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- WhatsApp Number Validation API
- Check WhatsApp numbers at scale
- Add WhatsApp checks to your app via simple API
- cURL example for quick integration
NumRadar validates if phone numbers are registered on WhatsApp via API, bulk upload, AI agents, or Chrome extension.
- for
- Developers and teams needing WhatsApp registration status for outreach campaigns.
- pricing
- paid
Key features
- REST API — Check a single number in real-time and receive JSON with WhatsApp status.
- Bulk CSV Upload — Upload a spreadsheet, deduplicate, and get registration results for up to 5-300k numbers per month.
- AI Agent Integration (MCP) — Connect through MCP to let agents like Claude or Cursor query numbers in bulk.
- Chrome Extension — Highlight numbers on any web page and instantly see WhatsApp registration.
- Automatic Result Notifications — Growth, Business and Enterprise plans receive webhook notifications of completed checks.
- Unused Checks Carry Over — Unused validations are kept for one extra month on paid plans.
Use cases
- Validate a lead list before a WhatsApp marketing campaign
- Add WhatsApp status to CRM contacts to route customers to the right channel
- Check phone numbers on a checkout form to decide whether to send a login code via WhatsApp
- Use an AI agent to bulk-verify numbers during a sales outreach workflow
- Scan numbers on a web directory with the Chrome extension and open chats for registered contacts
NumRadar vs alternatives
 NumRadar |  Vonage |  Twilio |  SendGrid |  Postman | |
|---|---|---|---|---|---|
| Best for | WhatsApp registration checks for bulk contacts | SMS and voice communication APIs | WhatsApp messaging and verification | Transactional email delivery | Designing and testing APIs |
| Pricing | Paid | Subscription | Subscription | Subscription | Subscription |
| DevHunt upvotes | 1 | 0 | 0 | 0 | 0 |
| Launched | Nov 2026 | — | — | — | — |
- NumRadar vs Vonage: Vonage provides SMS/voice/verification APIs but not WhatsApp registration checks.
- NumRadar vs Twilio: Twilio offers WhatsApp messaging APIs but focuses on sending messages, not validating registration status.
- NumRadar vs SendGrid: SendGrid is an email delivery service, unrelated to phone number validation.
- NumRadar vs Postman: Postman is an API testing tool, not a validation service for WhatsApp numbers.
NumRadar FAQ
What does a validation tell me?+
It indicates whether the number is registered on WhatsApp and, if so, whether it is a business account.
Do invalid numbers count against my allowance?+
No, invalid numbers and failed lookups do not use your validation allowance.
Can I keep unused validations?+
Unused monthly validations are retained for one extra month on paid plans.
What happens when I run out of validations?+
You can upgrade your plan or purchase extra validations; Business and Enterprise customers can also buy extra blocks.
Is a WhatsApp account required to use NumRadar?+
No, you never connect your own WhatsApp account; checks run on NumRadar’s side.
How are extra validations billed?+
Extra validations are a one-time payment of €99 (or $99) per 100,000 validations and never expire.
Summarized by DevHunt from numradar.app · Oct 31, 2026. Details may change; check the official site.
