Billet by Lago

A demo SaaS billing application built with Next.js and Lago (open-source billing engine). Simulates a real billing flow with plans, subscriptions, usage tracking, and invoices.

Features

• Pricing plans: Standard ($10/mo), Premium ($20/mo), Gold ($50/mo)
• Usage-based billing: Simulate API calls ($0.01/unit) and storage ($1.00/GB)
• Invoice tracking: View generated invoices on the dashboard
• Lago integration: All billing logic handled by a local Lago instance

Quick Start

1. Start Lago (requires Docker):

   docker run -d --name lago -p 80:80 -p 3000:3000 getlago/lago:latest

2. Configure environment:

   cp .env.example .env.local

   Add your Lago API key (found at http://localhost → Developers → API Keys).

3. Install and run:

   npm install
   npm run dev

4. Open http://localhost:3001 in your browser.

Tech Stack

• Next.js 16 (App Router)
• React 19
• Tailwind CSS 4
• Lago JavaScript Client

For detailed setup and architecture, see SETUP.md.