CrossPay Protocol

Verifiable, private, cross-chain payment infrastructure. Built during Aleph Hackathon.

Overview

CrossPay enables secure payments across multiple chains with privacy preservation (Zama FHE), validator security (Symbiotic), permanent storage (Filecoin), and oracle integration (Flare).

Implementation Status

Core Infrastructure: Payment processing, storage, oracles Advanced Security: Privacy, validation, risk management

• Privacy Layer: Zama FHE encrypted payments with selective disclosure
• Validator Network: Symbiotic consensus with BFT validation
• Risk Management: Multi-tranche vault with slashing protection
• Analytics System: Real-time monitoring and metrics

Quick Start

pnpm install
cd contracts && forge deploy
cd ../app && pnpm dev
docker-compose up # Optional services

Architecture

• Contracts: Core payment logic, privacy (FHE), security (validators), oracles, attestations
• Services: Payment processor (Go), storage worker (Go), relay network (Go), AI copilot (TS)
• Frontend: SvelteKit app with chain-specific routes
• Mini App: Base MiniKit for mobile payments

Network Deployments

Network	Purpose	Features
Symbiotic	Security layer	Relay validators, tranche vault, DVN
Lisk	Main deployment	Core payments, ENS, attestations
Base	Consumer app	Mini app, viral sharing
Zama	Privacy	FHE encryption, selective disclosure
Flare	Oracles	FTSO pricing, FDC proofs, RNG
Filecoin	Storage	Receipt storage via IPFS
AI (Protocol Labs)	AI Services	Copilot, risk scoring, normalization
ENS	Identity	Name resolution, subnames
Citrea	Bitcoin	BTC-denominated escrow

Core Interfaces

interface IPaymentCore {
 function createPayment(address recipient, uint256 amount, bytes32 metadata) returns (uint256);
 function completePayment(uint256 id);
}

interface IConfidentialPayment extends IPaymentCore {
 function createPrivatePayment(address recipient, euint256 amount);
 function grantDisclosure(uint256 id, address viewer);
}

API Endpoints

• POST /api/pay - Process payment
• POST /api/validate - Request validation
• POST /api/storage/upload - Store receipt
• POST /api/ai/risk - Risk scoring

Documentation

• Technical Architecture - Complete system architecture and integration details
• Track Requirements & DoD - Implementation checklist per blockchain

License

MIT