Contactá solo
a quien vale
la pena.

Authorization: Bearer TU_API_KEY

curl -X POST https://api.contacttech.com.ar/v1/validate \
  -H "Authorization: Bearer TU_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "numbers": [
      "+5491112345678",
      "+5491187654321",
      "1156781234"
    ]
  }'

{
  "results": [
    {
      "number": "+5491112345678",
      "has_whatsapp": true
    },
    {
      "number": "+5491187654321",
      "has_whatsapp": false
    },
    {
      "number": "1156781234",
      "has_whatsapp": true
    }
  ],
  "total": 3,
  "valid": 2,
  "invalid": 1
}

const response = await fetch(
  'https://api.contacttech.com.ar/v1/validate',
  {
    method: 'POST',
    headers: {
      'Authorization': 'Bearer TU_API_KEY',
      'Content-Type': 'application/json'
    },
    body: JSON.stringify({
      numbers: ['+5491112345678', '+5491187654321']
    })
  }
);

const data = await response.json();
const activos = data.results.filter(r => r.has_whatsapp);
console.log(`${activos.length} números con WhatsApp`);