How to Launch a Niche Micro-SaaS with OpenRouter and Zero Hosting Cost

Micro-SaaS is booming in 2025. I launched a working tool using OpenRouter + Cloudflare Workers with no server cost. Here’s how you can too.

The Problem

Developers want tools that do 1 thing well: summarize docs, generate pitch decks, rewrite product descriptions, etc.

The Solution

Use OpenRouter + Cloudflare Workers to create fast, scalable APIs with zero ops overhead.

Stack Used

• Compute: Cloudflare Workers (free tier)

• AI: OpenRouter API

• Frontend: Static site on Vercel

• Payments: LemonSqueezy

Features

• Input box → instant AI output

• No DB, no backend server

• Monetized API key usage

Setup Steps

• Create Cloudflare Worker with fetch + POST

• Connect OpenRouter API

• Serve static page w/ JS fetch call

• Track usage with counter

Monetization Strategy

• Offer free tier (10 uses/day)

• Upgrade removes usage limits

• Email list with ConvertKit or Buttondown

👉 https://gum.co/u/rgikbz7g