# Z-API, free trial, 2 days, POST /instances/{instanceId}/token/{token}/phone-exists-batch: WhatsApp number check API

> Use this API whenever you want to check if a number has an application account, usually for form validation.

Z-API's "Free trial, 2 days" plan for the WhatsApp number check API costs $0.00 per 1,000 phones. We check each provider's docs for 6 fields. Z-API's docs list 2: WhatsApp ID, Formats.
Z-API limits how many results 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/z-api/free-trial-2-days-post-instances-instanceid-token-token-phone-exists-batch
- Get it: https://www.z-api.io/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=whatsapp-number-check-api-pricing
- Request: `POST https://api.z-api.io/instances/{instanceId}/token/{token}/phone-exists-batch`
- API key: with the plan, on https://www.z-api.io/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=whatsapp-number-check-api-pricing
- Its API docs: https://developer.z-api.io/en/contacts/get-iswhatsapp-batch?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=whatsapp-number-check-api-pricing
- Sold by: Z-API (https://z-api.io?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=whatsapp-number-check-api-pricing)
- Checked: 2026-11-02

## In the answer

- Completeness: 33%
- WhatsApp ID: ✓
- Formats: ✓

## Price

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

## Charges

- Also pays for: 217 other Z-API calls

## Not found

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

## In their words

- Their pitch: Use this API whenever you want to check if a number has an application account, usually for form validation.

## Data

- What it checks: messaging apps
- Keep data: no API terms
- Use data: Our REST API and Webhooks infrastructure is intended exclusively for technical interoperability between business systems (ERPs, CRMs and requested transactional notifications). Using it for bulk messaging, unsolicited communications (SPAM) or violating third-party terms of use is strictly prohibited and results in immediate account termination.

## Plan

- Pay: $0

## Rate limit

- Batch: 50,000

## Speed

- Answer: in the call

## The call

- You send: instanceId, phones
- Method: POST
- Path: /instances/{instanceId}/token/{token}/phone-exists-batch

## About the plan

- Plan: Free trial, 2 days
- Who can get it: anyone, no credit card

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

input, status, formatted number, WhatsApp LID

## Z-API's plans (19)

- [Z-API, free trial, 2 days, POST /instances/{instanceId}/token/{token}/phone-exists-batch](https://datacircle.dev/check-whatsapp-apis/z-api/free-trial-2-days-post-instances-instanceid-token-token-phone-exists-batch/llms.txt): $0.00 per 1,000, 33% complete
- [Z-API, $19.99 monthly, Ultimate Plan, POST /instances/{instanceId}/token/{token}/phone-exists-batch](https://datacircle.dev/check-whatsapp-apis/z-api/19-99-monthly-ultimate-plan-post-instances-instanceid-token-token-phone-exists-batch/llms.txt): no limit, 33% complete
- [Z-API, R$99.99 monthly, Plano Ultimate, POST /instances/{instanceId}/token/{token}/phone-exists-batch](https://datacircle.dev/check-whatsapp-apis/z-api/r-99-99-monthly-plano-ultimate-post-instances-instanceid-token-token-phone-exists-batch/llms.txt): no limit, 33% complete
- [Z-API, $179.90 monthly, Partner Plan, 10 to 49 instances, POST /instances/{instanceId}/token/{token}/phone-exists-batch](https://datacircle.dev/check-whatsapp-apis/z-api/179-90-monthly-partner-plan-10-to-49-instances-post-instances-instanceid-token-token-phone-exists-batch/llms.txt): no limit, 33% complete
- [Z-API, $799.50 monthly, Partner Plan, 50 to 99 instances, POST /instances/{instanceId}/token/{token}/phone-exists-batch](https://datacircle.dev/check-whatsapp-apis/z-api/799-50-monthly-partner-plan-50-to-99-instances-post-instances-instanceid-token-token-phone-exists-batch/llms.txt): no limit, 33% complete
- [Z-API, R$899.90 monthly, Plano Partner, 10 a 49 instâncias, POST /instances/{instanceId}/token/{token}/phone-exists-batch](https://datacircle.dev/check-whatsapp-apis/z-api/r-899-90-monthly-plano-partner-10-a-49-instancias-post-instances-instanceid-token-token-phone-exists-batch/llms.txt): no limit, 33% complete
- [Z-API, $1,499 monthly, Partner Plan, 100 to 199 instances, POST /instances/{instanceId}/token/{token}/phone-exists-batch](https://datacircle.dev/check-whatsapp-apis/z-api/1499-monthly-partner-plan-100-to-199-instances-post-instances-instanceid-token-token-phone-exists-batch/llms.txt): no limit, 33% complete
- [Z-API, $2,798 monthly, Partner Plan, 200 to 499 instances, POST /instances/{instanceId}/token/{token}/phone-exists-batch](https://datacircle.dev/check-whatsapp-apis/z-api/2798-monthly-partner-plan-200-to-499-instances-post-instances-instanceid-token-token-phone-exists-batch/llms.txt): no limit, 33% complete
- [Z-API, R$3,999.50 monthly, Plano Partner, 50 a 99 instâncias, POST /instances/{instanceId}/token/{token}/phone-exists-batch](https://datacircle.dev/check-whatsapp-apis/z-api/r-3999-50-monthly-plano-partner-50-a-99-instancias-post-instances-instanceid-token-token-phone-exists-batch/llms.txt): no limit, 33% complete
- [Z-API, $6,495 monthly, Partner Plan, 500 to 999 instances, POST /instances/{instanceId}/token/{token}/phone-exists-batch](https://datacircle.dev/check-whatsapp-apis/z-api/6495-monthly-partner-plan-500-to-999-instances-post-instances-instanceid-token-token-phone-exists-batch/llms.txt): no limit, 33% complete
- [Z-API, R$7,499 monthly, Plano Partner, 100 a 199 instâncias, POST /instances/{instanceId}/token/{token}/phone-exists-batch](https://datacircle.dev/check-whatsapp-apis/z-api/r-7499-monthly-plano-partner-100-a-199-instancias-post-instances-instanceid-token-token-phone-exists-batch/llms.txt): no limit, 33% complete
- [Z-API, $11,990 monthly, Partner Plan, 1,000 to 1,999 instances, POST /instances/{instanceId}/token/{token}/phone-exists-batch](https://datacircle.dev/check-whatsapp-apis/z-api/11990-monthly-partner-plan-1000-to-1999-instances-post-instances-instanceid-token-token-phone-exists-batch/llms.txt): no limit, 33% complete
- [Z-API, R$13,998 monthly, Plano Partner, 200 a 499 instâncias, POST /instances/{instanceId}/token/{token}/phone-exists-batch](https://datacircle.dev/check-whatsapp-apis/z-api/r-13998-monthly-plano-partner-200-a-499-instancias-post-instances-instanceid-token-token-phone-exists-batch/llms.txt): no limit, 33% complete
- [Z-API, $21,980 monthly, Partner Plan, 2,000 or more instances, POST /instances/{instanceId}/token/{token}/phone-exists-batch](https://datacircle.dev/check-whatsapp-apis/z-api/21980-monthly-partner-plan-2000-or-more-instances-post-instances-instanceid-token-token-phone-exists-batch/llms.txt): no limit, 33% complete
- [Z-API, R$32,495 monthly, Plano Partner, 500 a 999 instâncias, POST /instances/{instanceId}/token/{token}/phone-exists-batch](https://datacircle.dev/check-whatsapp-apis/z-api/r-32495-monthly-plano-partner-500-a-999-instancias-post-instances-instanceid-token-token-phone-exists-batch/llms.txt): no limit, 33% complete
- [Z-API, R$59,990 monthly, Plano Partner, 1.000 a 1.999 instâncias, POST /instances/{instanceId}/token/{token}/phone-exists-batch](https://datacircle.dev/check-whatsapp-apis/z-api/r-59990-monthly-plano-partner-1-000-a-1-999-instancias-post-instances-instanceid-token-token-phone-exists-batch/llms.txt): no limit, 33% complete
- [Z-API, R$109,980 monthly, Plano Partner, 2.000 ou mais instâncias, POST /instances/{instanceId}/token/{token}/phone-exists-batch](https://datacircle.dev/check-whatsapp-apis/z-api/r-109980-monthly-plano-partner-2-000-ou-mais-instancias-post-instances-instanceid-token-token-phone-exists-batch/llms.txt): no limit, 33% complete
- [Z-API, $215.90 yearly, Ultimate Plan, POST /instances/{instanceId}/token/{token}/phone-exists-batch](https://datacircle.dev/check-whatsapp-apis/z-api/215-90-yearly-ultimate-plan-post-instances-instanceid-token-token-phone-exists-batch/llms.txt): no limit, 33% complete
- [Z-API, R$1,079.89 yearly, Plano Ultimate, POST /instances/{instanceId}/token/{token}/phone-exists-batch](https://datacircle.dev/check-whatsapp-apis/z-api/r-1079-89-yearly-plano-ultimate-post-instances-instanceid-token-token-phone-exists-batch/llms.txt): no limit, 33% complete

## Z-API's calls (2)

- `POST /instances/{instanceId}/token/{token}/phone-exists-batch`: [Z-API, free trial, 2 days, POST /instances/{instanceId}/token/{token}/phone-exists-batch](https://datacircle.dev/check-whatsapp-apis/z-api/free-trial-2-days-post-instances-instanceid-token-token-phone-exists-batch/llms.txt)
- `GET /instances/{instanceId}/token/{token}/phone-exists/{phone}`: [Z-API, free trial, 2 days, GET /instances/{instanceId}/token/{token}/phone-exists/{phone}](https://datacircle.dev/check-whatsapp-apis/z-api/free-trial-2-days-get-instances-instanceid-token-token-phone-exists-phone/llms.txt)

## Z-API's APIs (1)

- [Z-API WhatsApp number check API pricing, 19 plans, POST /instances/{instanceId}/token/{token}/phone-exists-batch](https://datacircle.dev/check-whatsapp-apis/z-api/free-trial-2-days-post-instances-instanceid-token-token-phone-exists-batch/llms.txt)

## Z-API: WhatsApp number check API alternatives

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

We list other providers' plans closest to this plan in price per 1,000 phones.

- [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
- [CheckNumber.AI, free trial, POST /v1/tasks, WhatsApp Age & Gender Checker](https://datacircle.dev/check-whatsapp-apis/checknumber-ai/free-trial-post-v1-tasks-whatsapp-age-gender-checker/llms.txt): $0.00 per 1,000, 33% complete
- [Credify, free](https://datacircle.dev/check-whatsapp-apis/credify/free/llms.txt): $0.00 per 1,000, 17% complete, live
- [ZelNum, free](https://datacircle.dev/check-whatsapp-apis/zelnum/free/llms.txt): $0.00 per 1,000, 0% complete

## 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://developer.z-api.io/_llms/en/api-reference.txt?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=whatsapp-number-check-api-pricing
- https://developer.z-api.io/en/contacts/get-iswhatsapp?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=whatsapp-number-check-api-pricing
- https://developer.z-api.io/en/contacts/get-iswhatsapp-batch?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=whatsapp-number-check-api-pricing
- https://developer.z-api.io/en/quickstart/introduction?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=whatsapp-number-check-api-pricing
- https://www.z-api.io/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=whatsapp-number-check-api-pricing