✦ Built for Modern SaaS

Build a SaaS
With the Right Monetization Model

Launch fast with quota subscriptions, unlimited plans, credits, and lifetime purchases — all built on reliable monetization infrastructure.

The hardest payment work is already handled. Launch price: $299 → $199

See It in Action

When billing goes wrong

Subscriptions, upgrades, downgrades, cancellations, credits — these don't break individually.

They break when money starts moving between them.

if (sub.status === "past_due")credits -= amount // NEGATIVE?!} catch (e) { /* ??? */ }// this breaks on renewalthrow new Error("impossible state")// TODO: handle downgraderefund(partial ? pro_rata : full)webhook.retry(3) // maybe?// FIXME: race condition hereelse if (trial && !expired)if (plan !== prev_plan)quota = expired ? 0 : quota⚠️❌⚠️🔴❌
Credits go negative
Wrong amount on next invoice
Active and Expired — at the same time

A unified monetization system for SaaS

From simple subscriptions to complex credit-based pricing — everything works together by design.

Pay4SaaS Dashboard

Handles real billing scenarios:

Upgrades & downgrades

with correct billing transitions

Cancellation & resume

with consistent state

Trial → active subscription

complete lifecycle

Credits, usage & billing

always stay in sync

A credit system that actually works

1st

Subscription credits

Resets every billing cycle

2nd

Bonus credits

Expires in batches

3rd

Purchased credits

Never expires

Deterministic deduction order — predictable, no surprises.

Access control stays independent from billing

Features unlocked by plan

One function checks the user's plan. Access granted or denied — that's it.

PlanBasic featuresPro featuresPriority support
Free✓——
Pro✓✓—
Max✓✓✓

Usage charged by credits

You define which actions cost credits. One function call — atomic deduction, done.

UsageCost
AI Generate5 credits
Export PDF2 credits
API Call1 credit

No hidden coupling between permissions and billing logic.

4 ways to charge your users

One environment variable to switch. Pricing page, checkout, access control — all adapt automatically.

Quota Subscription + Credits pricing page

Quota Subscription + Credits

subscription_quota

Subscription includes monthly quota. Buy extra credits when needed.

→ Great for products with base usage + elastic demand

Unlimited Subscription pricing page

Unlimited Subscription

subscription_unlimited

Monthly/yearly billing with unlimited usage. Supports free trials.

→ Great for high-frequency, low-cost services like Grammarly

Credits pricing page

Credits

credits

Pay as you go. Buy what you need.

→ Great for API services and AI products like Claude Code

Lifetime pricing page

Lifetime

lifetime

Pay once, use forever.

→ Great for code products like Tailwind CSS, Pay4SaaS

PayPal$29.99

Hello, John Doe!

Payment methodChange ›
VISA
Visa x-92
Cancel
TermsPrivacy

Unlimited Plan

By Pay4SaaS

$79.99 /mo

john@example.com
4242 •••• •••• 4242
VISA

Powered by creem

Subscribe to Pro Plan

US$29.99 /month

john@example.com
4242 •••• •••• 4242
VISA

Powered by stripe

Works with Stripe, Creem, and PayPal

Switch providers with one env variable. Your business logic doesn't change.

Works for

If your users pay to use it, Pay4SaaS handles the rest.

AI Products

Writing assistants, image generators, chatbots

·const res = await useService("ai-gen")
·if (balance.availableCredits < cost)
›→ { success, remainingCredits: 42 }

API Services

Translation APIs, data enrichment, webhooks

·SERVICE_COSTS["api-call"] = 5
·await useService("api-call")
›→ { remaining: 847 }

Dev Tools

CI/CD platforms, code analysis, testing suites

·const canUse = useTierAccess("pro")
·if (!canUse) redirect("/pricing")
›→ feature unlocked ✓

Content Platforms

Course sites, newsletters, gated communities

·const { status } = useAccess()
·status.details.hasActiveSubscription
›→ unlock module 3

Data & Analytics

Dashboards, reports, real-time monitoring

·await grantBonus("hero_welcome_bonus")
·await useService("query")
›→ { remainingCredits: 38 }

Everything stays in sync — across subscriptions, credits, and billing.

That's the hard part. And it's already handled.

One-time pricing

Email + password, Google & GitHub OAuth via Supabase
Stripe, Creem, PayPal payments with webhook verification
4 pricing models, switch with one environment variable
Full subscription lifecycle with 30+ edge cases handled
Three-tier credits system with atomic deduction
Multi-tenant support, one database for multiple projects
Vercel & Alibaba Cloud deployment, dual-domain EN/CN auto-adaptive, multi-currency
Twitter (@taoWithSaaS) & WeChat, direct author support
Lifetime free updates via GitHub repo
$299$199

One purchase. Lifetime access.

FAQ

I was a React beginner myself before building Pay4SaaS. The entire project was built with AI assistance. Just describe what you need — Claude Code handles the code.
You'll receive a GitHub organization invite after payment. Just clone and start building.
Yes. No project limits. Buy once, use everywhere.
As a digital product, no refunds are available once the GitHub repository invitation has been successfully sent. A successful invitation is considered product delivered, and the system logs the GitHub username you provided. Questions before buying? Reach me on @taoWithSaaS or email:

Build your SaaS — and leave the rest behind.

Ship features. Talk to users. Grow your product.

Subscriptions, credits, and billing run quietly in the background — always in sync.

Your product grows. Your revenue flows. And nothing breaks in between.

pay4saas · backgroundlive
2s ago
Subscription renewed
14s ago
Credits deducted · 5 credits
1m ago
Billing synced
3m ago
Access granted · Pro Plan
8m ago
Webhook delivered

You can always start later —
but the price won't wait.

Plug in your product. Start charging.