---
title: "QuotaStack Use Cases"
description: "End-to-end billing models for common product types — SaaS, consumer AI, AI apps, AI agent companies, and API platforms."
---

# QuotaStack Use Cases

End-to-end models for billing real products. Each use case has a full agent-readable page at the same URL + `.md`.

- [SaaS Subscription: Recurring Plans with Monthly Credit Grants](/docs/use-cases/saas-subscription.md): How to model a classic B2B SaaS with tiered subscription plans, monthly credit grants, rollover, overage policies, and plan upgrades.
- [Consumer AI Subscription: Tiers with Resetting Quotas](/docs/use-cases/consumer-ai-subscription.md): How to model a ChatGPT Plus- or Claude Pro-style consumer AI subscription with fixed monthly pricing and quotas that reset on a sub-monthly cadence.
- [AI Chat App: Wallet + Plans + Per-Message Metering](/docs/use-cases/ai-chat-app.md): How to model an AI companion chat app with wallet-based credits, time-limited plans purchased from the wallet, and per-message metering.
- [AI Generation App: Packs + Reserve/Commit/Release](/docs/use-cases/ai-generation-app.md): How to model an AI outfit generation app with look packs, free credits on signup, and credit reservations for long-running AI calls.
- [API Platform: Postpaid Metered Billing](/docs/use-cases/api-platform.md): How to model a usage-based API platform with postpaid billing, tiered pricing, usage summaries, and contract lifecycle management.
- [AI Agent Company: Outcome-Based Billing with Long Reservations](/docs/use-cases/ai-agent-company.md): How to bill for work, not seats — model an AI agent company (AI SDR, AI paralegal, AI bookkeeper) with outcome-based pricing, long-running reservations, variable cost pass-through, and per-customer spend caps.