🪶 Simple JSON API

Collect emails.
Ship faster.

A tiny JSON API for email signups and feedback. Two endpoints. Zero config. Globally fast.

Try it live See the code

Why builders love it

⚡

Stupid fast

Sub-50ms responses worldwide. Your API calls come back before your users blink.

🪙

Dirt cheap

Free tier to get started. Paid plans from $8/mo. Way cheaper than Formspree.

🔌

Two endpoints

/signup and /feedback. POST JSON, get JSON back. That's it.

🧹

Auto-dedupe

Same email, same product? Only stored once. No duplicates ever.

🔔

Slack alerts

Get notified instantly when someone signs up or drops feedback.

🐦

Multi-product

One worker, many products. Just pass a different product slug.

Two lines. Seriously.

POST JSON, get JSON. Your grandma could integrate this.

await fetch('https://wrensend.com/signup', {
  method: 'POST',
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify({
    email: 'user@example.com',
    product: 'myapp'
  })
})
// → { "ok": true }
await fetch('https://wrensend.com/feedback', {
  method: 'POST',
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify({
    message: 'Love it!',
    product: 'myapp',
    email: 'user@example.com'  // optional
  })
})
// → { "ok": true }
curl -X POST https://wrensend.com/signup \
  -H "Content-Type: application/json" \
  -d '{"email":"user@example.com","product":"myapp"}'

# → {"ok":true}

Up and running in 3 steps

Add your origin

Add your domain to the CORS allowlist in your config.

Deploy

Run npm run deploy. That's one command.

POST away

Fire JSON at /signup or /feedback from your frontend.

Pricing

The kind of pricing indie hackers dream about.

Free

1 product
100 signups / mo
50 feedback / mo
Slack notifications
Auto-dedupe

Get started

popular

Builder / mo

5 products
2,000 signups / mo
1,000 feedback / mo
Slack notifications
Auto-dedupe

Start building

$19

Pro / mo

Unlimited products
20,000 signups / mo
10,000 feedback / mo
Slack notifications
Auto-dedupe

Go Pro

Try it right now

This form hits the real WrenSend API. Go ahead.

Collect emails. Ship faster.