⚡ Built on Solana · Anchor 0.32

Stripe.
Rebuilt On-Chain.

Production-grade SaaS billing with zero databases, zero payment processors, and zero trust assumptions. Subscriptions as PDAs. Payments as immutable audit logs.

GitHub →
⚡ ~15K CU per instruction
💸 ~$0.001 per transaction
🚫 No Middlemen
🔒 Trustless · Permissionless
How it works
Three steps. Fully on-chain.
No backend. No database. Just Solana PDAs and cryptographic guarantees.
1

Connect Wallet

Connect your Phantom wallet. Your public key becomes your identity — no accounts, no passwords, no email required.

2

Choose a Plan

Plans are stored as Program Derived Addresses on Solana. Price, period, and capacity are enforced by smart contract — immutable once set.

3

Subscribe On-Chain

One atomic transaction transfers SOL and creates your Subscription PDA. Every payment is an immutable PaymentRecord — a permanent, auditable on-chain receipt.

Comparison
Web2 Stripe vs On-Chain BillChain
Why rebuild billing on Solana? Here's exactly what you gain — and what you trade off.
Dimension
❌ Stripe (Web2)
✅ BillChain (On-Chain)
Trust Model
Stripe TOS, bank risk, centralized
Trustless — code is law
Transaction Fee
2.9% + $0.30 per payment
~$0.001 flat, always
Censorship
Account can be frozen anytime
Permissionless — no one can stop you
Audit Trail
Stripe dashboard (their data)
On-chain PaymentRecord PDAs, forever
Composability
REST API, webhooks
Direct CPI from any Solana program
Downtime Risk
Stripe outages affect your revenue
Solana 99.9% uptime, no single point
PCI Compliance
Required ($$$)
Not applicable — no card data
Subscription Plans
Live on Solana Devnet
These plans are loaded directly from the blockchain. No API. No cache.
Loading plans from blockchain...
Architecture
4-Level PDA Hierarchy
Each account is a Program Derived Address — deterministically findable, perfectly isolated, and zero-collision by design.
ServiceRegistry
seeds: ["registry", authority]
├── SubscriptionPlan[0]
seeds: ["plan", registry, plan_id_u64_le]
│ └── Subscription[subscriber]
seeds: ["subscription", plan, subscriber]
│ ├── PaymentRecord[0] ← immutable audit log
│ └── PaymentRecord[n]
└── SubscriptionPlan[1] ...