# UltraMsg, free: WhatsApp number check API

> It would be great to check if a specified phone number has WhatsApp or not to make the WhatsApp number filter.

UltraMsg's Free account 3 Days 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. UltraMsg's docs list none of the 6.
UltraMsg 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/ultramsg/free
- Get it: https://ultramsg.com/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=whatsapp-number-check-api-pricing#ultra_price
- Request: `GET https://api.ultramsg.com/{instance_id}/contacts/check`
- API key: with the plan, on https://ultramsg.com/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=whatsapp-number-check-api-pricing#ultra_price
- Its API docs: https://docs.ultramsg.com/api/get/contacts/check?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=whatsapp-number-check-api-pricing
- Sold by: UltraMsg (https://ultramsg.com?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=whatsapp-number-check-api-pricing)
- Checked: 2026-11-02

## In the answer

- Completeness: 0%

## Price

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

## Charges

- Also pays for: nothing else

## Not found

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

## In their words

- Their pitch: It would be great to check if a specified phone number has WhatsApp or not to make the WhatsApp number filter.

## Data

- Freshness: 3 days
- What it checks: messaging apps
- Keep data: no limit
- Use data: The client undertakes to obtain in advance from the user to whom the message is to be sent consent in any form, such as oral, written,Email.etc The customer is obligated not to send any message that falls under the following items : for Spam or bulk messages, for send messages that may cause malfunction of the Developer's equipment, for sending messages via pornographic or other reprehensible messengers, for sending messages via messengers that mislead users, such as those sent from someone else's name or giving false information, for transmitting inaccurate, confidential information, for transfer of information that has been unlawfully obtained by the Customer and/or violates the copyrights or related rights of third parties, for advertising alcohol, tobacco and drugs , or other illegal means, for transmission of information that violates the norms of the current legislation or international law

## Plan

- Pay: $0

## Rate limit

- Batch: 1

## Speed

- Answer: in the call

## The call

- You send: instance_id, chatId, nocache
- Method: GET
- Path: /{instance_id}/contacts/check

## About the plan

- Plan: Free account 3 Days
- Who can get it: anyone with a WhatsApp number to link to an instance by QR code

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

status

## UltraMsg's plans (3)

- [UltraMsg, free](https://datacircle.dev/check-whatsapp-apis/ultramsg/free/llms.txt): $0.00 per 1,000, 0% complete, 3 days
- [UltraMsg, $39 monthly](https://datacircle.dev/check-whatsapp-apis/ultramsg/39-monthly/llms.txt): 0% complete, 3 days
- [UltraMsg, $390 yearly](https://datacircle.dev/check-whatsapp-apis/ultramsg/390-yearly/llms.txt): 0% complete, 3 days

## UltraMsg's calls (1)

- `GET /{instance_id}/contacts/check`: [UltraMsg, free](https://datacircle.dev/check-whatsapp-apis/ultramsg/free/llms.txt)

## UltraMsg's APIs (1)

- [UltraMsg WhatsApp number check API pricing, 3 plans](https://datacircle.dev/check-whatsapp-apis/ultramsg/free/llms.txt)

## UltraMsg: WhatsApp number check API alternatives

[UltraMsg alternatives: other WhatsApp number check API providers by price](https://datacircle.dev/ultramsg-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 or data at most a week old.

- [Wappi, free trial, 5 days, GET /api/sync/contact/info](https://datacircle.dev/check-whatsapp-apis/wappi/free-trial-5-days-get-api-sync-contact-info/llms.txt): $0.00 per 1,000, 67% complete, live
- [WhatsMCP, free](https://datacircle.dev/check-whatsapp-apis/whatsmcp/free/llms.txt): $0.00 per 1,000, 67% complete, live
- [Wawp, free](https://datacircle.dev/check-whatsapp-apis/wawp/free/llms.txt): $0.00 per 1,000, 33% complete, live
- [WasenderAPI, free](https://datacircle.dev/check-whatsapp-apis/wasenderapi/free/llms.txt): $0.00 per 1,000, 17% 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://blog.ultramsg.com/check-whatsapp-numbers-using-api-whatsapp-filter/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=whatsapp-number-check-api-pricing
- https://docs.ultramsg.com?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=whatsapp-number-check-api-pricing
- https://docs.ultramsg.com/api/get/contacts/check?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=whatsapp-number-check-api-pricing
- https://ultramsg.com?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=whatsapp-number-check-api-pricing
- https://ultramsg.com/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=whatsapp-number-check-api-pricing#ultra_price
- https://ultramsg.com/terms-conditions.php?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=whatsapp-number-check-api-pricing