# Nero Labs, pay as you go: Email verification API

> Checks one email address and returns valid, risky or invalid with the reasons: address format, whether the domain can receive mail (live MX lookup), known throwaway domains (mailinator and others, invalid), shared inboxes like info@ or sales@ (risky), likely typos such as gmial.com with the fix in didYouMean, and free providers such as gmail.com (flag only). Does not ping the mailbox (no SMTP), so valid is not a delivery guarantee.

Nero Labs's x402 pay per call plan for the email verification API costs $1.00 per 1,000 emails. We check each provider's docs for 6 fields. Nero Labs's docs list 3: Address, Deliverability, Company.
We haven't run Nero Labs through [our email verification API benchmark](https://datacircle.dev/best-email-verification-api.txt) yet.
We rank 4,337 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 67% of the 4,337 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), [Validemail.co](https://datacircle.dev/validate-email-apis/validemail-co/9-90-monthly-9-90-month-get-api-v1-validate/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/nero-labs/pay-as-you-go
- [Email validation API: best verification providers compared](https://datacircle.dev/best-email-verification-api.txt)
- Get it: https://x402-agent-tools.nerolabs.workers.dev?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- Request: `GET https://x402-agent-tools.nerolabs.workers.dev/email-check`
- API key: not needed
- Its API docs: https://x402-agent-tools.nerolabs.workers.dev/openapi.json?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing#/paths/~1email-check
- Sold by: Nero Labs (https://x402-agent-tools.nerolabs.workers.dev?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing)
- Checked: 2026-11-09

## In the answer

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

## Price

- $ per 1,000 emails: $1.00
- Per: call
- Billing: pay as you go

## Aggregators

- Aggregators: none

## Charges

- Also pays for: nothing else

## Not found

- $ per 1,000: $0.00

## In their words

- Their pitch: Checks one email address and returns valid, risky or invalid with the reasons: address format, whether the domain can receive mail (live MX lookup), known throwaway domains (mailinator and others, invalid), shared inboxes like info@ or sales@ (risky), likely typos such as gmial.com with the fix in didYouMean, and free providers such as gmail.com (flag only). Does not ping the mailbox (no SMTP), so valid is not a delivery guarantee.

## Data

- What it checks: format, mail servers, disposable domains, role addresses
- Keep data: no API terms
- Use data: no API terms

## Plan

- Pay: per call

## Rate limit

- Batch: 1

## Speed

- Answer: in the call

## The call

- You send: email
- Method: GET
- Path: /email-check

## About the plan

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

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

email, status, reason, all reasons, normalized email, domain, syntax valid, accepts mail, mail server, disposable, role account, free provider, did you mean, note

## Nero Labs's plans (1)

- [Nero Labs, pay as you go](https://datacircle.dev/validate-email-apis/nero-labs/pay-as-you-go/llms.txt): $1.00 per 1,000, 50% complete

## Nero Labs's calls for this API (1)

- `GET /email-check`: [Nero Labs, pay as you go](https://datacircle.dev/validate-email-apis/nero-labs/pay-as-you-go/llms.txt)

## Nero Labs's APIs (6)

- [Nero Labs: tech stack API pricing, 1 plan](https://datacircle.dev/company-technology-apis/nero-labs/pay-as-you-go/llms.txt)
- [Nero Labs: domain WHOIS API pricing, 1 plan](https://datacircle.dev/domain-whois-apis/nero-labs/pay-as-you-go/llms.txt)
- [Nero Labs: email verification API pricing, 1 plan](https://datacircle.dev/validate-email-apis/nero-labs/pay-as-you-go/llms.txt)
- [Nero Labs: web scraping API pricing, 1 plan](https://datacircle.dev/web-scraping-apis/nero-labs/pay-as-you-go/llms.txt)
- [Nero Labs: business verification API pricing, 1 plan, POST /company/ireland](https://datacircle.dev/business-verification-apis/nero-labs/pay-as-you-go-x402-pay-per-call-post-company-ireland/llms.txt)
- [Nero Labs: business verification API pricing, 1 plan, POST /company/uk-risk-report](https://datacircle.dev/business-verification-apis/nero-labs/pay-as-you-go-x402-pay-per-call-post-company-uk-risk-report/llms.txt)
- [Nero Labs: business verification API pricing, 1 plan, POST /company/uk-trust-check](https://datacircle.dev/business-verification-apis/nero-labs/pay-as-you-go-x402-pay-per-call-post-company-uk-trust-check/llms.txt)
- [Nero Labs: company enrichment API pricing, 1 plan, POST /company/poland](https://datacircle.dev/company-enrichment-apis/nero-labs/pay-as-you-go-x402-pay-per-call-post-company-poland/llms.txt)
- [Nero Labs: company enrichment API pricing, 1 plan, POST /company/uk](https://datacircle.dev/company-enrichment-apis/nero-labs/pay-as-you-go-x402-pay-per-call-post-company-uk/llms.txt)

## Nero Labs: email verification API alternatives

- [Prime Verifier, $200 pack, Pay-As-You-Go 200,000 credits, POST /v1/verify/single](https://datacircle.dev/validate-email-apis/prime-verifier/200-pack-pay-as-you-go-200000-credits-post-v1-verify-single/llms.txt): $1.00 per 1,000, 50% complete
- [BillionVerify, $20 pack, Starter, POST /verify/bulk](https://datacircle.dev/validate-email-apis/billionverify/20-pack-starter-post-verify-bulk/llms.txt): $1.00 per 1,000, 67% complete, live
- [MillionPhones, $100 monthly](https://datacircle.dev/validate-email-apis/millionphones/100-monthly/llms.txt): $1.00 per 1,000, 33% complete, live
- [DeBounce, top-up from $200, 200K credits, GET /v1/, Single email validation](https://datacircle.dev/validate-email-apis/debounce/top-up-from-200-200k-credits-get-v1/llms.txt): $1.00 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 2026-11-09.

- https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://x402-agent-tools.nerolabs.workers.dev?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://x402-agent-tools.nerolabs.workers.dev/.well-known/x402?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://x402-agent-tools.nerolabs.workers.dev/llms.txt?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://x402-agent-tools.nerolabs.workers.dev/openapi.json?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing