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CheckNumber.AI pricing and alternatives: phone validation API, POST /v1/tasks, Viber Checker

CheckNumber.AI's sitellms.txtBest phone validation API in 2026

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11% complete: 1 of the 9 key fields we checkSee the 9 fields
$0.00per 1,000 phonesWe rank 614 plans by price. Botoi's $199 monthly plan is the cheapest paid plan per 1,000 phones: as little as $0.0066. Botoi's $199 monthly plan covers up to 1,000,000 phones a day.Data247, Abstract API and Listar are the best phone validation API providers in our benchmark.
Plan: Free trial one of CheckNumber.AI's 3 plans
Call: POST /v1/tasks, Viber Checker one of CheckNumber.AI's 27 calls for this API
API: Phone validation API one of CheckNumber.AI's 2 APIs

About this item

  • Freshness. We don't know how fresh this plan's data is.
  • 1 of the 9 key fields we check. Number.
  • Nothing to pay. You get 1,000 results once.
  • One call. You send file to POST /v1/tasks. You set task_type to "viber". The call returns a job. You fetch the answer once the job is done.
  • Who can get it: anyone who contacts support. Keep data: no limit. Use data: with conditions.

CheckNumber.AI: phone validation API alternatives

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

CheckNumber.AI, top-up from $20, Pay as you go, POST /v1/tasks, Viber CheckerReefAPI, $15 monthly, Pro monthly, POST /phone-validate/v1/batchNeutrino API, $10 monthlyZelNum, $100 pack, Pay as you go, $100 top-up, POST /detect/file, WhatsApp Number Checker (file upload)Antideo, $80 monthly, 2000 requests/hour, GET /phone/{phone number}
$ per 1,000 phones$0.05$0.03$0.033$0.048$0.056
Completeness11%67%67%11%67%
Billingpay firstmonthlymonthlypay firstmonthly
Pay$20$15$10$100$80
Enough foras many as you pay for500,000 results a month10,000 calls a day2,100,000 results1,440,000 calls a month
Freshnessunknownstoredstoredunknownlive
Who can get itanyoneanyoneanyoneanyoneanyone

Every phone validation API provider we score, ranked

Sources

From each provider's own pricing page and docs, and from what providers tell us. We read this row from these pages on 2026-10-28.

  1. checknumber.ai/llms.txt
  2. checknumber.ai/pricing
  3. checknumber.ai/terms
  4. docs.checknumber.ai
  5. docs.checknumber.ai/viber-bulk-number-checker/

Product details

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

  • Number
  • Formats, not in the answer
  • Validity, not in the answer
  • Type, not in the answer
  • Carrier, not in the answer
  • Porting and roaming, not in the answer
  • Place, not in the answer
  • Risk, not in the answer
  • Owner, not in the answer
Price
$ per 1,000 phones$0.00
Perresult
Billingfree
Aggregators
Aggregatorsnone
Not found
$ per 1,000$0.00
In their words
Their pitchCheck whether phone numbers are registered on Viber and return a yes/no registration result for each submitted number.
Data
CountriesWorldwide
What it checksmessaging apps
Keep datano limit
Use data"This license is granted solely for Your internal business purposes" (3.1), "You agree not to (a) license, sublicense, sell, resell, transfer, assign, distribute, or otherwise commercially exploit or make available to any third party the Service in any way, except as expressly permitted by these Terms or an Agreement, (b) modify or make derivative works based upon the Service, (c) reverse engineer, decompile, or disassemble the Service or attempt to gain unauthorized access to the Service or its related systems or networks, or (d) use the Service for any purpose or in any manner that is unlawful (including in violation of the PDPA) or prohibited by these Terms. Furthermore, You agree that any phone numbers or associated data obtained through the Service shall not be used by You or any third party acting on Your behalf to: (i) contact any individual without their prior, express, and informed consent for such contact, in accordance with PDPA requirements, (ii) send unsolicited commercial communications (spam), bulk messages, or any messages in violation of applicable anti-spam laws (including the Singapore Spam Control Act) and the PDPA, (iii) send harassing, abusive, threatening, defamatory, obscene, or otherwise unlawful communications, or (iv) engage in any other practices that violate the privacy or data protection rights of individuals or any applicable laws or regulations, including the PDPA" (3.2)
Plan
Pay$0
You get1,000 results
Enough for1,000 results, once
Rate limit
Batch1,000,000
Speed
Answerby polling
The call
You sendfile, task_type "viber"
MethodPOST
Path/v1/tasks
About the plan
PlanFree trial
Who can get itanyone who contacts support
The 2 fields the plan's answer can hold

phone number, activated

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