# WasapFlow, free: WhatsApp number check API

> Always check if a number is on WhatsApp before sending to avoid failed deliveries and Meta penalties.

WasapFlow's Free to Start plan for the WhatsApp number check API costs $0.00 per 1,000 phones. We check each provider's docs for 6 fields. WasapFlow's docs list 2: On WhatsApp, WhatsApp ID.
You get as many calls as you like.
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/wasapflow/free
- Get it: https://partner.wasapflow.com/bridge/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=whatsapp-number-check-api-pricing
- Request: `GET https://officialapi.wasapflow.com/bridge/v1/contacts/{phone}`
- API key: with the plan, on https://partner.wasapflow.com/bridge/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=whatsapp-number-check-api-pricing
- Its API docs: https://partner.wasapflow.com/bridge/docs?tab=api&utm_source=datacircle.dev&utm_medium=referral&utm_campaign=whatsapp-number-check-api-pricing
- Sold by: WasapFlow (https://wasapflow.com?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=whatsapp-number-check-api-pricing)
- Checked: 2026-11-09

## In the answer

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

## Price

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

## Charges

- Also pays for: 67 other WasapFlow calls

## Not found

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

## In their words

- Their pitch: Always check if a number is on WhatsApp before sending to avoid failed deliveries and Meta penalties.

## Data

- What it checks: messaging apps
- Keep data: no limit
- Use data: You agree NOT to use the Service to: Send spam, unsolicited messages, or bulk promotional content without consent. Harass, abuse, threaten, or intimidate others. Transmit malware, viruses, or harmful code. Violate WhatsApp Terms of Service or Business Policy. Impersonate any person or entity. Engage in illegal activities or promote illegal content. Collect user data without proper consent. As our Service integrates with WhatsApp Business API, you must comply with WhatsApp Business Terms of Service, WhatsApp Business Policy, WhatsApp Commerce Policy, and Meta Platform Terms.

## Plan

- Pay: $0
- Enough for: no limit

## Rate limit

- Batch: 1

## Speed

- Answer: in the call

## The call

- You send: phone, x-waba-id header
- Method: GET
- Path: /contacts/{phone}

## About the plan

- Plan: Free to Start
- Who can get it: anyone aged 18 or over, or with legal parental/guardian consent, with a partner account: the first number is free for 3 days with no card, one free window per account

## The 3 fields the plan's answer can hold

phone number, registered on WhatsApp, WhatsApp ID

## WasapFlow's plans (2)

- [WasapFlow, free](https://datacircle.dev/check-whatsapp-apis/wasapflow/free/llms.txt): $0.00 per 1,000, 33% complete
- [WasapFlow, $10 monthly](https://datacircle.dev/check-whatsapp-apis/wasapflow/10-monthly/llms.txt): no limit, 33% complete

## WasapFlow's calls (1)

- `GET /contacts/{phone}`: [WasapFlow, free](https://datacircle.dev/check-whatsapp-apis/wasapflow/free/llms.txt)

## WasapFlow's APIs (1)

- [WasapFlow WhatsApp number check API pricing, 2 plans](https://datacircle.dev/check-whatsapp-apis/wasapflow/free/llms.txt)

## WasapFlow: WhatsApp number check API alternatives

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

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

- [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
- [Whapi.Cloud, free](https://datacircle.dev/check-whatsapp-apis/whapi-cloud/free/llms.txt): $0.00 per 1,000, 17% complete, stored
- [Wablas, free](https://datacircle.dev/check-whatsapp-apis/wablas/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 2026-11-09.

- https://officialapi.wasapflow.com/bridge/openapi.json?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=whatsapp-number-check-api-pricing
- https://partner.wasapflow.com/bridge/docs?tab=api&utm_source=datacircle.dev&utm_medium=referral&utm_campaign=whatsapp-number-check-api-pricing
- https://partner.wasapflow.com/bridge/docs?tab=guide&utm_source=datacircle.dev&utm_medium=referral&utm_campaign=whatsapp-number-check-api-pricing
- https://partner.wasapflow.com/bridge/faq?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=whatsapp-number-check-api-pricing
- https://partner.wasapflow.com/bridge/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=whatsapp-number-check-api-pricing
- https://wasapflow.com/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=whatsapp-number-check-api-pricing
- https://wasapflow.com/terms-of-service?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=whatsapp-number-check-api-pricing