# Blockbuster.ai WhatsApp Validator

> Blockbuster.ai WhatsApp Validator is a paid API for AI agents from blockbuster-ai.vercel.app, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-15).

Validates whether a phone number is registered and active on WhatsApp

## Facts

- Endpoint: POST https://blockbuster-ai.vercel.app/api/whatsapp-validator3
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/blockbuster-ai-whatsapp-validator-c139aecc
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_kxoxa4w7lth37fK73h5wF

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 blockbuster-ai-whatsapp-validator-c139aecc -d '<json body>'
```

Example prompt: Can you check if the phone number +14155552671 is registered on WhatsApp before I try to message them?

## When to prefer this

Use this endpoint when you need to verify whether a contact's phone number is active on WhatsApp before initiating outreach, building contact lists, or automating WhatsApp messaging workflows. Prefer this over manual checks or broader social media validators when the specific platform is WhatsApp and you need a programmatic, pay-per-call validation at low cost ($0.05 USDC).

## Known failure modes

- Invalid or malformed phone number format returns an error or false validation
- Network timeout from WhatsApp lookup service
- Rate limiting or quota exceeded on the underlying API
- Missing query parameter returns a 400-level error
- Phone number in unsupported country or region may return inconclusive result

## How this service works

115+ premium paid endpoints: Social Media, AI/ML, E-commerce, Finance, Data Intelligence, Media, Tools. x402 micropayments on Base chain.

## Output

Returns a JSON object with a success boolean and a data object indicating whether the queried phone number is registered and active on WhatsApp.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "query": {
   "type": "string",
   "description": "Input parameter for the API call"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "data": {
   "type": "object"
  },
  "success": {
   "type": "boolean"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/blockbuster-ai-whatsapp-validator-c139aecc/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from blockbuster-ai.vercel.app](https://www.zero.xyz/host/blockbuster-ai.vercel.app/llms.txt)