# Proofwire, free: Email verification API

> Syntax, domain records, live mailbox probe

Proofwire's Free plan for the email verification API costs $0.00 per 1,000 emails. Proofwire's docs list 2 of the 6 fields on our checklist: Deliverability, Confidence.
We haven't run Proofwire through [our email verification API benchmark](https://datacircle.dev/best-email-verification-api.txt) yet.
This plan is free. We rank 4,039 plans for email verification APIs by price. Half the plans cost $1.999 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/proofwire/free
- [Email validation API: 200+ verification providers compared](https://datacircle.dev/best-email-verification-api.txt)
- Get it: https://proofwire.app/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- Request: `POST https://api.proofwire.app/v1/email`
- API key: with the plan, on https://proofwire.app/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- Its API docs: https://proofwire.app/docs?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- Sold by: Proofwire (https://proofwire.app?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: Email Find · Phone Verify · IP Address Verify · Company Profile

## Overage

- Units cap: hard

## Not found

- $ per 1,000: $0.00

## Catch-all

- $ per 1,000: $0.00

## In their words

- Their pitch: Syntax, domain records, live mailbox probe

## Data

- Freshness: live
- What it checks: format, mail servers, mailbox
- Keep data: no limit
- Use data: Checking whether contact details you already hold are real and reachable: cleaning a list before you send to it, screening a signup form, deciding whether a number is worth dialling, scoring an address at checkout. [...] What it is not for: Discovering contact details you do not have. [...] Validating a list you have no right to hold. [...] Sending to people who have not agreed to hear from you. [...] Calling numbers on a Do Not Call registry. [...] Surveillance or profiling of a specific individual. [...] Reselling the raw results as a data product. [...] Have a lawful basis for the data you send us, use the service within the acceptable use policy, and keep your API keys secret.

## Plan

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

## Rate limit

- Batch: 1

## Speed

- Answer: in the call

## The call

- You send: value, Content-Type header "application/json". Optional: Idempotency-Key header
- Method: POST
- Path: /v1/email

## About the plan

- Plan: Free
- Who can get it: anyone

## The 7 fields the plan's answer can hold

verdict, confidence, risk, evidence, provider trace, credits charged, suggested correction

## Proofwire's plans (1)

- [Proofwire, free](https://datacircle.dev/validate-email-apis/proofwire/free/llms.txt): $0.00 per 1,000, 33% complete, live

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

- `POST /v1/email`: [Proofwire, free](https://datacircle.dev/validate-email-apis/proofwire/free/llms.txt)

## Proofwire's APIs (5)

- [Proofwire: company enrichment API pricing, 1 plan](https://datacircle.dev/company-enrichment-apis/proofwire/free/llms.txt)
- [Proofwire: email verification API pricing, 1 plan](https://datacircle.dev/validate-email-apis/proofwire/free/llms.txt)
- [Proofwire: email finder API pricing, 1 plan](https://datacircle.dev/find-email-apis/proofwire/free/llms.txt)
- [Proofwire: IP company lookup API pricing, 1 plan](https://datacircle.dev/ip-company-lookup-apis/proofwire/free/llms.txt)
- [Proofwire: phone validation API pricing, 1 plan](https://datacircle.dev/validate-phone-apis/proofwire/free/llms.txt)

## Proofwire: email verification API alternatives

- [MailTester Ninja, free, No token](https://datacircle.dev/validate-email-apis/mailtester-ninja/free-no-token/llms.txt): $0.00 per 1,000, 50% complete, live
- [Giggal, free trial, POST /v1/verify-batch](https://datacircle.dev/validate-email-apis/giggal/free-trial-post-v1-verify-batch/llms.txt): $0.00 per 1,000, 67% complete, live
- [Enrich.so, free, POST /email-validation](https://datacircle.dev/validate-email-apis/enrich-so/free/llms.txt): $0.00 per 1,000, 50% complete, live
- [KaijuVerifier, free, POST /api/v1/jobs, Submit an async bulk job with the SMTP probe](https://datacircle.dev/validate-email-apis/kaijuverifier/free-free-post-api-v1-jobs/llms.txt): $0.00 per 1,000, 50% complete, live
- [MailboxValidator, free, API-FREE](https://datacircle.dev/validate-email-apis/mailboxvalidator/free-api-free/llms.txt): $0.00 per 1,000, 67% 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://proofwire.app?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://proofwire.app/changelog?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://proofwire.app/docs?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://proofwire.app/integrations?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://proofwire.app/legal/acceptable-use?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://proofwire.app/legal/privacy?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://proofwire.app/legal/terms?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://proofwire.app/mcp?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://proofwire.app/sdks?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://proofwire.app/signup?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing