Boundry with TanStack Start

Call the server-only helper from a server function; never serialize the API key to the client.

Install

This guide uses the official @boundry/sdk package. Its generated source is public on GitHub.

terminalShell

Shell

npm install @boundry/sdk

Add the server-side helper

Store BOUNDRY_API_KEY in the framework’s secret or server environment. Never include a project key in browser code.

src/server/email.ts

typescript

import Boundry from '@boundry/sdk';

const client = new Boundry({
  apiKey: process.env.BOUNDRY_API_KEY,
});

export async function sendWelcomeEmail(to: string) {
  return client.emails.send({
    from: 'Acme <hello@acme.com>',
    to,
    subject: 'Welcome to Acme',
    html: '<p>It works.</p>',
  });
}

Production checklist

Send only from a domain verified in this regional project.
Move user-facing sends to the framework’s job system when available.
Reuse an idempotency key if you retry after an uncertain response.