# Kadec0, pay as you go: Email verification API

> Email validation and email list cleaning. Checks each email address for RFC syntax, a live MX record lookup returning the real mail hosts, disposable-domain detection, role-account flags (info@, sales@, noreply@), and a free-provider flag, rolled into a per-address ok/risky/invalid verdict with reasons. Batch up to 25 email addresses per call. Domain-level DNS only, no SMTP mailbox probe.

Kadec0's x402 pay per call plan for the email verification API costs $1.20 per 1,000 emails. We check each provider's docs for 6 fields. Kadec0's docs list 3: Address, Deliverability, Company.
We haven't run Kadec0 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 64% 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/kadec0/pay-as-you-go
- [Email validation API: best verification providers compared](https://datacircle.dev/best-email-verification-api.txt)
- Get it: https://api.kadec0.xyz/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- Request: `GET https://api.kadec0.xyz/v1/email-validate`
- API key: not needed
- Its API docs: https://api.kadec0.xyz/docs?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing#/default/handler_v1_email_validate_get
- Sold by: Kadec0 (https://api.kadec0.xyz?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: $1.20
- Per: result
- Billing: pay as you go

## Aggregators

- Aggregators: none

## Charges

- Also pays for: nothing else

## In their words

- Their pitch: Email validation and email list cleaning. Checks each email address for RFC syntax, a live MX record lookup returning the real mail hosts, disposable-domain detection, role-account flags (info@, sales@, noreply@), and a free-provider flag, rolled into a per-address ok/risky/invalid verdict with reasons. Batch up to 25 email addresses per call. Domain-level DNS only, no SMTP mailbox probe.

## 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: 25

## Speed

- Answer: in the call

## The call

- You send: one of emails or email
- Method: GET
- Path: /v1/email-validate

## 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 12 fields the plan's answer can hold

email, normalized email, local part, domain, syntax valid, MX found, MX records, disposable domain, role account, free provider, reasons, verdict

## Kadec0's plans (1)

- [Kadec0, pay as you go](https://datacircle.dev/validate-email-apis/kadec0/pay-as-you-go/llms.txt): $1.20 per 1,000, 50% complete

## Kadec0's calls for this API (1)

- `GET /v1/email-validate`: [Kadec0, pay as you go](https://datacircle.dev/validate-email-apis/kadec0/pay-as-you-go/llms.txt)

## Kadec0's APIs (9)

- [Kadec0: GitHub repository API pricing, 1 plan](https://datacircle.dev/github-repository-apis/kadec0/pay-as-you-go/llms.txt)
- [Kadec0: Hacker News search API pricing, 1 plan](https://datacircle.dev/hacker-news-search-apis/kadec0/pay-as-you-go/llms.txt)
- [Kadec0: company enrichment API pricing, 1 plan](https://datacircle.dev/company-enrichment-apis/kadec0/pay-as-you-go/llms.txt)
- [Kadec0: tech stack API pricing, 1 plan](https://datacircle.dev/company-technology-apis/kadec0/pay-as-you-go/llms.txt)
- [Kadec0: email verification API pricing, 1 plan](https://datacircle.dev/validate-email-apis/kadec0/pay-as-you-go/llms.txt)
- [Kadec0: related keywords API pricing, 1 plan](https://datacircle.dev/related-keywords-apis/kadec0/pay-as-you-go/llms.txt)
- [Kadec0: web scraping API pricing, 1 plan](https://datacircle.dev/web-scraping-apis/kadec0/pay-as-you-go/llms.txt)
- [Kadec0: web search API pricing, 1 plan, GET /v1/serp-batch](https://datacircle.dev/web-search-apis/kadec0/pay-as-you-go-x402-pay-per-call-get-v1-serp-batch/llms.txt)
- [Kadec0: web search API pricing, 1 plan, GET /v1/serp-multi](https://datacircle.dev/web-search-apis/kadec0/pay-as-you-go-x402-pay-per-call-get-v1-serp-multi/llms.txt)
- [Kadec0: web search API pricing, 1 plan, GET /v1/serp-read](https://datacircle.dev/web-search-apis/kadec0/pay-as-you-go-x402-pay-per-call-get-v1-serp-read/llms.txt)
- [Kadec0: web search API pricing, 1 plan, GET /v1/serp](https://datacircle.dev/web-search-apis/kadec0/pay-as-you-go-x402-pay-per-call-get-v1-serp/llms.txt)
- [Kadec0: domain WHOIS API pricing, 1 plan, GET /v1/whois-bulk](https://datacircle.dev/domain-whois-apis/kadec0/pay-as-you-go-x402-pay-per-call-get-v1-whois-bulk/llms.txt)
- [Kadec0: domain WHOIS API pricing, 1 plan, GET /v1/domain-age-check](https://datacircle.dev/domain-whois-apis/kadec0/pay-as-you-go-x402-pay-per-call-get-v1-domain-age-check/llms.txt)
- [Kadec0: domain WHOIS API pricing, 1 plan, GET /v1/domain-info](https://datacircle.dev/domain-whois-apis/kadec0/pay-as-you-go-x402-pay-per-call-get-v1-domain-info/llms.txt)

## Kadec0: email verification API alternatives

- [Prime Verifier, $120 pack, Pay-As-You-Go 100,000 credits, POST /v1/verify/single](https://datacircle.dev/validate-email-apis/prime-verifier/120-pack-pay-as-you-go-100000-credits-post-v1-verify-single/llms.txt): $1.20 per 1,000, 50% complete
- [verifications.email, $12 pack, 10,000 credits, POST /api/v1/verify/batch](https://datacircle.dev/validate-email-apis/verifications-email/12-pack-10000-credits-post-api-v1-verify-batch/llms.txt): $1.20 per 1,000, 67% complete, live
- [NullBounce, $30 pack](https://datacircle.dev/validate-email-apis/nullbounce/30-pack/llms.txt): $1.20 per 1,000, 33% complete, live
- [Unspam, $258.40 monthly, Custom plan, over 100,000 verifications a month, POST /email-verification/instant-checks](https://datacircle.dev/validate-email-apis/unspam/252-monthly-custom-plan-over-100000-verifications-a-month-post-email-verification-instant-checks/llms.txt): $1.20 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://api.kadec0.xyz/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://api.kadec0.xyz/.well-known/x402?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://api.kadec0.xyz/docs?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://api.kadec0.xyz/openapi.json?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing