Numbers Online MCP MCP server

An official Model Context Protocol server provided by Numbers Online that enables AI voice agents to perform read-only phone intelligence tasks. It exposes tools for phone number lookup, line type identification, caller risk assessment, do-not-call list scrubbing, and reassigned number checks, integrating directly with AI platforms like Vapi and Retell.

Endpoint and access

No sign-in: your client connects and lists tools immediately, with no account or key.

No sign-inEndpoint checked 2026-10-05Operated by Numbers Online

MCP endpoint (Streamable HTTP)

https://numbers.online/api/v1/mcp

Vendor documentation

What you can do with it

Perform phone number lookup to determine line type and carrier
Assess caller risk and spam signals for inbound calls
Check numbers against do-not-call lists before dialing
Identify if a phone number has been reassigned

Tools advertised by the last live check:

phone_lookup
line_type
caller_risk
dnc_check

Connect from your client

Each snippet registers the same endpoint; pick the client you use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Claude Code

Run this once in a terminal. It registers a Streamable HTTP server. Use --scope project to write .mcp.json for the repo.

Claude Code configuration

claude mcp add --transport http numbers-online-mcp https://numbers.online/api/v1/mcp

Codex

Run this once. Codex stores MCP servers in ~/.codex/config.toml (or .codex/config.toml in a trusted project).

Codex configuration

codex mcp add numbers-online-mcp --url https://numbers.online/api/v1/mcp

Cursor

Merge this server into .cursor/mcp.json in your project, then enable numbers-online-mcp in your MCP settings.

Cursor configuration

{
  "mcpServers": {
    "numbers-online-mcp": {
      "url": "https://numbers.online/api/v1/mcp"
    }
  }
}

Cline

Merge this into cline_mcp_settings.json (Cline → MCP Servers → Configure). The type must be streamableHttp for a remote HTTP server.

Cline configuration

{
  "mcpServers": {
    "numbers-online-mcp": {
      "type": "streamableHttp",
      "url": "https://numbers.online/api/v1/mcp",
      "disabled": false
    }
  }
}

VS Code

Merge this server into .vscode/mcp.json. Use MCP: List Servers to start numbers-online-mcp and inspect its tools.

VS Code configuration

{
  "servers": {
    "numbers-online-mcp": {
      "type": "http",
      "url": "https://numbers.online/api/v1/mcp"
    }
  }
}

Gemini CLI

Run this once. It writes .gemini/settings.json in the current project; pass --scope user for ~/.gemini/settings.json.

Gemini CLI configuration

gemini mcp add --transport http numbers-online-mcp https://numbers.online/api/v1/mcp

Claude Desktop

Merge this into claude_desktop_config.json (macOS: ~/Library/Application Support/Claude/, Windows: %APPDATA%\Claude\), then restart Claude Desktop.

Claude Desktop configuration

{
  "mcpServers": {
    "numbers-online-mcp": {
      "url": "https://numbers.online/api/v1/mcp"
    }
  }
}

Windsurf

Merge this into ~/.codeium/windsurf/mcp_config.json, then refresh MCP in Cascade. Windsurf remote servers use serverUrl, not url.

Windsurf configuration

{
  "mcpServers": {
    "numbers-online-mcp": {
      "serverUrl": "https://numbers.online/api/v1/mcp"
    }
  }
}

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