Payments
Scalable, Private Payments
INTMAX enables developers to build high-throughput, privacy-preserving payment systems without the typical tradeoffs of rollups or L1 constraints. Whether you're building a wallet, a merchant gateway, or peer-to-peer payment apps, INTMAX offers a unique stateless architecture ideal for scaling financial interactions.
What You Can Build
- Retail & E-commerce checkout
- Crypto-native payroll
- Micropayments for content or streaming
- Cross-border settlement rails
- Wallet-to-wallet transfers with full unlinkability
How It Works
1. User Deposit (L1 → L2)
- Users deposit ETH or tokens to the rollup contract, specifying their L2 public key.
2. Off-chain Payment
- Users generate a transaction batch (e.g. “send 5 USDC to Bob”) and share a salted hash with an aggregator.
- Aggregators build Merkle trees and submit signed roots to the contract.
- Transaction data is sent directly and privately to the recipient, along with a ZK-proof of validity.
3. Withdrawal (L2 → L1)
- Users can exit at any time by proving—via ZK—that they received a certain balance.
Developer Benefits
| Feature | Benefit |
|---|---|
| Stateless Protocol | No need to sync or manage global rollup state |
| Privacy-by-default | No on-chain sender/recipient/amount data |
| Low On-chain Overhead | ~5 bytes onchain; unlimited recipients per batch |
| Easy Aggregation | Any app or user can act as an aggregator; no sequencer dependency |
| Future-Proof Scaling | Compatible with EIP-4844 and other L1 throughput upgrades |
Integration Tips
- Use the INTMAX SDK to:
- Generate deposit transactions
- Construct and hash payment batches
- Interact with aggregators
- Create/verify zero-knowledge proofs
- Use relayer contracts for guaranteed timing and replay protection if your app handles batching.
Example Apps
| Project Idea | Description |
|---|---|
| Venmo for Crypto | Wallet-to-wallet instant transfers with no on-chain trace |
| Subscription Manager | Periodic payments with local state and ZK receipt tracking |
| Local Merchant Toolkit | POS app using INTMAX for gasless, instant retail checkout |
Key Takeaway
INTMAX lets you build Ethereum-native payments that feel more like Web2: instant, private, cheap—and user-controlled. No gas fatigue, no address leaks, no sequencer trust.