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

CheckNumber.AI's site llms.txt Best 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, WhatsApp 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

Live. The provider checks the number when you call.
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 "ws". 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. Each plan in the table gives live data.

	CheckNumber.AI, top-up from $20, Pay as you go, POST /v1/tasks, WhatsApp Checker	Antideo, $50 monthly, 1000 requests/hour, GET /phone/{country code}/{phone number}	ZelNum, $2,000 pack, Pay as you go, $2,000 top-up, POST /detect, HLR Lookup	Phone-Check.app, $79.99 monthly, Business, GET /v1-get-phone-extra-details	CallerAPI, $25,000 monthly, Enterprise transparency $25,000, GET /api/network-lookup/{phone}
$ per 1,000 phones	$0.08	$0.069	$0.32	$0.552	$0.714
Completeness	11%	67%	33%	78%	44%
Billing	pay first	monthly	pay first	monthly	monthly
Pay	$20	$50	$2,000	$79.99	$25,000
Enough for	as many as you pay for	720,000 calls a month	6,250,000 results	145,000 calls a month	35,000,000 calls a month
Freshness	live	live	live	live	live
Who can get it	anyone	anyone	anyone	anyone	anyone who agrees terms with CallerAPI sales ("Exact terms are set in your agreement")

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.

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
Per	result
Billing	free

Aggregators
Aggregators	none

Not found
$ per 1,000	$0.00

In their words
Their pitch	Check whether phone numbers are registered on WhatsApp and return a yes/no registration result for each number.

Data
Freshness	live
Countries	Worldwide
What it checks	messaging apps
Keep data	no 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 get	1,000 results
Enough for	1,000 results, once

Rate limit
Batch	1,000,000

Speed
Answer	by polling

The call
You send	file, task_type "ws"
Method	POST
Path	/v1/tasks

About the plan
Plan	Free trial
Who can get it	anyone who contacts support

The 2 fields the plan's answer can hold

phone number, activated