarker, contact us, Enterprise, POST /api/upload](https://datacircle.dev/validate-email-apis/emailmarker/contact-us-enterprise-post-api-upload/llms.txt): 17% complete, live

## EmailMarker's calls (2)

- `POST /api/upload`: [EmailMarker, free, Free, POST /api/upload](https://datacircle.dev/validate-email-apis/emailmarker/free-free-post-api-upload/llms.txt)
- `GET /api/verify`: [EmailMarker, free, Free, GET /api/verify](https://datacircle.dev/validate-email-apis/emailmarker/free-free-get-api-verify/llms.txt)

## EmailMarker's APIs (1)

- [EmailMarker: email verification API pricing, 10 plans, POST /api/upload](https://datacircle.dev/validate-email-apis/emailmarker/free-free-post-api-upload/llms.txt)

## EmailMarker: email verification API alternatives

- [Enrich.so, free, Free, POST /email-validation](https://datacircle.dev/validate-email-apis/enrich-so/free/llms.txt): $0.00 per 1,000, 50% complete, live
- [GetProspect, free, Free, POST /v2/email-verifications](https://datacircle.dev/validate-email-apis/getprospect/free-free-post-v2-email-verifications/llms.txt): $0.00 per 1,000, 50% complete, live
- [KaijuVerifier, free, Free, POST /api/v1/jobs](https://datacircle.dev/validate-email-apis/kaijuverifier/free-free-post-api-v1-jobs/llms.txt): $0.00 per 1,000, 50% complete, live
- [Neutrino API, free, Free, GET /email-verify](https://datacircle.dev/validate-email-apis/neutrino-api/free-free-get-email-verify/llms.txt): $0.00 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 2026-10-23.

- https://docs.emailmarker.com
- https://emailmarker.com
- https://emailmarker.com/api
- https://emailmarker.com/pricing
- https://emailmarker.com/terms
- https://help.emailmarker.com/en-us/article/list-verification-1djwrqd