Onlinesim MCP

Run a small local server, connect your AI client, and order receive-only numbers without leaving the chat.

What it is

Onlinesim MCP is a local CLI that exposes Onlinesim SMS APIs as Model Context Protocol tools over Streamable HTTP.

Public binaries and install scripts live on GitHub (on-org/onlinesim-mcp). Authenticate with your Onlinesim API key via onlinesim login or ONLINESIM_APIKEY — never pass the key in tool arguments.

  • One binary: CLI helpers and the MCP HTTP server.
  • Quick SMS verification and long-term rental tools.
  • Works with Cursor, Claude Code, VS Code, and Codex.
  • Project or global client install via onlinesim mcp install.
Default endpoint:http://127.0.0.1:8787/mcp

How it fits together

Your MCP client talks to the local onlinesim mcp process. That process calls the Onlinesim HTTP API with your stored key.

The MCP endpoint has no auth of its own — keep the default loopback bind, and leave onlinesim mcp running while the client is connected.

How it fits together

Where to go next