# WhatsScale, free: WhatsApp number check API

> Check if a phone number is registered on WhatsApp before sending.

WhatsScale's Free plan for the WhatsApp number check API costs $0.00 per 1,000 phones. We check each provider's docs for 6 fields. WhatsScale's docs list 3: On WhatsApp, WhatsApp ID, Formats.
WhatsScale limits how many calls 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/whatsscale/free
- Get it: https://whatsscale.com/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=whatsapp-number-check-api-pricing
- Request: `POST https://proxy.whatsscale.com/api/checkWhatsapp`
- API key: with the plan, on https://whatsscale.com/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=whatsapp-number-check-api-pricing
- Its API docs: https://whatsscale.com/docs?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=whatsapp-number-check-api-pricing#check-whatsapp
- Sold by: WhatsScale (https://whatsscale.com?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=whatsapp-number-check-api-pricing)
- Checked: 2026-11-09

## In the answer

- Completeness: 50%
- On WhatsApp: ✓
- WhatsApp ID: ✓
- Formats: ✓

## Price

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

## Charges

- Also pays for: Send Text Message

## Not found

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

## In their words

- Their pitch: Check if a phone number is registered on WhatsApp before sending.

## Data

- Freshness: live
- What it checks: messaging apps
- Keep data: no limit
- Use data: You agree to use WhatsScale in compliance with all applicable laws and regulations. You must NOT use WhatsScale to: Send spam, unsolicited messages, or bulk promotional content. Harass, threaten, or abuse any individual or group. Distribute malware, phishing attempts, or fraudulent content. Send illegal content or promote illegal activities. Impersonate others or misrepresent your identity. Violate intellectual property rights of others. Collect personal data without proper consent. Interfere with or disrupt the service. Attempt to bypass security measures or rate limits. Important: You must comply with WhatsApp Terms of Service at all times. You are solely responsible for obtaining proper consent from recipients before sending them messages. When using the WhatsScale API, you agree to: Keep your API key confidential and secure. Not share your API key with unauthorized parties. Use the API in accordance with our documentation. Respect rate limits and fair usage guidelines. Regenerate your API key immediately if compromised.

## Plan

- Pay: $0

## Rate limit

- Per second: 1.67 (100 a minute)
- Batch: 1

## Speed

- Answer: in the call

## The call

- You send: Content-Type header "application/json", session, phone
- Method: POST
- Path: /api/checkWhatsapp

## About the plan

- Plan: Free
- Who can get it: anyone aged 18 or over with a WhatsApp account on a phone they own or control

## The 4 fields the plan's answer can hold

registered on WhatsApp, phone number, formatted phone number, JID

## WhatsScale's plans (5)

- [WhatsScale, free](https://datacircle.dev/check-whatsapp-apis/whatsscale/free/llms.txt): $0.00 per 1,000, 50% complete, live
- [WhatsScale, $5 monthly](https://datacircle.dev/check-whatsapp-apis/whatsscale/5-monthly/llms.txt): 50% complete, live
- [WhatsScale, $29 monthly](https://datacircle.dev/check-whatsapp-apis/whatsscale/29-monthly/llms.txt): 50% complete, live
- [WhatsScale, $299 yearly](https://datacircle.dev/check-whatsapp-apis/whatsscale/299-yearly/llms.txt): 50% complete, live
- [WhatsScale, contact us](https://datacircle.dev/check-whatsapp-apis/whatsscale/contact-us/llms.txt): 50% complete, live

## WhatsScale's calls (1)

- `POST /api/checkWhatsapp`: [WhatsScale, free](https://datacircle.dev/check-whatsapp-apis/whatsscale/free/llms.txt)

## WhatsScale's APIs (1)

- [WhatsScale WhatsApp number check API pricing, 5 plans](https://datacircle.dev/check-whatsapp-apis/whatsscale/free/llms.txt)

## WhatsScale: WhatsApp number check API alternatives

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

We list other providers' plans closest to this plan in price per 1,000 phones. Each plan in the list gives live data.

- [2Chat, free trial, GET /open/whatsapp/check-number/{your-number}/{number-to-check}, Check Number](https://datacircle.dev/check-whatsapp-apis/2chat/free-trial-get-open-whatsapp-check-number-your-number-number-to-check-check-number/llms.txt): $0.00 per 1,000, 83% complete, live
- [WSAPI, free trial, POST /users/check](https://datacircle.dev/check-whatsapp-apis/wsapi/free-trial-post-users-check/llms.txt): $0.00 per 1,000, 33% complete, live
- [Credify, free](https://datacircle.dev/check-whatsapp-apis/credify/free/llms.txt): $0.00 per 1,000, 17% complete, live
- [CheckNumber.AI, free trial, POST /v1/tasks, WhatsApp Advanced](https://datacircle.dev/check-whatsapp-apis/checknumber-ai/free-trial-post-v1-tasks-whatsapp-advanced/llms.txt): $0.00 per 1,000, 0% 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 2026-11-09.

- https://whatsscale.com/api-docs?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=whatsapp-number-check-api-pricing
- https://whatsscale.com/docs?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=whatsapp-number-check-api-pricing
- https://whatsscale.com/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=whatsapp-number-check-api-pricing
- https://whatsscale.com/terms?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=whatsapp-number-check-api-pricing