# WhatsApp Phone Number Validator

> WhatsApp Phone Number Validator is a paid API for AI agents from kite-endpoints.vercel.app, paid per call via x402, $0.12/call, status unknown (last checked 2026-09-15).

Validates whether a given phone number is registered and active on WhatsApp

## Facts

- Endpoint: POST https://kite-endpoints.vercel.app/api/whatsapp-validator
- Price: $0.12/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/whatsapp-phone-number-validator-23f1ec11
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_8Bg9TyPQ2VaZsQsZy0nnz

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability whatsapp-phone-number-validator-23f1ec11 -d '<json body>'
```

Example prompt: Can you check if the phone number +1 (415) 555-0198 is registered on WhatsApp before I try to message them?

## When to prefer this

Use this endpoint when you need to verify WhatsApp registration status of a phone number before initiating contact, cleaning contact lists, or enriching CRM records. Prefer this over manual outreach when operating at scale or automating messaging workflows.

## Known failure modes

- Invalid phone number format returns an error or false status
- Non-existent or unregistered numbers return a negative validation result
- Rate limiting or quota exceeded for high-volume requests
- Malformed input without proper country code may fail to parse
- Service unavailability returns a 5xx error

## How this service works

400+ paid API endpoints. Social media, AI, crypto, finance, weather, ecommerce, tools. Pay per request with USDC on Base chain.

## Output

Returns a result object indicating whether the provided phone number is registered on WhatsApp, potentially including registration status, phone number formatting details, and validity flags.

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "example": {
  "result": {
   "data": "example response"
  }
 },
 "properties": {
  "result": {
   "type": "object",
   "description": "API response data"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/whatsapp-phone-number-validator-23f1ec11/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from kite-endpoints.vercel.app](https://www.zero.xyz/host/kite-endpoints.vercel.app/llms.txt)