# UltraMsg, free: Phone validation API

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

UltraMsg's phone validation API on its Free account 3 Days plan. It costs $0.00 per 1,000 phones. It returns 1 of the 9 key fields we check: Validity.
UltraMsg limits how many calls you get but gives no number.
We haven't run UltraMsg through [our phone validation API benchmark](https://datacircle.dev/best-phone-validation-api.txt) yet.
This plan is free. We rank 888 plans for phone validation APIs by price. Half the plans cost $3.376 per 1,000 phones or less.
[Botoi's $199 monthly plan](https://datacircle.dev/validate-phone-apis/botoi/199-monthly/llms.txt) is the cheapest paid plan per 1,000 phones: as little as $0.0066. Botoi's $199 monthly plan covers up to 1,000,000 phones a day.
[Data247](https://datacircle.dev/validate-phone-apis/data247/12-pack-membership-get-v3-0-verify247-phone/llms.txt), [Foxentry](https://datacircle.dev/validate-phone-apis/foxentry/top-up-pay-as-you-go-post-phone-validate-validate-phone-number-extended/llms.txt) and [HLR Lookups](https://datacircle.dev/validate-phone-apis/hlr-lookups/top-up-1-1m-post-hlr-lookup/llms.txt) are the best phone validation API providers in the Datacircle benchmark.

- This page: https://datacircle.dev/validate-phone-apis/ultramsg/free
- [Phone validation API: 40+ providers compared](https://datacircle.dev/best-phone-validation-api.txt)
- Get it: https://ultramsg.com/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-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=phone-validation-api-pricing#ultra_price
- Its API docs: https://docs.ultramsg.com/api/get/contacts/check?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- Sold by: UltraMsg (https://ultramsg.com?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing)
- Checked: 2026-11-02

## In the answer

- Completeness: 11%
- Validity: ✓

## Price

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

## Aggregators

- Aggregators: none

## Charges

- Also pays for: nothing else

## Not found

- $ per 1,000: $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/validate-phone-apis/ultramsg/free/llms.txt): $0.00 per 1,000, 11% complete, 3 days
- [UltraMsg, $39 monthly](https://datacircle.dev/validate-phone-apis/ultramsg/39-monthly/llms.txt): 11% complete, 3 days
- [UltraMsg, $390 yearly](https://datacircle.dev/validate-phone-apis/ultramsg/390-yearly/llms.txt): 11% complete, 3 days

## UltraMsg's calls (1)

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

## UltraMsg's APIs (1)

- [UltraMsg: phone validation API pricing, 3 plans](https://datacircle.dev/validate-phone-apis/ultramsg/free/llms.txt)

## UltraMsg: 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
- [Abstract API, free](https://datacircle.dev/validate-phone-apis/abstract-api/free/llms.txt): $0.00 per 1,000, 89% complete, 1 day
- [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 2026-11-02.

- https://blog.ultramsg.com/check-whatsapp-numbers-using-api-whatsapp-filter/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- https://docs.ultramsg.com?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- https://docs.ultramsg.com/api/get/contacts/check?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- https://ultramsg.com?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- https://ultramsg.com/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing#ultra_price
- https://ultramsg.com/terms-conditions.php?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing