# CampaignKit, free, POST /email/validate/job: Email verification API

> Validation jobs allow you to validate large batches of email addresses asynchronously.

CampaignKit's Free plan for the email verification API costs $0.00 per 1,000 emails. CampaignKit's docs list 3 of the 6 fields on our checklist: Address, Deliverability, Confidence.
We haven't run CampaignKit through [our email verification API benchmark](https://datacircle.dev/best-email-verification-api.txt) yet.
This plan is free. We rank 4,098 plans for email verification APIs by price. Half the plans cost $1.995 or less per 1,000 emails. [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. [StableEnrich's pay-as-you-go plan](https://datacircle.dev/validate-email-apis/stableenrich/pay-as-you-go-pay-per-request-with-x402-or-mpp-post-api-minerva-validate-emails/llms.txt) costs the least for 10,000 emails a month: $0.05.
[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), [looot](https://datacircle.dev/validate-email-apis/looot/top-up/llms.txt) and [MailTester Ninja](https://datacircle.dev/validate-email-apis/mailtester-ninja/23-99-monthly/llms.txt) are the best email verification API providers in the Datacircle benchmark.

- This page: https://datacircle.dev/validate-email-apis/campaignkit/free-post-email-validate-job
- [Email validation API: best verification providers compared](https://datacircle.dev/best-email-verification-api.txt)
- Get it: https://campaignkit.cc/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- Request: `POST https://api.campaignkit.cc/v1/email/validate/job`
- API key: with the plan, on https://campaignkit.cc/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- Its API docs: https://campaignkit.cc/docs/api/validation-jobs?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing#create-validation-job
- Sold by: CampaignKit (https://campaignkit.cc?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing)
- Checked: 2026-11-08

## In the answer

- Completeness: 50%
- Address: ✓
- Deliverability: ✓
- Confidence: ✓

## Price

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

## Aggregators

- Aggregators: none

## Charges

- Also pays for: from the same budget: Email Validation · Email Finder

## Overage

- Units cap: hard

## Not found

- $ per 1,000: $0.00

## Catch-all

- $ per 1,000: $0.00

## In their words

- Their pitch: Validation jobs allow you to validate large batches of email addresses asynchronously.

## Data

- Freshness: live
- What it checks: format, mail servers, disposable domains, role addresses, mailbox
- Keep data: no limit
- Use data: You may use the Services only for lawful purposes and in accordance with these Terms. You agree to use the Services for legitimate email verification purposes, such as: Validating opt-in email addresses for marketing campaigns, Cleaning your own email lists, Verifying business contact information, Improving email deliverability for your organization [...] You agree NOT to use the Services for any of the following prohibited activities: Spam: Sending unsolicited bulk emails or facilitating spam operations, Reselling Email Lists: Creating, maintaining, or selling email lists without proper consent, Scraping: Using the Services to scrape, harvest, or collect email addresses from websites without authorization, Malicious Activities: Using the Services for phishing, fraud, identity theft, or other criminal activities, Harassment: Using verified email addresses to harass, abuse, or harm individuals, Violation of Laws: Using the Services in any manner that violates applicable laws, including CAN-SPAM Act, GDPR, or other anti-spam regulations, System Abuse: Attempting to bypass rate limits, access restrictions, or security measures, Reverse Engineering: Attempting to reverse engineer, decompile, or extract the underlying algorithms of the Services, Automated Access: Using bots, scrapers, or automated tools to access the Services outside of our official API [...] We grant you a limited, non-exclusive, non-transferable, non-sublicensable license to access and use the Services for your internal business purposes in accordance with these Terms. You may not: Copy, modify, or create derivative works of the Services, Reverse engineer, decompile, or disassemble the Services, Remove or alter any proprietary notices from the Services, Use the Services to build a competing service

## Plan

- Pay: $0
- You get: 200 credits
- Enough for: 200 results, once

## Rate limit

- Per second: 0.17

## Speed

- Answer: by polling or webhook

## The call

- You send: source, one of file or input. Optional: label, integration
- Method: POST
- Path: /email/validate/job

## About the plan

- Plan: Free
- Who can get it: every new account

## The 11 fields the plan's answer can hold

job ID, email, syntax, MX, mailbox, score, classifier, description, SMTP response, did you mean, did you mean domain

## CampaignKit's plans (11)

- [CampaignKit, free, POST /email/validate/job](https://datacircle.dev/validate-email-apis/campaignkit/free-post-email-validate-job/llms.txt): $0.00 per 1,000, 50% complete, live
- [CampaignKit, $6 pack, OneTime Pass 2,500, POST /email/validate/job](https://datacircle.dev/validate-email-apis/campaignkit/6-pack-onetime-pass-2500-post-email-validate-job/llms.txt): $2.40 per 1,000, 50% complete, live
- [CampaignKit, $12 pack, OneTime Pass 5,000, POST /email/validate/job](https://datacircle.dev/validate-email-apis/campaignkit/12-pack-onetime-pass-5000-post-email-validate-job/llms.txt): $2.40 per 1,000, 50% complete, live
- [CampaignKit, $15 pack, OneTime Pass 10,000, POST /email/validate/job](https://datacircle.dev/validate-email-apis/campaignkit/15-pack-onetime-pass-10000-post-email-validate-job/llms.txt): $1.50 per 1,000, 50% complete, live
- [CampaignKit, $38 pack, OneTime Pass 25,000, POST /email/validate/job](https://datacircle.dev/validate-email-apis/campaignkit/38-pack-onetime-pass-25000-post-email-validate-job/llms.txt): $1.52 per 1,000, 50% complete, live
- [CampaignKit, $75 pack, OneTime Pass 50,000, POST /email/validate/job](https://datacircle.dev/validate-email-apis/campaignkit/75-pack-onetime-pass-50000-post-email-validate-job/llms.txt): $1.50 per 1,000, 50% complete, live
- [CampaignKit, $120 pack, OneTime Pass 100,000, POST /email/validate/job](https://datacircle.dev/validate-email-apis/campaignkit/120-pack-onetime-pass-100000-post-email-validate-job/llms.txt): $1.20 per 1,000, 50% complete, live
- [CampaignKit, $199 pack, OneTime Pass 250,000, POST /email/validate/job](https://datacircle.dev/validate-email-apis/campaignkit/199-pack-onetime-pass-250000-post-email-validate-job/llms.txt): $0.796 per 1,000, 50% complete, live
- [CampaignKit, $279 pack, OneTime Pass 500,000, POST /email/validate/job](https://datacircle.dev/validate-email-apis/campaignkit/279-pack-onetime-pass-500000-post-email-validate-job/llms.txt): $0.558 per 1,000, 50% complete, live
- [CampaignKit, $429 pack, OneTime Pass 1,000,000, POST /email/validate/job](https://datacircle.dev/validate-email-apis/campaignkit/429-pack-onetime-pass-1000000-post-email-validate-job/llms.txt): $0.429 per 1,000, 50% complete, live
- [CampaignKit, contact us, Enterprise, POST /email/validate/job](https://datacircle.dev/validate-email-apis/campaignkit/contact-us-enterprise-post-email-validate-job/llms.txt): 50% complete, live

## CampaignKit's calls for this API (2)

- `POST /email/validate/job`: [CampaignKit, free, POST /email/validate/job](https://datacircle.dev/validate-email-apis/campaignkit/free-post-email-validate-job/llms.txt)
- `POST /email/validate`: [CampaignKit, free, POST /email/validate](https://datacircle.dev/validate-email-apis/campaignkit/free-post-email-validate/llms.txt)

## CampaignKit's APIs (2)

- [CampaignKit: email finder API pricing, 11 plans](https://datacircle.dev/find-email-apis/campaignkit/free/llms.txt)
- [CampaignKit: email verification API pricing, 11 plans, POST /email/validate/job](https://datacircle.dev/validate-email-apis/campaignkit/free-post-email-validate-job/llms.txt)

## CampaignKit: email verification API alternatives

- [MyEmailVerifier, $549 monthly, Monthly Subscription, 2,000,000 emails + 100,000 bonus, GET /verifier/validate_single/{email}/{API_KEY}](https://datacircle.dev/validate-email-apis/myemailverifier/549-monthly-monthly-subscription-2000000-emails-100000-bonus-get-verifier-validate-single-email-api-key/llms.txt): $0.424 per 1,000, 33% complete, live
- [EndBounce, $5,124 yearly](https://datacircle.dev/validate-email-apis/endbounce/5124-yearly/llms.txt): $0.427 per 1,000, 50% complete, live
- [Proofy, $429 pack, Pay-As-You-Go, 1,000,000 credits, GET /verify/single](https://datacircle.dev/validate-email-apis/proofy/429-pack-pay-as-you-go-1000000-credits-get-verify-single/llms.txt): $0.429 per 1,000, 33% complete, live
- [ReachStream, $429 pack](https://datacircle.dev/validate-email-apis/reachstream/429-pack/llms.txt): $0.43 per 1,000, 33% 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 2026-11-08.

- https://campaignkit.cc/developers?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://campaignkit.cc/docs/api?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://campaignkit.cc/docs/api/email-validation?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://campaignkit.cc/docs/api/validation-jobs?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://campaignkit.cc/docs/api/webhooks?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://campaignkit.cc/docs/getting-started?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://campaignkit.cc/docs/mcp-server?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://campaignkit.cc/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://campaignkit.cc/terms?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing