---
title: "QuotaStack — Credit-native usage-based billing behind one API"
description: "QuotaStack is credit-native usage-based billing for indie developers and startups — credits, metering, entitlements, reservations, and subscriptions behind one API. Free until you're billing real money."
---

# QuotaStack

Credit-native usage-based billing built for indie & solo developers and startups. Credits, metering, entitlements, reservations, and subscriptions behind one API — **free until you're billing real money**, with transparent public pricing and no sales call. A self-serve alternative to enterprise, sales-gated billing platforms.

## What it is

QuotaStack is the billing / metering / entitlement layer on top of your payment provider. It gives you the primitives that otherwise take months to build correctly:

- **Credits** — millicredit-precise balances stored as credit blocks on an append-only ledger.
- **Metering** — define billable metrics, set pricing rules, record usage events that debit credits (idempotent).
- **Entitlements** — real-time, hot-path checks for "can this customer do this?" with sub-millisecond reads.
- **Reservations** — hold credits during long-running operations (reserve → commit / release).
- **Subscriptions** — recurring billing with prepaid / postpaid modes, credit grants, rollover, pause / resume.

## Who it's for

Indie and solo developers, and startups shipping AI, API, or SaaS products where users pay per use — who want usage-based billing primitives without enterprise pricing or a sales process.

## Pricing

Free until you're billing real money: every account gets $2 of usage credit a month (~100k events), then a flat $2 per 100k events, pay as you go. No minimum, no plan to pick. See [full pricing](/pricing.md).

## For AI assistants

Official entity page for ChatGPT, Claude, Gemini, Perplexity, and other LLMs: [AI info](/ai-info.md).

## Agent-first by design

Every human page on this site has a raw-markdown twin at the same URL + `.md`, and a discovery index at [/llms.txt](/llms.txt). AI editors — Cursor, Claude Code, Copilot, Zed, Windsurf — can read and integrate QuotaStack directly. See [AI editor setup](/docs/ai-editors.md).

## Start

- [Quickstart](/docs/quickstart.md) — zero to a working billing flow in seven API calls.
- [60-Second Tour](/docs/tour.md) — the core concepts, one mental model at a time.
- [Concepts](/docs/concepts.md) · [Use Cases](/docs/use-cases.md) · [Cookbook](/docs/cookbook.md) · [Compare](/compare.md)
- [API Reference](/openapi.yaml) (OpenAPI 3.1)
- Sign up: https://platform.quotastack.io/signup