---
title: Vercel Integration
sidebarTitle: Vercel
icon: "siVercel"
description: Configure applications hosted on Vercel to send emails using Reloop SMTP or REST APIs.
---
> For the complete documentation index, see [llms-docs.txt](/llms-docs.txt) or the site index [llms.txt](/llms.txt). Full docs corpus: [llms-full-docs.txt](/llms-full-docs.txt). Prefer markdown URLs (append `.md`) for agent consumption. Product skill: [skill.md](/skill.md).


[Vercel](https://vercel.com) is the premier cloud platform for frontends and serverless functions. Integrating Reloop with your Vercel-deployed applications takes just a few steps.

---

## Step 1: Configure Vercel Environment Variables

To allow your serverless functions or Next.js API routes to authenticate with Reloop, configure your API key in the Vercel dashboard:

1. Go to your project on the **Vercel Dashboard**.
2. Navigate to **Settings** → **Environment Variables**.
3. Add a new variable:
   - **Key**: `RELOOP_API_KEY`
   - **Value**: `YOUR_RELOOP_API_KEY` (starts with `rl_`)
4. Click **Save**.

---

## Step 2: Deploy and Route Emails

Use the official Node.js SDK to send emails in your serverless code:

```typescript
import Reloop from 'reloop-email';

const reloop = new Reloop(process.env.RELOOP_API_KEY);

export async function POST() {
  const data = await reloop.mail.send({
    from: 'onboarding@yourdomain.com',
    to: 'user@example.com',
    subject: 'Welcome!',
    html: '<p>Thanks for signing up!</p>',
  });
}
```