# KiteEndpoints WhatsApp Phone Number Validator

> KiteEndpoints WhatsApp Phone Number Validator is a paid API for AI agents from kite-endpoints.vercel.app, paid per call via x402, $0.17/call, status unknown (last checked 2026-09-16).

Validates whether a phone number is registered on WhatsApp and returns its status

## Facts

- Endpoint: POST https://kite-endpoints.vercel.app/api/whatsapp-validator3
- Price: $0.17/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-16
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/kiteendpoints-whatsapp-phone-number-validator-e8a6e55a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_lpANECcrCXMXvUHUn1EL4

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 kiteendpoints-whatsapp-phone-number-validator-e8a6e55a -d '<json body>'
```

Example prompt: Can you check if the phone number +1-555-867-5309 is actually 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 attempting to send a message, build a contact list, or qualify leads for WhatsApp-based outreach. Prefer this over manual testing or bulk send attempts when accuracy and cost-efficiency matter for messaging campaigns.

## Known failure modes

- Invalid or malformed phone number format returns an error
- Phone number not registered on WhatsApp returns a negative validation result
- Rate limiting or payment failure (HTTP 402) if USDC payment not processed
- Network timeout if WhatsApp lookup is slow
- Missing country code causes validation failure

## 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 an object indicating whether the submitted phone number is registered and active on WhatsApp, along with any available account metadata such as validity status.

## 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/kiteendpoints-whatsapp-phone-number-validator-e8a6e55a/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)