Datacircle

fourzerotwo pricing: email verification API

fourzerotwo's siteThis page as plain textEmail validation API: best verification providers comparedfourzerotwo: email verification API alternatives

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33% complete: 2 of the 6 fields on our checklistSee the 6 fields
$0.00per 1,000 emailsWe ran fourzerotwo in our email verification API benchmark. We didn't score any fourzerotwo plan.This plan is free. We rank 4,468 plans for email verification APIs by price. Half the plans cost $2.00 or less per 1,000 emails. See the best free email verification API plan.treg's top-up from $10 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 costs the least for 10,000 emails a month: $0.05.Disify's $9 monthly plan (/email) covers any number of emails. Disify's $9 monthly plan costs less up front than treg's top-up from $10.Validemail.co, pingutil and looot are the best email verification API providers in the Datacircle benchmark.
Type a number to see the cheapest fourzerotwo plan for that many emails. The table below then sorts the other plans by what each costs.
Plan: Free key one of fourzerotwo's 5 plans
Call: GET /v1/validators/email fourzerotwo's only call for this API
API: Email verification API one of fourzerotwo's 8 APIs

About this item

  • Freshness. We don't know how fresh this plan's data is.
  • 2 of the 6 fields on our checklist. Deliverability, Company.
  • Nothing to pay. You get up to 15,000 calls a month.
  • One call. You send email to GET /v1/validators/email.
  • Who can get it: anyone with an email address. Keep data: no API terms. Use data: Keep the attribution when you show the data..

fourzerotwo: email verification API alternatives

fourzerotwo alternatives: other email verification API providers by price

The table starts with fourzerotwo's cheapest paid plan. Next come plans from other providers with the price per 1,000 emails closest to fourzerotwo's.

fourzerotwo, pay as you goPrime Verifier, $200 pack, Pay-As-You-Go 200,000 credits, POST /v1/verify/singleBillionVerify, $20 pack, Starter, POST /verify/bulkMillionPhones, $100 monthlyDeBounce, top-up from $200, 200K credits, GET /v1/, Single email validationFoundry, pay as you go
$ per 1,000 emails$1.00$1.00$1.00$1.00$1.00$1.00
Completeness33%50%67%33%50%50%
Billingpay as you gopay firstpay firstmonthlypay firstpay as you go
Payper call$200$20$100$200per call
Enough foras many as you pay for200,000 calls20,000 results100,000 calls a month200,000 callsas many as you pay for
Freshnessunknownunknownliveliveliveunknown
Who can get itanyone with a wallet paying each call in USDC through x402 on Base, with no account or API keyanyone 18 or older able to form a binding contractanyone at least 18 years old and legally able to enter into a contract, for their internal business purposes onlyanyone with a work emailanyone over 18anyone with a wallet paying each call in USDC on Base (x402), with no account or API key

Sources

From each provider's own pricing page and docs, and from what providers tell us. We read this row from these pages on 2026-11-10.

  1. fourzerotwo.si/apis/validators/email
  2. fourzerotwo.si/catalog.json
  3. fourzerotwo.si/credits
  4. fourzerotwo.si/free
  5. fourzerotwo.si/llms.txt
  6. fourzerotwo.si/openapi.json

Product details

The key fields this plan's answer can hold, then each filled column in its row on the sheet.

  • Address, not in the answer
  • Deliverability
  • Confidence, not in the answer
  • Name, not in the answer
  • Place, not in the answer
  • Company
Price
$ per 1,000 emails$0.00
Percall
Billingfree
Aggregators
Aggregatorsnone
Charges
Also pays forfrom the same budget: 529 other fourzerotwo calls: 500 a day
Not found
$ per 1,000 calls that find nothing$0.00
In their words
Their pitchEmail syntax, whether the domain accepts mail, disposable and role-account flags.
Data
What it checksformat, mail servers, disposable domains, role addresses
Keep datano API terms
Use dataKeep the attribution when you show the data.
Plan
Pay$0
Enough for15,000 calls a month
Rate limit
Per day500
Batch1
Speed
Answerin the call
The call
You sendemail
MethodGET
Path/v1/validators/email
About the plan
PlanFree key
Who can get itanyone with an email address
The 4 fields the plan's answer can hold

syntax valid, domain accepts mail, disposable, role account

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