# OnchainCheck, pay as you go: Email verification API

> Is this email address worth sending to? Checks syntax, the domain's mail servers (MX, implicit MX, null MX) and mail provider, disposable domains (10,000+ known), role accounts (info@, sales@), free providers, and misspelled domains (gmial.com suggests gmail.com). Returns valid, risky or invalid with a 0-100 score and reasons. No SMTP probe.

OnchainCheck's x402 pay per call plan for the email verification API costs $2.00 per 1,000 emails. We check each provider's docs for 6 fields. OnchainCheck's docs list 4: Address, Deliverability, Confidence, Company.
We haven't run OnchainCheck 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 48% 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/onchaincheck/pay-as-you-go
- [Email validation API: best verification providers compared](https://datacircle.dev/best-email-verification-api.txt)
- Get it: https://onchaincheck.dev?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- Request: `GET https://onchaincheck.dev/email/validate`
- API key: not needed
- Its API docs: https://onchaincheck.dev/openapi.json?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing#/paths/~1email~1validate
- Sold by: OnchainCheck (https://onchaincheck.dev?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing)
- Checked: 2026-11-09

## In the answer

- Completeness: 67%
- Address: ✓
- Deliverability: ✓
- Confidence: ✓
- Company: ✓

## Price

- $ per 1,000 emails: $2.00
- 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: Is this email address worth sending to? Checks syntax, the domain's mail servers (MX, implicit MX, null MX) and mail provider, disposable domains (10,000+ known), role accounts (info@, sales@), free providers, and misspelled domains (gmial.com suggests gmail.com). Returns valid, risky or invalid with a 0-100 score and reasons. No SMTP 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: 1

## Speed

- Answer: in the call

## The call

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

## About the plan

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

## The 19 fields the plan's answer can hold

email, normalized email, domain, verdict, score, reasons, syntax valid, MX host, MX priority, implicit MX, null MX, accepts mail, mail provider, disposable, role, free, suggestion, checked at, note

## OnchainCheck's plans (1)

- [OnchainCheck, pay as you go](https://datacircle.dev/validate-email-apis/onchaincheck/pay-as-you-go/llms.txt): $2.00 per 1,000, 67% complete

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

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

## OnchainCheck's APIs (8)

- [OnchainCheck: company open jobs API pricing, 1 plan](https://datacircle.dev/company-open-job-apis/onchaincheck/pay-as-you-go/llms.txt)
- [OnchainCheck: tech stack API pricing, 1 plan](https://datacircle.dev/company-technology-apis/onchaincheck/pay-as-you-go/llms.txt)
- [OnchainCheck: domain WHOIS API pricing, 1 plan](https://datacircle.dev/domain-whois-apis/onchaincheck/pay-as-you-go/llms.txt)
- [OnchainCheck: email verification API pricing, 1 plan](https://datacircle.dev/validate-email-apis/onchaincheck/pay-as-you-go/llms.txt)
- [OnchainCheck: email finder API pricing, 1 plan](https://datacircle.dev/find-email-apis/onchaincheck/pay-as-you-go/llms.txt)
- [OnchainCheck: web scraping API pricing, 1 plan](https://datacircle.dev/web-scraping-apis/onchaincheck/pay-as-you-go/llms.txt)
- [OnchainCheck: company enrichment API pricing, 1 plan, GET /company/enrich](https://datacircle.dev/company-enrichment-apis/onchaincheck/pay-as-you-go-x402-pay-per-call-get-company-enrich/llms.txt)
- [OnchainCheck: company enrichment API pricing, 1 plan, GET /sec/company](https://datacircle.dev/company-enrichment-apis/onchaincheck/pay-as-you-go-x402-pay-per-call-get-sec-company/llms.txt)
- [OnchainCheck: company enrichment API pricing, 1 plan, GET /vat/validate](https://datacircle.dev/company-enrichment-apis/onchaincheck/pay-as-you-go-x402-pay-per-call-get-vat-validate/llms.txt)
- [OnchainCheck: job postings API pricing, 1 plan, GET /jobs/new](https://datacircle.dev/job-posting-apis/onchaincheck/pay-as-you-go-x402-pay-per-call-get-jobs-new/llms.txt)
- [OnchainCheck: job postings API pricing, 1 plan, GET /jobs/search](https://datacircle.dev/job-posting-apis/onchaincheck/pay-as-you-go-x402-pay-per-call-get-jobs-search/llms.txt)

## OnchainCheck: email verification API alternatives

- [MillionPhones, $60 monthly](https://datacircle.dev/validate-email-apis/millionphones/60-monthly/llms.txt): $2.00 per 1,000, 33% complete, live
- [Verifly, $10 pack, Starter, POST /verify/bulk](https://datacircle.dev/validate-email-apis/verifly/10-pack-starter-post-verify-bulk/llms.txt): $2.00 per 1,000, 33% complete, live
- [Verimail, $20 pack](https://datacircle.dev/validate-email-apis/verimail/20-pack/llms.txt): $2.00 per 1,000, 50% complete, live
- [NullBounce, $10 pack](https://datacircle.dev/validate-email-apis/nullbounce/10-pack/llms.txt): $2.00 per 1,000, 33% complete, live
- [GlianaAI, pay as you go](https://datacircle.dev/validate-email-apis/glianaai/pay-as-you-go/llms.txt): $2.00 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 2026-11-09.

- https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://onchaincheck.dev?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://onchaincheck.dev/openapi.json?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing