# PapaCasper, pay as you go: Email verification API

> Validate a single email address: RFC syntax check, MX record lookup on the domain, disposable/temporary-email-provider detection, and role-account detection (info@, admin@, etc.).

PapaCasper's x402 pay per call plan for the email verification API costs $10.00 per 1,000 emails. We check each provider's docs for 6 fields. PapaCasper's docs list 1: Deliverability.
We haven't run PapaCasper through [our email verification API benchmark](https://datacircle.dev/best-email-verification-api.txt) yet.
We rank 4,721 plans for email verification APIs by price. Half the plans cost $2.00 or less per 1,000 emails. This plan costs less per 1,000 emails than 10% of the 4,721 plans. PapaCasper has no free email verification API plan. [734 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.
[PayPerQ's pay-as-you-go plan](https://datacircle.dev/validate-email-apis/payperq/pay-as-you-go-pay-per-request-with-l402-post-api-minerva-validate-emails/llms.txt) costs the least for 10,000 emails a month: $0.06.
[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.
[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/papacasper/pay-as-you-go
- [Email validation API: best verification providers compared](https://datacircle.dev/best-email-verification-api.txt)
- Get it: https://papacasper.com/mcp-docs?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- Request: `POST https://papacasper.com/mcp/pay/email_address_validate`
- API key: not needed
- Its API docs: https://papacasper.com/mcp-docs?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- Sold by: PapaCasper (https://papacasper.com?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing)
- Checked: 2026-11-10

## In the answer

- Completeness: 17%
- Deliverability: ✓

## Price

- $ per 1,000 emails: $10.00
- Per: call
- Billing: pay as you go

## Aggregators

- Aggregators: none

## Charges

- Also pays for: nothing else

## In their words

- Their pitch: Validate a single email address: RFC syntax check, MX record lookup on the domain, disposable/temporary-email-provider detection, and role-account detection (info@, admin@, etc.).

## Data

- What it checks: format, mail servers, disposable domains, role addresses
- Keep data: no limit
- Use data: You may use our sites for lawful purposes. Please do not abuse them: no attempts to break into, overload, or disrupt the sites, the MCP Toolbelt, or the public DNS service, and no use of any of them for illegal activity.

## Plan

- Pay: per call

## Rate limit

- Batch: 1

## Speed

- Answer: in the call

## The call

- You send: email
- Method: POST
- Path: /mcp/pay/email_address_validate

## About the plan

- Plan: x402 pay per call
- Who can get it: anyone with a wallet paying each call in USDC on Base through x402, with no signup

## The 4 fields the plan's answer can hold

syntax valid, MX record, disposable, role account

## PapaCasper's plans (3)

- [PapaCasper, pay as you go](https://datacircle.dev/validate-email-apis/papacasper/pay-as-you-go/llms.txt): $10.00 per 1,000, 17% complete
- [PapaCasper, $9 monthly](https://datacircle.dev/validate-email-apis/papacasper/9-monthly/llms.txt): $4.50 per 1,000, 17% complete
- [PapaCasper, $29 monthly](https://datacircle.dev/validate-email-apis/papacasper/29-monthly/llms.txt): $2.90 per 1,000, 17% complete

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

- `POST /mcp/pay/email_address_validate`: [PapaCasper, pay as you go](https://datacircle.dev/validate-email-apis/papacasper/pay-as-you-go/llms.txt)

## PapaCasper's APIs (5)

- [PapaCasper GitHub repository API pricing, 3 plans](https://datacircle.dev/github-repository-apis/papacasper/pay-as-you-go/llms.txt)
- [PapaCasper Tech stack API pricing, 3 plans](https://datacircle.dev/company-technology-apis/papacasper/pay-as-you-go/llms.txt)
- [PapaCasper Domain WHOIS API pricing, 3 plans](https://datacircle.dev/domain-whois-apis/papacasper/pay-as-you-go/llms.txt)
- [PapaCasper Email verification API pricing, 3 plans](https://datacircle.dev/validate-email-apis/papacasper/pay-as-you-go/llms.txt)
- [PapaCasper Web scraping API pricing, 3 plans](https://datacircle.dev/web-scraping-apis/papacasper/pay-as-you-go/llms.txt)

## PapaCasper: email verification API alternatives

[PapaCasper alternatives: other email verification API providers by price](https://datacircle.dev/papacasper-alternatives.txt)

We list other providers' plans closest to this plan in price per 1,000 emails.

- [Tuski, pay as you go](https://datacircle.dev/validate-email-apis/tuski/pay-as-you-go/llms.txt): $10.00 per 1,000, 50% complete
- [Clearout, $1,000 pack, 500,000 credits, POST /email_verify/instant, Instant Verify, full](https://datacircle.dev/validate-email-apis/clearout/1000-pack-500000-credits-post-email-verify-instant-instant-verify-full/llms.txt): $10.00 per 1,000, 50% complete, live
- [InboxPolicy, pay as you go, Pay-per-call (x402), POST /v1/decide](https://datacircle.dev/validate-email-apis/inboxpolicy/pay-as-you-go-pay-per-call-x402-post-v1-decide/llms.txt): $10.00 per 1,000, 50% complete, 72 hours
- [SyncGTM, $50 pack](https://datacircle.dev/validate-email-apis/syncgtm/50-pack/llms.txt): $10.00 per 1,000, 33% complete
- [Mail Security Tools, pay as you go](https://datacircle.dev/validate-email-apis/mail-security-tools/pay-as-you-go/llms.txt): $10.00 per 1,000, 17% 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 2026-11-10.

- https://papacasper.com/llms.txt?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://papacasper.com/mcp-docs?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://papacasper.com/openapi.json?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://papacasper.com/terms?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing