# WasenderAPI, free: WhatsApp number check API

> Verifies if a given phone number, WhatsApp JID, or username handle is registered on WhatsApp.

WasenderAPI's Trial plan for the WhatsApp number check API costs $0.00 per 1,000 phones. We check each provider's docs for 6 fields. WasenderAPI's docs list 1: On WhatsApp.
You get up to 3,000 calls a month.
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/wasenderapi/free
- Get it: https://wasenderapi.com/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=whatsapp-number-check-api-pricing
- Request: `GET https://www.wasenderapi.com/api/on-whatsapp/{contact_identifier}`
- API key: with the plan, on https://wasenderapi.com/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=whatsapp-number-check-api-pricing
- Its API docs: https://wasenderapi.com/api-docs/sessions/check-if-a-contact-is-on-whatsapp?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=whatsapp-number-check-api-pricing
- Sold by: WasenderAPI (https://wasenderapi.com?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=whatsapp-number-check-api-pricing)
- Checked: 2026-11-02

## In the answer

- Completeness: 17%
- On WhatsApp: ✓

## Price

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

## Charges

- Also pays for: 64 other WasenderAPI calls

## Not found

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

## In their words

- Their pitch: Verifies if a given phone number, WhatsApp JID, or username handle is registered on WhatsApp.

## Data

- Freshness: live
- What it checks: messaging apps
- Keep data: no limit
- Use data: API Terms: Customers may access their WasenderApi account data via an API (Application Program Interface). Any use of the API, including use of the API through a third-party product that accesses WasenderApi, is bound by these Terms of Service. [...] Abuse or excessively frequent requests to WasenderApi via the API may result in the temporary or permanent suspension of your account's access to the API. WasenderApi, in its sole discretion, will determine abuse or excessive usage of the API. Account Terms: You may not use the Service for any illegal or unauthorized purpose. You must not, in the use of the Service, violate any laws in your jurisdiction (including but not limited to copyright laws). WhatsApp Usage Compliance and Disclaimer: You agree to comply with WhatsApp's Terms of Service and Business Policy when using our Service to interact with the WhatsApp platform. [...] User Obligations and Consent: The customer is strictly prohibited from sending any message that falls under the following categories: Spam or bulk messages. Messages that may cause malfunction of the Developer's equipment. Messages sent via pornographic or other reprehensible messengers. Messages that mislead users, such as those sent from someone else's name or giving false information. Transmitting inaccurate or confidential information. Transfer of information that has been unlawfully obtained by the Customer and/or violates the copyrights or related rights of third parties. Advertising alcohol, tobacco, drugs, or other illegal means. Transmission of information that violates the norms of the current legislation or international law. You must not use the Service for any activity that violates applicable laws or third-party rights.

## Plan

- Pay: $0
- Enough for: 3,000 calls a month

## Rate limit

- Per day: 100
- Per second: 0.17 (10 a minute)
- Batch: 1

## Speed

- Answer: in the call

## The call

- You send: contact_identifier
- Method: GET
- Path: /api/on-whatsapp/{contact_identifier}

## About the plan

- Plan: Trial
- Who can get it: anyone 18 years or older with a WhatsApp number to link to a session by QR code, no credit card required

## The only field the plan's answer can hold

registered on WhatsApp

## WasenderAPI's plans (10)

- [WasenderAPI, free](https://datacircle.dev/check-whatsapp-apis/wasenderapi/free/llms.txt): $0.00 per 1,000, 17% complete, live
- [WasenderAPI, $6 monthly](https://datacircle.dev/check-whatsapp-apis/wasenderapi/6-monthly/llms.txt): $0.20 per 1,000, 17% complete, live
- [WasenderAPI, $15 monthly](https://datacircle.dev/check-whatsapp-apis/wasenderapi/15-monthly/llms.txt): $0.167 per 1,000, 17% complete, live
- [WasenderAPI, $30 monthly](https://datacircle.dev/check-whatsapp-apis/wasenderapi/30-monthly/llms.txt): $0.167 per 1,000, 17% complete, live
- [WasenderAPI, $45 monthly](https://datacircle.dev/check-whatsapp-apis/wasenderapi/45-monthly/llms.txt): $0.15 per 1,000, 17% complete, live
- [WasenderAPI, $61.20 yearly](https://datacircle.dev/check-whatsapp-apis/wasenderapi/61-20-yearly/llms.txt): $0.17 per 1,000, 17% complete, live
- [WasenderAPI, $153 yearly](https://datacircle.dev/check-whatsapp-apis/wasenderapi/153-yearly/llms.txt): $0.142 per 1,000, 17% complete, live
- [WasenderAPI, $306 yearly](https://datacircle.dev/check-whatsapp-apis/wasenderapi/306-yearly/llms.txt): $0.142 per 1,000, 17% complete, live
- [WasenderAPI, $459 yearly](https://datacircle.dev/check-whatsapp-apis/wasenderapi/459-yearly/llms.txt): $0.128 per 1,000, 17% complete, live
- [WasenderAPI, contact us](https://datacircle.dev/check-whatsapp-apis/wasenderapi/contact-us/llms.txt): 17% complete, live

## WasenderAPI's calls (1)

- `GET /api/on-whatsapp/{contact_identifier}`: [WasenderAPI, free](https://datacircle.dev/check-whatsapp-apis/wasenderapi/free/llms.txt)

## WasenderAPI's APIs (1)

- [WasenderAPI WhatsApp number check API pricing, 10 plans](https://datacircle.dev/check-whatsapp-apis/wasenderapi/free/llms.txt)

## WasenderAPI: WhatsApp number check API alternatives

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

We list WasenderAPI's cheapest paid plan first. Next we list other providers' plans closest to WasenderAPI in price per 1,000 phones. Each plan in the list gives live data.

- [WasenderAPI, $459 yearly](https://datacircle.dev/check-whatsapp-apis/wasenderapi/459-yearly/llms.txt): $0.128 per 1,000, 17% complete, live
- [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 Advanced](https://datacircle.dev/check-whatsapp-apis/checknumber-ai/top-up-from-20-pay-as-you-go-post-v1-tasks-whatsapp-advanced/llms.txt): $0.10 per 1,000, 0% 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
- [NumDetect, $499.90 pack, Scale, POST /api/v1/bulk-jobs, Bulk check, WhatsApp](https://datacircle.dev/check-whatsapp-apis/numdetect/499-90-pack-scale-post-api-v1-bulk-jobs-bulk-check-whatsapp/llms.txt): $0.208 per 1,000, 33% 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 2026-11-02.

- https://wasenderapi.com?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=whatsapp-number-check-api-pricing
- https://wasenderapi.com/api-docs/rate-limits/understanding-rate-limits?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=whatsapp-number-check-api-pricing
- https://wasenderapi.com/api-docs/sessions/check-if-a-contact-is-on-whatsapp?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=whatsapp-number-check-api-pricing
- https://wasenderapi.com/help/account-billing/free-trial-limits?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=whatsapp-number-check-api-pricing
- https://wasenderapi.com/help/account-billing/subscription-plans?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=whatsapp-number-check-api-pricing
- https://wasenderapi.com/llms.txt?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=whatsapp-number-check-api-pricing
- https://wasenderapi.com/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=whatsapp-number-check-api-pricing
- https://wasenderapi.com/terms?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=whatsapp-number-check-api-pricing