# FiatDock, pay as you go: Email verification API

> Is this email address worth sending to? Syntax, domain DNS (MX, then A/AAAA), disposable/role/free-provider lists, a typo suggestion (gmial.com -> gmail.com), a normalized form and a risk verdict with reasons. No SMTP probe: it vouches for the domain, never the mailbox.

FiatDock'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. FiatDock's docs list 3: Address, Deliverability, Company.
We haven't run FiatDock 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/fiatdock/pay-as-you-go
- [Email validation API: best verification providers compared](https://datacircle.dev/best-email-verification-api.txt)
- Get it: https://fiatdock.com/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- Request: `POST https://fiatdock.com/v1/email/check`
- API key: not needed
- Its API docs: https://fiatdock.com/tools/email_check?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- Sold by: FiatDock (https://fiatdock.com?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: Is this email address worth sending to? Syntax, domain DNS (MX, then A/AAAA), disposable/role/free-provider lists, a typo suggestion (gmial.com -> gmail.com), a normalized form and a risk verdict with reasons. No SMTP probe: it vouches for the domain, never the mailbox.

## 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

- Per second: 2
- Batch: 1

## Speed

- Answer: in the call

## The call

- You send: nothing required. Optional: email
- Method: POST
- Path: /v1/email/check

## About the plan

- Plan: x402 pay per call
- Who can get it: anyone aged 18 or over (or an entity they lawfully represent), with no account or API key, paying each call in USDC on Base or Solana (x402), its terms and footer say it is not available in the restricted jurisdictions they list

## The 18 fields the plan's answer can hold

email address, normalized email, local part, domain, syntax valid, domain exists, MX records, has MX record, has A record, disposable, role address, free provider, typo suggestion, deliverable domain, risk, reasons, method, checked at

## FiatDock's plans (1)

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

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

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

## FiatDock's APIs (4)

- [FiatDock: domain WHOIS API pricing, 1 plan](https://datacircle.dev/domain-whois-apis/fiatdock/pay-as-you-go/llms.txt)
- [FiatDock: email verification API pricing, 1 plan](https://datacircle.dev/validate-email-apis/fiatdock/pay-as-you-go/llms.txt)
- [FiatDock: web scraping API pricing, 1 plan](https://datacircle.dev/web-scraping-apis/fiatdock/pay-as-you-go/llms.txt)
- [FiatDock: Hacker News search API pricing, 1 plan](https://datacircle.dev/hacker-news-search-apis/fiatdock/pay-as-you-go/llms.txt)

## FiatDock: 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
- [DitLead, $150 monthly](https://datacircle.dev/validate-email-apis/ditlead/150-monthly/llms.txt): $1.00 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://fiatdock.com/docs?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://fiatdock.com/openapi.json?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://fiatdock.com/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://fiatdock.com/privacy.html?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://fiatdock.com/terms.html?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://fiatdock.com/tools?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://fiatdock.com/tools/email_check?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing