Service type: ws

WhatsApp Registration Check

Confirm whether a phone number is registered on WhatsApp.

Usage cost1 credit per check

Response modeSynchronous

API endpointPOST /api/v1/check

What it checks

What does WhatsApp Registration Check return?

A fast, cost-effective option for cleaning contact lists before messaging, routing leads, or starting an outreach workflow.

Best for

Use this product when you need

Contact list cleaning
Lead qualification
Pre-send validation
CRM data quality

API contract

One request, immediate result

Read full API docs

Send one E.164 phone number and select this product with service_type. Authentication uses your API key.

RequestPOST /api/v1/check

{
  "service_type": "ws",
  "identifier": "+14155552671"
}

Response200 OK

{
  "code": 0,
  "msg": "ok",
  "data": {
    "id": 123,
    "identifier": "+14155552671",
    "registered": true,
    "transaction_id": "chk_example123",
    "status": "success",
    "service_type": "ws",
    "charged_credits": 1
  }
}

Product FAQ

Questions about Registration Check

What does WhatsApp Registration Check check?

It checks one phone number and returns registration status in the same synchronous response.

How much does Registration Check cost?

Each completed check uses 1 credit. Failed or undetermined upstream requests do not keep the charge.

What phone number format is required?

Use E.164 format with the country code, for example +14155552671.

Choose the right product

ws_avatarWhatsApp Avatar Check2 credits per check ws_businessWhatsApp Business Account Check2 credits per check

Start checking now

Create an account and get 20 credits for real checks across all three products via the web checker or API.