ZelNum

ZelNum is a pay-as-you-go API and web platform for verifying WhatsApp, Telegram, and phone data at scale. Businesses can run 40+ checks, clean and enrich contact lists, and process CSV/TXT files in bulk. ZelNum provides verification signals—not identity proof—and is intended for authorized data use.

ZelNum offers bulk verification for WhatsApp, Telegram, and phone numbers. It allows users to validate phone and carrier data, ensuring accurate messaging list hygiene. It supports over 40 checks across various platforms, tackling issues of inactive or unregistered accounts and facilitating efficient list cleaning for marketing and compliance purposes. Users upload phone number lists via CSV or TXT formats, or connect through an API. The system performs a series of checks for account presence, registration status, and risk levels. After processing, users can download cleaned segments segmented as valid, inactive, or risky, which can be utilized by various teams within an organization. ZelNum is designed for businesses that require bulk verification services, including marketing agencies, CRM operators, and fintech risk teams. Its emphasis on high-volume processing and API integration makes it suitable for organizations managing large datasets and needing precise insights into phone and account validation.