# QuantAgentShop, pay as you go: Email verification API

> Email address check without sending mail. Returns syntax validity, the normalised address, whether the domain accepts mail (MX, null MX or address fallback), and flags for disposable, role (info@, support@) and free webmail addresses, with a verdict.

QuantAgentShop's Pay per call with x402 plan for the email verification API costs $9.90 per 1,000 emails. We check each provider's docs for 6 fields. QuantAgentShop's docs list 3: Address, Deliverability, Company.
We haven't run QuantAgentShop through [our email verification API benchmark](https://datacircle.dev/best-email-verification-api.txt) yet.
We rank 4,207 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 11% of the 4,207 plans.
[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/quantagentshop/pay-as-you-go
- [Email validation API: best verification providers compared](https://datacircle.dev/best-email-verification-api.txt)
- Get it: https://quantagentshop.com?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- Request: `POST https://quantagentshop.com/v1/email-check`
- API key: not needed
- Its API docs: https://quantagentshop.com/openapi.json?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing#/paths/~1v1~1email-check
- Sold by: QuantAgentShop (https://quantagentshop.com?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing)
- Checked: 2026-11-08

## In the answer

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

## Price

- $ per 1,000 emails: $9.90
- Per: call
- Billing: pay as you go

## Aggregators

- Aggregators: none

## Charges

- Also pays for: nothing else

## In their words

- Their pitch: Email address check without sending mail. Returns syntax validity, the normalised address, whether the domain accepts mail (MX, null MX or address fallback), and flags for disposable, role (info@, support@) and free webmail addresses, with a verdict.

## Data

- What it checks: format, mail servers, disposable domains, role addresses
- Keep data: no limit
- Use data: What this shop makes from your input (PDFs, QR codes, summaries, extractions, grades, scores, hashes and the layout of every result) is yours to use, store and redistribute freely. Data that comes from a third party stays under that source's terms, linked below, where a licence asks for credit, the result carries an attribution line to keep with it. [...] Do not use the service for anything unlawful. [...] Results are provided as they come from public sources and providers, without warranty.

## Plan

- Pay: per call

## Rate limit

- Concurrent: 1
- Batch: 1

## Speed

- Answer: in the call

## The call

- You send: email
- Method: POST
- Path: /v1/email-check

## About the plan

- Plan: Pay per call with x402
- Who can get it: anyone, with no account or API key, paying each call in USDC on Base (x402)

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

email, normalized email, syntax valid, domain, MX records, null MX, accepts mail, disposable, role account, free provider, verdict, reason, notice, checked at

## QuantAgentShop's plans (1)

- [QuantAgentShop, pay as you go](https://datacircle.dev/validate-email-apis/quantagentshop/pay-as-you-go/llms.txt): $9.90 per 1,000, 50% complete

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

- `POST /v1/email-check`: [QuantAgentShop, pay as you go](https://datacircle.dev/validate-email-apis/quantagentshop/pay-as-you-go/llms.txt)

## QuantAgentShop's APIs (6)

- [QuantAgentShop: business verification API pricing, 1 plan](https://datacircle.dev/business-verification-apis/quantagentshop/pay-as-you-go/llms.txt)
- [QuantAgentShop: domain WHOIS API pricing, 1 plan](https://datacircle.dev/domain-whois-apis/quantagentshop/pay-as-you-go/llms.txt)
- [QuantAgentShop: email verification API pricing, 1 plan](https://datacircle.dev/validate-email-apis/quantagentshop/pay-as-you-go/llms.txt)
- [QuantAgentShop: IP company lookup API pricing, 1 plan](https://datacircle.dev/ip-company-lookup-apis/quantagentshop/pay-as-you-go/llms.txt)
- [QuantAgentShop: phone validation API pricing, 1 plan](https://datacircle.dev/validate-phone-apis/quantagentshop/pay-as-you-go/llms.txt)
- [QuantAgentShop: web scraping API pricing, 1 plan](https://datacircle.dev/web-scraping-apis/quantagentshop/pay-as-you-go/llms.txt)

## QuantAgentShop: email verification API alternatives

- [GetProspect, $99 monthly, Growth 5k, POST /v2/email-verifications](https://datacircle.dev/validate-email-apis/getprospect/99-monthly-growth-5k-post-v2-email-verifications/llms.txt): $9.90 per 1,000, 50% complete, live
- [ZeroBounce, $99 monthly, ZeroBounce ONE, 10,000 credits a month, POST /v2/validatebatch](https://datacircle.dev/validate-email-apis/zerobounce/99-monthly-zerobounce-one-10000-credits-a-month-post-v2-validatebatch/llms.txt): $9.90 per 1,000, 83% complete, live
- [FindLeadEmails, $99 pack](https://datacircle.dev/validate-email-apis/findleademails/99-pack/llms.txt): $9.90 per 1,000, 33% complete, live
- [Databar, $495 monthly](https://datacircle.dev/validate-email-apis/databar/495-monthly/llms.txt): $9.90 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 2026-11-08.

- https://quantagentshop.com?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://quantagentshop.com/llms.txt?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://quantagentshop.com/openapi.json?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://quantagentshop.com/policies?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing