Owostack

Owostack is a billing infrastructure for subscriptions, usage, and entitlements. You connect a payment provider, model plans and features, and use three API primitives to enforce access and track usage: attach, check, and track.

What you build with Owostack

Subscription lifecycle without bespoke webhook code
Entitlements that gate features by plan
Usage metering for API calls, credits, or quotas
Plan switching with upgrades, downgrades, and add-ons

Core primitives

import { Owostack } from "@owostack/core";

const owo = new Owostack({ secretKey: process.env.OWOSTACK_SECRET_KEY });

await owo.attach({
  customer: "user_123",
  product: "pro-monthly",
});

const access = await owo.check({
  customer: "user_123",
  feature: "api_calls",
});

await owo.track({
  customer: "user_123",
  feature: "api_calls",
  value: 1,
});

How it works

Provider Checkout -> Provider Webhooks -> Owostack
                                   |
                                   v
                         Entitlements + Meters
                                   |
                                   v
                          Your app (SDK)

Owostack receives provider webhooks, normalizes events, and keeps subscription state, entitlements, and usage meters in sync. Your app just checks and tracks.

Zap

Quickstart

Webhook

Webhook Setup

Workflow

How It Works

Supported billing models

Model	Status
Flat-rate subscriptions	✅ Supported
Usage-based (metered)	✅ Supported
Credits / prepaid	✅ Supported
Trials & freemium	✅ Supported
Per-seat pricing	🔜 Planned

Introduction