stonex-mcp

Typed TypeScript client for the StoneX Client (torchapi) REST API, plus an MCP server that exposes those endpoints as tools.

Auth is not automated (no Okta/MFA in this project). You log into StoneX Client in a browser, export a cookies.txt file, and pass the path to that file on the CLI.

Requirements

• Bun 1.1+ (for local development / prepare build)

• Node.js 18+ (to run the published bin bundle)

Related MCP server: tradier-mcp

Install

bun install

Auth: cookies.txt

1. Install a browser extension that exports Netscape cookies.txt (e.g. Get cookies.txt LOCALLY).

2. Log into https://client.stonex.com/client/.

3. Export cookies for client.stonex.com to a file (e.g. client.stonex.com_cookies.txt).

4. Pass that path to the server:

stonex-mcp --cookies /path/to/client.stonex.com_cookies.txt

The server reads session cookies from that file and calls GET https://client.stonex.com/client/token only when it needs a Bearer JWT.

Token cache

Derived access tokens are cached on disk so repeated MCP tool calls do not mint a new token every time:

When the cached JWT is missing or near expiry, a new token is requested using the cookies file and written back to the cache. If refresh starts failing with 401, re-export cookies after logging into StoneX Client again.

Treat the cookies file and cached token like passwords. Do not commit them.

Run the MCP server

bun start -- --cookies /path/to/client.stonex.com_cookies.txt
# or after build:
node dist/stonex-mcp.js --cookies /path/to/client.stonex.com_cookies.txt

Cursor / Claude Desktop config

{
  "mcpServers": {
    "stonex": {
      "command": "npx",
      "args": [
        "-y",
        "stonex-mcp",
        "--cookies",
        "C:/Users/YOU/Downloads/client.stonex.com_cookies.txt"
      ]
    }
  }
}

npx runs the built Node bundle (dist/stonex-mcp.js, produced by bun run build / prepare). Local equivalent: "command": "bun", "args": ["run", "/path/to/stonex-mcp/src/cli.ts", "--cookies", "/path/to/cookies.txt"].

Typed client

import { StoneXClient } from "./src/client/index.ts";
import { sessionCookieFromCookiesTxtFile } from "./src/auth/cookiesTxt.ts";
import { resolveAuth } from "./src/auth/resolveAuth.ts";
import { writeTokenCache } from "./src/auth/tokenCache.ts";

const { accessToken, sessionCookie } = await resolveAuth(
  "/path/to/client.stonex.com_cookies.txt",
);

const client = new StoneXClient({
  accessToken,
  sessionCookie,
  onAccessToken: (token) => writeTokenCache(token),
});

const accounts = await client.getAccounts();
const summary = await client.getAccountSummary({
  accountNumber: accounts[0]!.acctNo,
});

Or build a cookie header yourself with sessionCookieFromCookiesTxtFile(...).

Endpoints mirror the StoneX Client SPA (https://vulcan.stonex.com/torchapi): accounts, balances, summary, positions, activity, performance, projected income, documents, and related user/account metadata.