NumRadar.app
Check whether phone numbers are registered on WhatsApp. Bulk uploads, REST API, MCP for AI agents, and a Chrome extension on one paid plan.
Check whether phone numbers are registered on WhatsApp. Bulk uploads, REST API, MCP for AI agents, and a Chrome extension on one paid plan.
This page is designed to help you find out whether NumRadar.app is good and if it is the right choice for you.
NumRadar checks whether phone numbers are registered on WhatsApp, so you can choose the channel before a campaign or reminder goes out. Upload a CSV or Excel list and download the results, call the REST API from your own app, let an AI agent check numbers over MCP, or check the numbers on a web page with the Chrome extension. You connect no WhatsApp account. Registered and not registered each use one validation; invalid numbers and failed lookups cost nothing. Plans from USD 9 a month.
Listed in
Bulk file checks
Upload a CSV or Excel list and download the results as CSV or JSON
REST API
Check one number and get its WhatsApp status as JSON
MCP for AI agents
Let an AI agent check numbers and run bulk jobs over MCP
Chrome extension
Check the numbers on a web page
Definitive-answer billing
Invalid and unknown numbers are free
No account to connect
No WhatsApp number, Business account or Cloud API app to connect
Per-number details
Business account, line type, country and a wa.me link per number
NumRadar runs on Google Cloud in europe-west1 (Belgium). It offers a REST API, a hosted MCP server over Streamable HTTP, an open-source MCP package on npm and a Manifest V3 Chrome extension.
You get a definitive answer before you send, and you connect no WhatsApp number, Business account or Cloud API app. Registered and not registered each use one validation. Invalid numbers and lookups that could not finish cost nothing, and an unfinished lookup comes back as Unknown, never as not registered.
One plan and one API key cover bulk CSV or Excel uploads, a REST API, MCP for AI agents and a Chrome extension. You pay for definitive answers only. Bulk lists and their results are deleted 30 days after the job ends, and the billing record of a validation never includes the number.
Marketing and operations owners who already hold phone lists, developers who want the check inside their own app, and sales or support staff who check numbers while browsing.
The WhatsApp API tells you a number is not registered when the send fails. By then the message is written and the schedule is set. NumRadar started in October 2026 as a bootstrapped side project to put that check before the send, for any team that has a phone list and needs to choose the channel.
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