# ZelNum, free: WhatsApp number check API

> Verify WhatsApp availability and list quality at API speed without sending messages to the checked numbers.

ZelNum's Free test plan for the WhatsApp number check API costs $0.00 per 1,000 phones. We check each provider's docs for 6 fields: On WhatsApp, Business account, WhatsApp profile, WhatsApp ID and 2 more. ZelNum's docs list none of the 6.
ZelNum limits how many results you get but gives no number.
We haven't run a WhatsApp number check API benchmark yet.
This plan is free. We rank 99 plans for WhatsApp number check APIs by price. Half the plans cost $3.20 or less per 1,000 phones.
[ZelNum's $500 pack](https://datacircle.dev/check-whatsapp-apis/zelnum/500-pack-pay-as-you-go-500-top-up-post-detect/llms.txt) costs the least per 1,000 phones: $0.043. [Wawp's €39 yearly plan](https://datacircle.dev/check-whatsapp-apis/wawp/39-yearly/llms.txt) costs the least for 10,000 phones a month: about $3.66.

- This page: https://datacircle.dev/check-whatsapp-apis/zelnum/free
- Get it: https://zelnum.com/whatsapp-api/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=whatsapp-number-check-api-pricing
- Request: `POST https://api.zelnum.com/api/v1/detect`
- API key: with the plan, on https://zelnum.com/whatsapp-api/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=whatsapp-number-check-api-pricing
- Its API docs: https://zelnum.com/whatsapp-api/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=whatsapp-number-check-api-pricing
- Sold by: ZelNum (https://zelnum.com?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=whatsapp-number-check-api-pricing)
- Checked: 2026-10-28

## In the answer

- Completeness: 0%

## Price

- $ per 1,000 phones: $0.00
- Per: result
- Billing: free

## Charges

- Also pays for: from the same budget: 57 other ZelNum calls

## Not found

- $ per 1,000 calls that find nothing: $0.00

## In their words

- Their pitch: Verify WhatsApp availability and list quality at API speed without sending messages to the checked numbers.

## Data

- What it checks: messaging apps
- Keep data: no limit
- Use data: ZelNum is provided for the following purposes only: CRM list cleaning and contact record quality checks. Marketing list hygiene: suppressing invalid, duplicate, unreachable, or wrong-channel records inside lists you are already allowed to process. Fraud, abuse, and risk review of signup, lead, or applicant records. Internal data-quality and compliance support for records you hold a lawful basis to process. Developer integration of validation into your own product through the API. [...] You must not use ZelNum to: Send, or prepare to send, unsolicited messages, spam, or bulk cold outreach of any kind. Harass, threaten, stalk, embarrass, or harm any person, or to find people who do not want to be found. Check numbers or identifiers for which you do not hold a lawful basis and any required consent. Build, resell, or distribute a database of people, or of their platform memberships, as a data broker. Circumvent platform rules, rate limits, or access controls, or resell raw access to the service. Impersonate ZelNum, present results as identity proof, or generate reports that claim identity or consent has been verified. Break any law that applies to you, including data-protection and anti-spam rules such as the GDPR, the ePrivacy Directive, or local equivalents. Access or use the service from, or on behalf of persons or entities in, jurisdictions subject to comprehensive sanctions, or in violation of applicable export-control rules. [...] You must not use ZelNum, or allow anything built on ZelNum to be used, for any of the following: Resale and redistribution of results. Passing ZelNum output to another party as a product, dataset, or service — whether resold, sublicensed, white-labelled, bundled into your own offering, or exposed through an API, dashboard, or file that third parties can query. Using results inside your own business, and inside software you operate for your own customers on their own records, is permitted, trading the output itself is not. Eligibility decisions about people. Using results as a factor in employment, credit, insurance, tenancy, education, or benefits decisions, or as identity verification or a background check. [...] By submitting a phone number, email address, or other identifier, you confirm that you hold a lawful basis for processing it and that you have obtained any consent or permission required by law or by the relevant platform.

## Plan

- Pay: $0

## Rate limit

- Per second: 0.17 (10 a minute)
- Batch: 1,000 to 2,000,000

## Speed

- Answer: by polling

## The call

- You send: product "waValid", country, phones
- Method: POST
- Path: /detect

## About the plan

- Plan: Free test
- Who can get it: anyone

## The 10 fields the plan's answer can hold

result, checked at, billing status, valid count, invalid count, unknown count, submitted count, total count, cost deducted, cost refunded

## ZelNum's plans (6)

- [ZelNum, free](https://datacircle.dev/check-whatsapp-apis/zelnum/free/llms.txt): $0.00 per 1,000, 0% complete
- [ZelNum, $100 pack, Pay as you go, $100 top-up, POST /detect](https://datacircle.dev/check-whatsapp-apis/zelnum/100-pack-pay-as-you-go-100-top-up-post-detect/llms.txt): $0.048 per 1,000, 0% complete
- [ZelNum, $200 pack, Pay as you go, $200 top-up, POST /detect](https://datacircle.dev/check-whatsapp-apis/zelnum/200-pack-pay-as-you-go-200-top-up-post-detect/llms.txt): $0.045 per 1,000, 0% complete
- [ZelNum, $500 pack, Pay as you go, $500 top-up, POST /detect](https://datacircle.dev/check-whatsapp-apis/zelnum/500-pack-pay-as-you-go-500-top-up-post-detect/llms.txt): $0.043 per 1,000, 0% complete
- [ZelNum, $1,000 pack, Pay as you go, $1,000 top-up, POST /detect](https://datacircle.dev/check-whatsapp-apis/zelnum/1000-pack-pay-as-you-go-1000-top-up-post-detect/llms.txt): $0.042 per 1,000, 0% complete
- [ZelNum, $2,000 pack, Pay as you go, $2,000 top-up, POST /detect](https://datacircle.dev/check-whatsapp-apis/zelnum/2000-pack-pay-as-you-go-2000-top-up-post-detect/llms.txt): $0.04 per 1,000, 0% complete

## ZelNum's calls for this API (3)

- `POST /detect`: [ZelNum, free](https://datacircle.dev/check-whatsapp-apis/zelnum/free/llms.txt)
- `POST /detect/file`: [ZelNum, $100 pack, Pay as you go, $100 top-up, POST /detect/file](https://datacircle.dev/check-whatsapp-apis/zelnum/100-pack-pay-as-you-go-100-top-up-post-detect-file/llms.txt)
- `POST /realtime/check/{series}`: [ZelNum, $100 pack, Pay as you go, $100 top-up, POST /realtime/check/{series}](https://datacircle.dev/check-whatsapp-apis/zelnum/100-pack-pay-as-you-go-100-top-up-post-realtime-check-series/llms.txt)

## ZelNum's APIs (2)

- [ZelNum WhatsApp number check API pricing, 6 plans](https://datacircle.dev/check-whatsapp-apis/zelnum/free/llms.txt)
- [ZelNum Phone validation API pricing, 6 plans, POST /detect, Phone Status Check](https://datacircle.dev/validate-phone-apis/zelnum/free-test-post-detect-phone-status-check/llms.txt)
- [ZelNum Phone validation API pricing, 6 plans, POST /detect, Telegram Number Checker](https://datacircle.dev/validate-phone-apis/zelnum/free-test-post-detect-telegram-number-checker/llms.txt)

## ZelNum: WhatsApp number check API alternatives

[ZelNum alternatives: other WhatsApp number check API providers by price](https://datacircle.dev/zelnum-alternatives.txt)

We list ZelNum's cheapest paid plan first. Next we list other providers' plans closest to ZelNum in price per 1,000 phones.

- [ZelNum, $2,000 pack, Pay as you go, $2,000 top-up, POST /detect](https://datacircle.dev/check-whatsapp-apis/zelnum/2000-pack-pay-as-you-go-2000-top-up-post-detect/llms.txt): $0.04 per 1,000, 0% complete
- [Wawp, €50 monthly](https://datacircle.dev/check-whatsapp-apis/wawp/50-monthly/llms.txt): $0.00026 per 1,000, 33% complete, live
- [CheckNumber.AI, top-up from $20, Pay as you go, POST /v1/tasks, WhatsApp Checker](https://datacircle.dev/check-whatsapp-apis/checknumber-ai/top-up-from-20-pay-as-you-go-post-v1-tasks-whatsapp-checker/llms.txt): $0.08 per 1,000, 0% complete, live
- [WasenderAPI, $459 yearly](https://datacircle.dev/check-whatsapp-apis/wasenderapi/459-yearly/llms.txt): $0.128 per 1,000, 17% complete, live
- [2Chat, $100 pack, Extra requests package, GET /open/whatsapp/check-number/{your-number}/{number-to-check}, Check Number](https://datacircle.dev/check-whatsapp-apis/2chat/100-pack-extra-requests-package-get-open-whatsapp-check-number-your-number-number-to-check-check-number/llms.txt): $0.20 per 1,000, 83% complete, live

## 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.

- https://api.zelnum.com/api/v1/products?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=whatsapp-number-check-api-pricing
- https://app.zelnum.com/docs/en?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=whatsapp-number-check-api-pricing
- https://zelnum.com/acceptable-use?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=whatsapp-number-check-api-pricing
- https://zelnum.com/openapi.yaml?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=whatsapp-number-check-api-pricing
- https://zelnum.com/phone-validation-api?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=whatsapp-number-check-api-pricing
- https://zelnum.com/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=whatsapp-number-check-api-pricing
- https://zelnum.com/terms?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=whatsapp-number-check-api-pricing
- https://zelnum.com/whatsapp-api?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=whatsapp-number-check-api-pricing