# Agent402 Tools, pay as you go: Email verification API

> Validate an email address: syntax check plus live MX record lookup on the domain (deliverability signal, not a guarantee).

Agent402 Tools'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. Agent402 Tools's docs list 3: Address, Deliverability, Company.
We haven't run Agent402 Tools 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/agent402-tools/pay-as-you-go
- [Email validation API: best verification providers compared](https://datacircle.dev/best-email-verification-api.txt)
- Get it: https://agent402.tools/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- Request: `POST https://agent402.tools/api/email-validate`
- API key: not needed
- Its API docs: https://agent402.tools/tools/email-validate?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- Sold by: Agent402 Tools (https://agent402.tools?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: Validate an email address: syntax check plus live MX record lookup on the domain (deliverability signal, not a guarantee).

## Data

- What it checks: format, mail servers
- Keep data: no limit
- Use data: Don't use the service to break the law, infringe others' rights, or attack the service or third parties (e.g. using the URL-fetching tools against targets you don't control). [...] Don't attempt to bypass rate limits, payment, or the proof-of-work gate, or to disrupt availability for others. [...] Don't use the service to create malware or exploits for unauthorized use, to defraud, phish, spam, or deceive, or to process other people's personal data unlawfully. You are responsible for the inputs you send and how you use the outputs.

## Plan

- Pay: per call

## Rate limit

- Batch: 1

## Speed

- Answer: in the call

## The call

- You send: email
- Method: POST
- Path: /api/email-validate

## About the plan

- Plan: x402 pay per call
- Who can get it: anyone at least 18 (or the age of majority where they live, if higher), able to form a binding contract, not barred from receiving services under U.S. or other applicable law, not in an embargoed jurisdiction and not on a U.S. government sanctions list, with no account or API key, paying each call in USDC (or USDG on Robinhood Chain) over x402 or MPP

## The 5 fields the plan's answer can hold

email, syntax valid, domain, MX records, deliverable domain

## Agent402 Tools's plans (1)

- [Agent402 Tools, pay as you go](https://datacircle.dev/validate-email-apis/agent402-tools/pay-as-you-go/llms.txt): $1.00 per 1,000, 50% complete

## Agent402 Tools's calls for this API (1)

- `POST /api/email-validate`: [Agent402 Tools, pay as you go](https://datacircle.dev/validate-email-apis/agent402-tools/pay-as-you-go/llms.txt)

## Agent402 Tools's APIs (14)

- [Agent402 Tools: company enrichment API pricing, 1 plan](https://datacircle.dev/company-enrichment-apis/agent402-tools/pay-as-you-go/llms.txt)
- [Agent402 Tools: tech stack API pricing, 1 plan](https://datacircle.dev/company-technology-apis/agent402-tools/pay-as-you-go/llms.txt)
- [Agent402 Tools: domain WHOIS API pricing, 1 plan](https://datacircle.dev/domain-whois-apis/agent402-tools/pay-as-you-go/llms.txt)
- [Agent402 Tools: email verification API pricing, 1 plan](https://datacircle.dev/validate-email-apis/agent402-tools/pay-as-you-go/llms.txt)
- [Agent402 Tools: image search API pricing, 1 plan](https://datacircle.dev/image-search-apis/agent402-tools/pay-as-you-go/llms.txt)
- [Agent402 Tools: IP company lookup API pricing, 1 plan](https://datacircle.dev/ip-company-lookup-apis/agent402-tools/pay-as-you-go/llms.txt)
- [Agent402 Tools: news API pricing, 1 plan](https://datacircle.dev/news-apis/agent402-tools/pay-as-you-go/llms.txt)
- [Agent402 Tools: search autocomplete API pricing, 1 plan](https://datacircle.dev/search-autocomplete-apis/agent402-tools/pay-as-you-go/llms.txt)
- [Agent402 Tools: video search API pricing, 1 plan](https://datacircle.dev/video-search-apis/agent402-tools/pay-as-you-go/llms.txt)
- [Agent402 Tools: GitHub repository API pricing, 1 plan](https://datacircle.dev/github-repository-apis/agent402-tools/pay-as-you-go/llms.txt)
- [Agent402 Tools: X post API pricing, 1 plan](https://datacircle.dev/x-post-apis/agent402-tools/pay-as-you-go/llms.txt)
- [Agent402 Tools: web scraping API pricing, 1 plan, POST /api/render](https://datacircle.dev/web-scraping-apis/agent402-tools/pay-as-you-go-x402-pay-per-call-post-api-render/llms.txt)
- [Agent402 Tools: web scraping API pricing, 1 plan, POST /api/extract](https://datacircle.dev/web-scraping-apis/agent402-tools/pay-as-you-go-x402-pay-per-call-post-api-extract/llms.txt)
- [Agent402 Tools: web search API pricing, 1 plan, GET /api/search](https://datacircle.dev/web-search-apis/agent402-tools/pay-as-you-go-x402-pay-per-call-get-api-search/llms.txt)
- [Agent402 Tools: web search API pricing, 1 plan, GET /api/search-lite](https://datacircle.dev/web-search-apis/agent402-tools/pay-as-you-go-x402-pay-per-call-get-api-search-lite/llms.txt)
- [Agent402 Tools: X profile API pricing, 1 plan, POST /api/x-users-lookup](https://datacircle.dev/x-profile-apis/agent402-tools/pay-as-you-go-x402-pay-per-call-post-api-x-users-lookup/llms.txt)
- [Agent402 Tools: X profile API pricing, 1 plan, POST /api/x-user](https://datacircle.dev/x-profile-apis/agent402-tools/pay-as-you-go-x402-pay-per-call-post-api-x-user/llms.txt)

## Agent402 Tools: 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
- [Agent Utility Suite, pay as you go](https://datacircle.dev/validate-email-apis/agent-utility-suite/pay-as-you-go/llms.txt): $1.00 per 1,000, 67% 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 2026-11-09.

- https://agent402.tools?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://agent402.tools/api/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://agent402.tools/llms.txt?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://agent402.tools/openapi.json?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://agent402.tools/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://agent402.tools/terms?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://agent402.tools/tools/email-validate?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing