# WhatsScale, free: Phone validation API

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

WhatsScale's Free plan for the phone validation API costs $0.00 per 1,000 phones. We check each provider's docs for 9 fields. WhatsScale's docs list 2: Number, Formats.
WhatsScale limits how many calls you get but gives no number.
We haven't run WhatsScale through [our phone validation API benchmark](https://datacircle.dev/best-phone-validation-api.txt) yet.
This plan is free. We rank 1,266 plans for phone validation APIs by price. Half the plans cost $3.55 or less per 1,000 phones. [See the best free phone validation API plan.](https://datacircle.dev/best-phone-validation-api.txt)
[GuGuData's CNY 124 (about $19) monthly plan](https://datacircle.dev/validate-phone-apis/gugudata/cny-124-monthly/llms.txt) is the cheapest paid plan per 1,000 phones. GuGuData's CNY 124 (about $19) monthly plan charges nothing per call. You get as many phones as GuGuData's rate limit allows. [Neutrino API's On-Demand plan](https://datacircle.dev/validate-phone-apis/neutrino-api/pay-as-you-go-on-demand/llms.txt) costs the least for 10,000 phones a month: $0.80.
[Trestle](https://datacircle.dev/validate-phone-apis/trestle/top-up-from-10-self-serve-pay-as-you-go-get-3-0-phone-intel-phone-validation-api/llms.txt), [Data247](https://datacircle.dev/validate-phone-apis/data247/12-pack-membership-get-v3-0-verify247-phone/llms.txt) and [Abstract API](https://datacircle.dev/validate-phone-apis/abstract-api/19-monthly-starter-5000-requests-month/llms.txt) are the best phone validation API providers in the Datacircle benchmark.

- This page: https://datacircle.dev/validate-phone-apis/whatsscale/free
- [Phone validation API: the best of 50+ providers compared](https://datacircle.dev/best-phone-validation-api.txt)
- Get it: https://whatsscale.com/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-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=phone-validation-api-pricing
- Its API docs: https://whatsscale.com/docs?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing#check-whatsapp
- Sold by: WhatsScale (https://whatsscale.com?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing)
- Checked: 2026-11-09

## In the answer

- Completeness: 22%
- Number: ✓
- Formats: ✓

## Price

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

## Aggregators

- Aggregators: none

## Charges

- Also pays for: Send Text Message

## Not found

- $ per 1,000: $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
- 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/validate-phone-apis/whatsscale/free/llms.txt): $0.00 per 1,000, 22% complete, live
- [WhatsScale, $5 monthly](https://datacircle.dev/validate-phone-apis/whatsscale/5-monthly/llms.txt): 22% complete, live
- [WhatsScale, $29 monthly](https://datacircle.dev/validate-phone-apis/whatsscale/29-monthly/llms.txt): 22% complete, live
- [WhatsScale, $299 yearly](https://datacircle.dev/validate-phone-apis/whatsscale/299-yearly/llms.txt): 22% complete, live
- [WhatsScale, contact us](https://datacircle.dev/validate-phone-apis/whatsscale/contact-us/llms.txt): 22% complete, live

## WhatsScale's calls (1)

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

## WhatsScale's APIs (1)

- [WhatsScale: phone validation API pricing, 5 plans](https://datacircle.dev/validate-phone-apis/whatsscale/free/llms.txt)

## WhatsScale: phone validation API alternatives

- [Foxentry, free trial, POST /phone/validate, Validate phone number (extended)](https://datacircle.dev/validate-phone-apis/foxentry/free-trial-post-phone-validate-validate-phone-number-extended/llms.txt): $0.00 per 1,000, 56% complete, live
- [HLR Lookups, free, 100 free lookups, POST /hlr-lookups](https://datacircle.dev/validate-phone-apis/hlr-lookups/free-100-free-lookups-post-hlr-lookups/llms.txt): $0.00 per 1,000, 56% complete, live
- [HLR Lookup, free, 200 free credits, POST /batches/{id}/sourcejson, Bulk uploads via API](https://datacircle.dev/validate-phone-apis/hlr-lookup/free-200-free-credits-post-batches-id-sourcejson/llms.txt): $0.00 per 1,000, 89% complete, live
- [seven.io, free test credit, GET /api/lookup/hlr](https://datacircle.dev/validate-phone-apis/seven-io/free-test-credit-get-api-lookup-hlr/llms.txt): $0.00 per 1,000, 78% 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=phone-validation-api-pricing
- https://whatsscale.com/docs?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- https://whatsscale.com/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- https://whatsscale.com/terms?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing