Bulk Verify WhatsApp Numbers via Google Sheets & WasenderAPI

This n8n workflow enables efficient bulk verification of WhatsApp numbers pulled from a Google Sheet, leveraging the unofficial WasenderAPI for real-time checks without the official WhatsApp Business API. It processes lists in batches with built-in delays to respect rate limits, marking each number as verified or unverified and logging status updates directly back to the sheet. Perfect for cleaning large phone datasets quickly and affordably.

Key features include fetching data from a structured Google Sheet (with columns for WhatsApp No, Verified status, and Status), API calls to WasenderAPI using your own WhatsApp account for authentication, and seamless write-back of results. This eliminates manual checking, reduces errors, and scales to unlimited numbers, saving hours of tedious work.

Ideal for marketers validating leads, CRM teams maintaining contact lists, support agents qualifying inquiries, and data verifiers ensuring list quality. Requires a WasenderAPI subscription (~$6/month), Google Sheets API setup in n8n, and a sample sheet format. Setup involves authenticating nodes, selecting your sheet, and configuring filters for unprocessed rows—run manually or on schedule for ongoing hygiene.