Server data from the Official MCP Registry
Verify US phone numbers: line type, carrier, and TCPA litigator status via the NumberBroom API.
About
Verify US phone numbers: line type, carrier, and TCPA litigator status via the NumberBroom API.
Remote endpoints: streamable-http: https://numberbroom.com/mcp
Security Report
NumberBroom MCP is a well-architected, security-conscious proxy server that correctly implements authentication and safe API forwarding. The server properly validates authorization headers before making requests, avoids storing secrets, and implements appropriate error handling. Code quality is high with comprehensive tests and no code execution risks. Supply chain analysis found 2 known vulnerabilities in dependencies (1 critical, 0 high severity).
5 files analyzed · 4 issues found
Security scores are indicators to help you make informed decisions, not guarantees. Always review permissions before connecting any MCP server.
Permissions Required
This plugin requests these system permissions. Most are normal for its category.
How to Install & Connect
Available as Local & Remote
This plugin can run on your machine or connect to a hosted endpoint. during install.
Documentation
View on GitHubFrom the project's GitHub README.
NumberBroom MCP Server
A remote MCP server that lets AI agents (Claude, ChatGPT, and other MCP-compatible clients) verify US phone numbers through the NumberBroom API: carrier-level line type, carrier name, an activity score, and TCPA litigator status.
This server is a thin, stateless proxy. It has no database and runs no OAuth flow — it forwards
your NumberBroom API key straight through to https://numberbroom.com/api/v1, which already
owns authentication, rate limiting, billing, and abuse protection. See
numberbroom.com/developers for the underlying REST API
this wraps.
Tools
| Tool | Description | Cost |
|---|---|---|
verify_phone_number | Line type, carrier, activity score, TCPA litigator flag for one US number. | $0.20/call, charged to your NumberBroom credit balance. Unparseable numbers are not charged. |
get_credit_balance | Remaining pre-paid credit balance on your NumberBroom account. | Free. |
Get an API key
- Sign up at numberbroom.com and add credit to your account.
- Generate an API key at numberbroom.com/settings.
Connect a client
Add this server as a remote MCP connection using its deployed URL,
https://numberbroom.com/mcp, with your NumberBroom API key as a Bearer token in the
Authorization header:
Authorization: Bearer nb_live_YOUR_KEY
Exactly how you set that header depends on the client — most MCP-capable apps that support remote servers let you add a custom header per connection.
Local development
npm install
npm run dev
This starts the server at http://localhost:8787/mcp via wrangler dev.
Deploy
npm run deploy
Deploys to Cloudflare Workers as numberbroom-mcp. Requires a Cloudflare account
authenticated via wrangler login.
Why a proxy, not a rewrite
Every tool call here is a direct, unmodified pass-through to NumberBroom's own /api/v1
endpoints. That means:
- Auth, rate limiting (5,000 lookups/key/day), the circuit breaker, and billing are all enforced exactly once, by NumberBroom's own API — this server does not duplicate or second-guess any of it.
- A number that fails to parse costs nothing, same as calling the REST API directly.
- This server never sees or stores your API key beyond the lifetime of a single request; each MCP tool call constructs an isolated server instance with no shared state between callers.
License
MIT
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