# Kawaa, free, POST /v1/verify/file: Email verification API

> Clean a list from a CSV, check sign-ups through the API, or let an AI agent verify over MCP. Layered syntax, domain, mailbox and risk checks on every result.

Kawaa's email verification API on its Free plan. It costs $0.00 per 1,000 emails. It returns 2 of the 6 key fields we check: Address, Deliverability.
We haven't run Kawaa through [our email verification API benchmark](https://datacircle.dev/best-email-verification-api.txt) yet.
This plan is free. We rank 3,338 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 our benchmark.

- This page: https://datacircle.dev/validate-email-apis/kawaa/free-post-v1-verify-file
- [Email validation API: 160+ providers compared](https://datacircle.dev/best-email-verification-api.txt)
- Get it: https://kawaa.com/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- Request: `POST https://api.kawaa.com/v1/verify/file`
- API key: with the plan, on https://kawaa.com/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- Its API docs: https://kawaa.com/support/api-file/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- Sold by: Kawaa (https://kawaa.com?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing)
- Checked: 2026-11-02

## In the answer

- Completeness: 33%
- Address: ✓
- Deliverability: ✓

## Price

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

## Aggregators

- Aggregators: none

## Charges

- Also pays for: from the same budget: Single email verification · Batch verification · Look at a domain · Engagement history for an address · Engagement history for several addresses · Check a domain's email authentication

## Overage

- Units cap: hard

## Not found

- $ per 1,000: $0.00

## Catch-all

- $ per 1,000: $0.00

## In their words

- Their pitch: Clean a list from a CSV, check sign-ups through the API, or let an AI agent verify over MCP. Layered syntax, domain, mailbox and risk checks on every result.

## Data

- Freshness: 24 hours
- What it checks: format, mail servers, disposable domains, role addresses, mailbox
- Keep data: no limit
- Use data: You agree NOT to use the Service to: Verify email addresses without proper consent or legal basis, Send spam or unsolicited communications, Violate any applicable laws or regulations (including CAN-SPAM, GDPR), Attempt to circumvent rate limits or abuse prevention measures, Reverse engineer or attempt to extract source code, Resell the Service without a white-label agreement, Use the Service for any illegal or harmful purpose

## Plan

- Pay: $0
- You get: 100 credits
- Enough for: 100 results, once
- Expires: never

## Rate limit

- Per second: 0.17
- Batch: 100

## Speed

- Answer: by polling or webhook

## The call

- You send: action "get_upload_url" or "process", filename, file_size, file_key. Optional: webhook_url, webhook_secret, options.deep_verify, options.include_ai, options.enrich, options.skip_cache, include_activity, Idempotency-Key
- Method: POST
- Path: /v1/verify/file

## About the plan

- Plan: Free
- Who can get it: anyone at least 18 years old

## The 20 fields the plan's answer can hold

success, upload URL, file key, upload URL lifetime, next step, job ID, status, total submitted, duplicates removed, invalid emails skipped, unique emails, email column, credits used, credits remaining, credits refunded, credits held, enqueue unknown, dispatch in progress, dispatch settlement pending, message

## Kawaa's plans (11)

- [Kawaa, free, POST /v1/verify/file](https://datacircle.dev/validate-email-apis/kawaa/free-post-v1-verify-file/llms.txt): $0.00 per 1,000, 33% complete, 24 hours
- [Kawaa, $5 pack, 1,000 credits, POST /v1/verify/file](https://datacircle.dev/validate-email-apis/kawaa/5-pack-1000-credits-post-v1-verify-file/llms.txt): $5.00 per 1,000, 33% complete, 24 hours
- [Kawaa, $20 pack, 5,000 credits, POST /v1/verify/file](https://datacircle.dev/validate-email-apis/kawaa/20-pack-5000-credits-post-v1-verify-file/llms.txt): $4.00 per 1,000, 33% complete, 24 hours
- [Kawaa, $35 pack, 10,000 credits, POST /v1/verify/file](https://datacircle.dev/validate-email-apis/kawaa/35-pack-10000-credits-post-v1-verify-file/llms.txt): $3.50 per 1,000, 33% complete, 24 hours
- [Kawaa, $150 pack, 50,000 credits, POST /v1/verify/file](https://datacircle.dev/validate-email-apis/kawaa/150-pack-50000-credits-post-v1-verify-file/llms.txt): $3.00 per 1,000, 33% complete, 24 hours
- [Kawaa, $250 pack, 100,000 credits, POST /v1/verify/file](https://datacircle.dev/validate-email-apis/kawaa/250-pack-100000-credits-post-v1-verify-file/llms.txt): $2.50 per 1,000, 33% complete, 24 hours
- [Kawaa, $19 monthly, Starter, POST /v1/verify/file](https://datacircle.dev/validate-email-apis/kawaa/19-monthly-starter-post-v1-verify-file/llms.txt): $3.80 per 1,000, 33% complete, 24 hours
- [Kawaa, $49 monthly, Professional, POST /v1/verify/file](https://datacircle.dev/validate-email-apis/kawaa/49-monthly-professional-post-v1-verify-file/llms.txt): $1.96 per 1,000, 33% complete, 24 hours
- [Kawaa, $99 monthly, Business, POST /v1/verify/file](https://datacircle.dev/validate-email-apis/kawaa/99-monthly-business-post-v1-verify-file/llms.txt): $0.99 per 1,000, 33% complete, 24 hours
- [Kawaa, $299 monthly, Enterprise, POST /v1/verify/file](https://datacircle.dev/validate-email-apis/kawaa/299-monthly-enterprise-post-v1-verify-file/llms.txt): $0.598 per 1,000, 33% complete, 24 hours
- [Kawaa, contact us, Custom plan, POST /v1/verify/file](https://datacircle.dev/validate-email-apis/kawaa/contact-us-custom-plan-post-v1-verify-file/llms.txt): 33% complete, 24 hours

## Kawaa's calls for this API (3)

- `POST /v1/verify/batch`: [Kawaa, free, POST /v1/verify/batch](https://datacircle.dev/validate-email-apis/kawaa/free-post-v1-verify-batch/llms.txt)
- `POST /v1/verify/file`: [Kawaa, free, POST /v1/verify/file](https://datacircle.dev/validate-email-apis/kawaa/free-post-v1-verify-file/llms.txt)
- `POST /v1/verify`: [Kawaa, free, POST /v1/verify](https://datacircle.dev/validate-email-apis/kawaa/free-post-v1-verify/llms.txt)

## Kawaa's APIs (2)

- [Kawaa: email verification API pricing, 11 plans, POST /v1/verify/file](https://datacircle.dev/validate-email-apis/kawaa/free-post-v1-verify-file/llms.txt)
- [Kawaa: email finder API pricing, 4 plans, POST /v1/find](https://datacircle.dev/find-email-apis/kawaa/19-monthly-starter-post-v1-find/llms.txt)
- [Kawaa: email finder API pricing, 4 plans, POST /v1/find/bulk](https://datacircle.dev/find-email-apis/kawaa/19-monthly-starter-post-v1-find-bulk/llms.txt)

## Kawaa: email verification API alternatives

- [DeBounce, $1,196 monthly, 2M credits, Monthly, GET /v1/, Single email validation](https://datacircle.dev/validate-email-apis/debounce/1196-monthly-2m-credits-monthly-get-v1/llms.txt): $0.598 per 1,000, 50% complete, live
- [Bouncify, $299 monthly](https://datacircle.dev/validate-email-apis/bouncify/299-monthly/llms.txt): $0.598 per 1,000, 50% complete, live
- [Invalid Bounce, $299 pack](https://datacircle.dev/validate-email-apis/invalid-bounce/299-pack/llms.txt): $0.598 per 1,000, 17% complete, live
- [MillionVerifier, $299 pack, 500,000 verification credits, GET /api/v3](https://datacircle.dev/validate-email-apis/millionverifier/299-pack-500000-verification-credits-get-api-v3/llms.txt): $0.598 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 2026-11-02.

- https://kawaa.com?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://kawaa.com/docs/rate-limits/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://kawaa.com/openapi.json?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://kawaa.com/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://kawaa.com/support/api-batch/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://kawaa.com/support/api-file/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://kawaa.com/support/api-single/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://kawaa.com/support/credits/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://kawaa.com/terms?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing