Balance Template

Balance-based billing template with fixed unit prices. Customers prepay a balance and usage deducts real dollars per action. Two plans (Starter, Pro) with different balances. Features have fixed per-unit costs (API calls, image processing).

Stack: Next.js 16, Better Auth, Drizzle ORM, PostgreSQL, Commet SDK

Quick Start

commet create my-app -t balance-fixed
cd my-app
pnpm install
pnpm dev

What's Included

• Two plans with different starting balances ($25, $75)
• Two features with fixed unit prices (API Call, Image Processing)
• Balance deduction per usage at fixed rates
• Block on exhaustion — usage stops when balance runs out
• Interactive usage demo on dashboard
• Customer billing portal with top-up support
• Pricing page with balance amounts

Key Files

• lib/auth/auth.ts — Better Auth + Commet plugin with usage module
• lib/payments/commet.ts — Checkout session creation
• app/(dashboard)/dashboard/page.tsx — Balance overview with usage simulation
• app/pricing/page.tsx — Dynamic pricing page
• app/api/commet/portal/route.ts — Customer portal redirect

Learn More

• Consumption Models — Balance model details
• Track Usage
• Customer Portal