Datacircle

RelentlessIdentity pricing: email verification API, POST /client/probe

RelentlessIdentity's siteThis page as plain textEmail validation API: 200+ verification providers comparedRelentlessIdentity: email verification API alternatives

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33% complete: 2 of the 6 key fields we checkSee the 6 fields
$0.00per 1,000 emailsWe haven't run RelentlessIdentity through our email verification API benchmark yet.This plan is free. We rank 3,952 plans for email verification APIs by price. Half the plans cost $1.999 per 1,000 emails or less.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.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.pingutil, MailTester Ninja and Giggal are the best email verification API providers in the Datacircle benchmark.
Type a number to see the cheapest RelentlessIdentity plan for that many emails. The table below then sorts the other plans by what each costs.
Plan: Free one of RelentlessIdentity's 23 plans
Call: POST /client/probe one of RelentlessIdentity's 3 calls for this API
API: Email verification API one of RelentlessIdentity's 2 APIs

About this item

  • Live. RelentlessIdentity checks the email when you call the API.
  • 2 of the 6 key fields we check. Address, Deliverability.
  • Nothing to pay.
  • One call. You send email to POST /client/probe. The call returns whether the address takes mail.
  • Who can get it: anyone 16 or older, for lawful professional and business purposes. Keep data: no limit. Use data: with conditions.

RelentlessIdentity: email verification API alternatives

RelentlessIdentity alternatives: other email verification API providers by price

The table starts with RelentlessIdentity's cheapest paid plan. Next come plans from other providers with the price per 1,000 emails closest to RelentlessIdentity's. Each plan in the table gives live data.

RelentlessIdentity, $11,988 yearly, $11,988 Annual, POST /client/probeGetProspect, $29 pack, 10,000 verifications, POST /v2/email-verificationsBounceless, $29 pack, 10,000 credit pack, POST /v1/requests, Create a batch (emails)WhoisXML API, $1,740 yearly, Yearly subscription 50,000 Queries, GET /api/v3MailTester, $29 pack
$ per 1,000 emails$2.896$2.90$2.90$2.90$2.90
Completeness33%50%50%50%50%
Billingyearlypay firstpay firstyearlypay first
Pay$11,988$29$29$1,740$29
Enough for4,139,502 calls a year10,000 results10,000 results50,000 calls a month10,000 calls
Freshnesslivelivelivelivelive
Who can get itanyone 16 or older, for lawful professional and business purposesanyone 16 or overbusiness customers outside the European Economic Area and the UKanyone, for internal business purposesanyone

Sources

From each provider's own pricing page and docs, and from what providers tell us. We read this row from these pages on 2026-11-05.

  1. relentlessidentity.com/
  2. relentlessidentity.com/acceptable-use
  3. relentlessidentity.com/api/reference/spec
  4. relentlessidentity.com/docs/catch-all-verification
  5. relentlessidentity.com/docs/crypto-payments
  6. relentlessidentity.com/docs/response-semantics
  7. relentlessidentity.com/docs/rest-api-reference
  8. relentlessidentity.com/llms.txt
  9. relentlessidentity.com/pricing
  10. relentlessidentity.com/privacy
  11. relentlessidentity.com/terms

Product details

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

  • Address
  • Deliverability
  • Confidence, not in the answer
  • Name, not in the answer
  • Place, not in the answer
  • Company, not in the answer
Price
$ per 1,000 emails$0.00
Percall
Billingfree
Aggregators
Aggregatorsnone
Charges
Also pays forfrom the same budget: Find a work email · Schedule a finder batch · Verify many email addresses · Schedule a probe batch
Not found
$ per 1,000$0.00
Catch-all
$ per 1,000$0.00
In their words
Their pitchUse Probe when you already know the exact email address and want a compact deliverability verdict.
Data
Freshnesslive
What it checksmail servers, mailbox
Keep datano limit
Use dataYou may use the service only for lawful professional and business purposes, including sales and marketing validation, SaaS data hygiene, recruiting, fraud prevention, underwriting, and account verification. You agree not to: Use the service for spam, scams, or harassment, Discover or disclose consumer personal email addresses, Attempt credential attacks, phishing, or account takeover, Interfere with or disrupt the service, Introduce viruses, malware, or harmful code, Use the service to facilitate illegal activity, Violate the rights of others or evade privacy preferences
Plan
Pay$0
Rate limit
Batch1
Speed
Answerin the call
The call
You sendemail
MethodPOST
Path/client/probe
About the plan
PlanFree
Who can get itanyone 16 or older, for lawful professional and business purposes
The 10 fields the plan's answer can hold

state, outcome, email address, is alias, alias original, alias resolved, catch-all, identity providers, MX hosts, request ID

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