Verify Active WhatsApp Numbers
Clean your contact lists before sending. Identify valid WhatsApp users instantly to reduce costs and improve campaign ROI.
Why Filter Your Lists?
Sending messages to invalid numbers wastes budget and risks your sender reputation. Clean your data first.
Save Costs
Don't pay for messages that will never be delivered. Filter out landlines and non-WhatsApp numbers.
Protect Reputation
High failure rates can flag your account as spam. Maintain a high delivery rate to keep your quality score high.
Get User Insights
Identify Business Accounts vs. Personal Accounts to tailor your messaging strategy appropriately.
Integrate Number Checking
Validate numbers on the fly during user signup or batch process your existing database with our high-speed API.
- Synchronous or Asynchronous modes
- Bulk batch processing (up to 10k numbers/req)
- Detailed status codes and timestamps
const isvix = require('isvix-sdk')('YOUR_KEY');
// Check a single number
const result = await isvix.whatsapp.lookup('+14155552671');
if (result.status === 'valid') {
console.log('User exists on WhatsApp!');
console.log('Account Type:', result.accountType); // 'BUSINESS' or 'PERSONAL'
} else {
console.log('Number not registered.');
}
// Batch check
const batch = await isvix.whatsapp.lookupBatch([
'+14155550001',
'+14155550002',
'+14155550003'
]);Clean Your Lists Today
Sign up now and get 100 free number checks to test our accuracy.