Why edge runtimes excel at transactional email
Cloudflare Workers run in 300+ cities worldwide with zero cold starts. By pairing the ultrafast Hono framework with SadaSend REST endpoints, webhook ingestion and email dispatch execute with sub-10ms latency.
Complete Edge Worker (src/index.ts)
Here is the complete Hono worker deployed to Cloudflare Workers.
TYPESCRIPT
import { Hono } from 'hono';
type Bindings = {
SADASEND_API_KEY: string;
};
const app = new Hono<{ Bindings: Bindings }>();
app.post('/api/send-alert', async (c) => {
const body = await c.req.json<{ recipient: string; title: string; details: string }>();
const res = await fetch('https://api.sadasend.com/v1/emails', {
method: 'POST',
headers: {
'Authorization': `Bearer ${c.env.SADASEND_API_KEY}`,
'Content-Type': 'application/json',
},
body: JSON.stringify({
to: body.recipient,
subject: `[Alert] ${body.title}`,
text: body.details,
}),
});
const data = await res.json();
return c.json(data, res.status as any);
});
export default app;Deployment in 30 Seconds
Deploy immediately with Wrangler: npx wrangler secret put SADASEND_API_KEY && npx wrangler deploy
Early Access
Building AI agents that send email?
Join the SadaSend early access waitlist to get scoped API keys, recipient allowlists, and Model Context Protocol (MCP) servers upon launch.