# Watch-IP, free, POST /v1/email/batch: Email verification API

> Checks 1–100 addresses in one request with the same checks and result shape as POST /v1/email/validate, one result per address in input order.

Watch-IP's Free plan for the email verification API costs $0.00 per 1,000 emails. We check each provider's docs for 6 fields. Watch-IP's docs list 3: Address, Deliverability, Company.
We haven't run Watch-IP through [our email verification API benchmark](https://datacircle.dev/best-email-verification-api.txt) yet.
This plan is free. We rank 4,767 plans for email verification APIs by price. Half the plans cost $2.00 or less per 1,000 emails. [728 email verification API plans on our price sheet are free.](https://datacircle.dev/best-email-verification-api.txt) [pingutil's free plan](https://datacircle.dev/validate-email-apis/pingutil/free-api-key-post-v1-verify/llms.txt) scores highest of the free plans in our benchmark, at 82.3 out of 100.
[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, and costs less up front than treg's top-up from $10.
[Validemail.co](https://datacircle.dev/validate-email-apis/validemail-co/9-90-monthly-9-90-month-get-api-v1-validate/llms.txt), [pingutil](https://datacircle.dev/validate-email-apis/pingutil/free-api-key-post-v1-verify/llms.txt) and [looot](https://datacircle.dev/validate-email-apis/looot/top-up/llms.txt) are the best email verification API providers in the Datacircle benchmark.

- This page: https://datacircle.dev/validate-email-apis/watch-ip/free-post-v1-email-batch
- [Email validation API: best verification providers compared](https://datacircle.dev/best-email-verification-api.txt)
- Get it: https://watch-ip.com/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- Request: `POST https://api.watch-ip.com/v1/email/batch`
- API key: with the plan, on https://watch-ip.com/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- Its API docs: https://watch-ip.com/docs/reference/email?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- Sold by: Watch-IP (https://watch-ip.com?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing)
- Checked: 2026-11-11

## In the answer

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

## Price

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

## Aggregators

- Aggregators: none

## Charges

- Also pays for: from the same budget: Check an email address · Submit an email list for asynchronous checking · Look up the requesting visitor's geolocation · Look up geolocation for an arbitrary IP address · Look up geolocation for a batch of IP addresses · Score a signup from its email address and IP · Check an IP against a user's last-known location for impossible travel

## Overage

- Units cap: hard

## Not found

- $ per 1,000 calls that find nothing: $0.00

## In their words

- Their pitch: Checks 1–100 addresses in one request with the same checks and result shape as POST /v1/email/validate, one result per address in input order.

## Data

- What it checks: format, mail servers, disposable domains, role addresses
- Keep data: no limit
- Use data: You may use the Service only for lawful purposes and in compliance with these Terms, our Privacy Policy, and (where applicable) our Data Processing Addendum. Without limiting the foregoing, you agree not to: [...] use the Service to build or contribute to a competing IP geolocation, threat-intelligence, or lookup product, or to systematically reconstruct our underlying threat lists or GeoIP data through repeated queries, use geolocation, VPN/Tor/datacenter, or risk-scoring output as the sole automated basis for a decision that produces legal or similarly significant effects for an individual [...] without a meaningful human review step, use the Service to discriminate against, single out, or take adverse action against individuals on the basis of a protected characteristic that can be inferred or approximated from location data, [...] We grant you a non-exclusive, non-transferable license to call the API and use the dashboard for your own internal business purposes and to serve your own end users. You may not resell, sublicense, or provide standalone access to the Service's underlying data (as opposed to a product or feature you've built using it) without our prior written consent.

## Plan

- Pay: $0
- You get: 10,000 requests a month
- Enough for: 10,000 results a month

## Rate limit

- Per second: 0.5 (30 a minute)
- Batch: 100

## Speed

- Answer: in the call

## The call

- You send: emails
- Method: POST
- Path: /v1/email/batch

## About the plan

- Plan: Free
- Who can get it: anyone with an account

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

email address, domain, syntax valid, disposable, normalized email, canonical email, disposable source, free provider, role address, did you mean, MX status, MX host, verdict, reasons

## Watch-IP's plans (8)

- [Watch-IP, free, POST /v1/email/batch](https://datacircle.dev/validate-email-apis/watch-ip/free-post-v1-email-batch/llms.txt): $0.00 per 1,000, 50% complete
- [Watch-IP, $9 monthly, Starter, POST /v1/email/batch](https://datacircle.dev/validate-email-apis/watch-ip/9-monthly-starter-post-v1-email-batch/llms.txt): $0.036 per 1,000, 50% complete
- [Watch-IP, $29 monthly, Growth, POST /v1/email/batch](https://datacircle.dev/validate-email-apis/watch-ip/29-monthly-growth-post-v1-email-batch/llms.txt): $0.019 per 1,000, 50% complete
- [Watch-IP, $79 monthly, Scale, POST /v1/email/batch](https://datacircle.dev/validate-email-apis/watch-ip/79-monthly-scale-post-v1-email-batch/llms.txt): $0.016 per 1,000, 50% complete
- [Watch-IP, $97.20 yearly, Starter, POST /v1/email/batch](https://datacircle.dev/validate-email-apis/watch-ip/97-20-yearly-starter-post-v1-email-batch/llms.txt): $0.032 per 1,000, 50% complete
- [Watch-IP, $313.20 yearly, Growth, POST /v1/email/batch](https://datacircle.dev/validate-email-apis/watch-ip/313-20-yearly-growth-post-v1-email-batch/llms.txt): $0.017 per 1,000, 50% complete
- [Watch-IP, $853.20 yearly, Scale, POST /v1/email/batch](https://datacircle.dev/validate-email-apis/watch-ip/853-20-yearly-scale-post-v1-email-batch/llms.txt): $0.014 per 1,000, 50% complete
- [Watch-IP, contact us, Enterprise, POST /v1/email/batch](https://datacircle.dev/validate-email-apis/watch-ip/contact-us-enterprise-post-v1-email-batch/llms.txt): 50% complete

## Watch-IP's calls for this API (3)

- `POST /v1/email/batch`: [Watch-IP, free, POST /v1/email/batch](https://datacircle.dev/validate-email-apis/watch-ip/free-post-v1-email-batch/llms.txt)
- `POST /v1/email/validate`: [Watch-IP, free, POST /v1/email/validate](https://datacircle.dev/validate-email-apis/watch-ip/free-post-v1-email-validate/llms.txt)
- `POST /v1/email/jobs`: [Watch-IP, free, POST /v1/email/jobs](https://datacircle.dev/validate-email-apis/watch-ip/free-post-v1-email-jobs/llms.txt)

## Watch-IP's APIs (2)

- [Watch-IP Email verification API pricing, 8 plans, POST /v1/email/batch](https://datacircle.dev/validate-email-apis/watch-ip/free-post-v1-email-batch/llms.txt)
- [Watch-IP IP company lookup API pricing, 8 plans, POST /v1/lookup](https://datacircle.dev/ip-company-lookup-apis/watch-ip/free-post-v1-lookup/llms.txt)
- [Watch-IP IP company lookup API pricing, 8 plans, GET /v1/lookup/{ip}](https://datacircle.dev/ip-company-lookup-apis/watch-ip/free-get-v1-lookup-ip/llms.txt)

## Watch-IP: email verification API alternatives

[Watch-IP alternatives: other email verification API providers by price](https://datacircle.dev/watch-ip-alternatives.txt)

We list Watch-IP's cheapest paid plan first. Next we list other providers' plans closest to Watch-IP in price per 1,000 emails. We also show the SignupVet plan. Its price is farther from the price of Watch-IP's cheapest paid plan.

- [Watch-IP, $853.20 yearly, Scale, POST /v1/email/batch](https://datacircle.dev/validate-email-apis/watch-ip/853-20-yearly-scale-post-v1-email-batch/llms.txt): $0.014 per 1,000, 50% complete
- [SignupVet, free](https://datacircle.dev/validate-email-apis/signupvet/free/llms.txt): $0.00 per 1,000, 67% complete
- [EmailValidationTool, $40 pack, Agency LTD, POST /v1/verify/single](https://datacircle.dev/validate-email-apis/emailvalidationtool/40-pack-agency-ltd-post-v1-verify-single/llms.txt): $0.014 per 1,000, 67% complete
- [proxycheck.io, $54.89 yearly](https://datacircle.dev/validate-email-apis/proxycheck-io/54-89-yearly/llms.txt): $0.015 per 1,000, 33% complete, stored
- [Botoi, $49 monthly, Pro, POST /v1/disposable-email/check](https://datacircle.dev/validate-email-apis/botoi/49-monthly-pro-post-v1-disposable-email-check/llms.txt): $0.016 per 1,000, 50% complete, stored
- [ApiZero, CNY 3,999 yearly](https://datacircle.dev/validate-email-apis/apizero/cny-3999-yearly/llms.txt): $0.016 per 1,000, 50% complete

## Sources

From each provider's own pricing page and docs, and from what providers tell us. We read this row from these pages on 2026-11-11.

- https://api.watch-ip.com/openapi.json?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://watch-ip.com?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://watch-ip.com/docs/errors?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://watch-ip.com/docs/reference/email?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://watch-ip.com/legal/terms?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://watch-ip.com/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://watch-ip.com/products/disposable-email-detection?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing