NexusPay

Screenshots

Problem Statement

Nexus Pay: Revolutionizing Cross-Chain Payments with NFC Wallet TechnologyOverview: Nexus Pay is a cutting-edge payment infrastructure that combines physical NFC wallet technology with cross-chain transfer capabilities to create a seamless, debit card-like experience for crypto payments. By integrating Arx Research's Halo chip (a secure NFC-enabled hardware wallet) with Circle's Cross-Chain Transfer Protocol (CCTP), we enable instant, secure USDC payments across multiple blockchain networks.Technical Architecture:Physical Layer - Halo Chip Integration: • Secure NFC hardware wallet provided by Arx Research • Standalone wallet functionality without requiring a smartphone • Tamper-proof private key storage • Tap-to-pay experience similar to traditional payment cardsNetwork Infrastructure: • Primary Networks:Ethereum (Layer 1)Arbitrum (Layer 2)Base (Layer 2)[Other supported L2 networks] • CCTP Integration:Message attestation for cross-chain transfersBurning and minting of USDC across chainsAutomated message passing and verificationPayment Flow: a. Customer Experience: • Tap Halo chip at merchant terminal • Payment automatically processed on optimal L2 network • Real-time confirmation via Push Protocol notifications • No gas fees for end users on supported L2sb. Merchant Side: • Receives USDC on their preferred network • Instant payment confirmation • Automated cross-chain settlement • Real-time transaction monitoringSmart Contract Architecture: • TokenMessenger Contracts:Handle USDC burning and mintingMessage transmission between chains • MessageTransmitter Contracts:Verify attestationsProcess cross-chain messages • Payment Router Contracts:Optimize gas costsHandle transaction routingNotification System: • Push Protocol integration for:Real-time payment notificationsTransaction status updatesSettlement confirmationsWallet balance alertsKey Technical Features:Security: • Hardware-level security via Halo chip • Cryptographic signing of transactions • Secure key storage and management • Multi-layer authenticationCross-Chain Operations: • Seamless USDC transfers between chains • Optimized gas costs using L2 networks • Automated chain selection based on:Gas pricesNetwork congestionUser preferencesMerchant Integration: • Simple API for business integration • Customizable payment flows • Detailed transaction reporting • Multi-chain treasury managementReal-time Processing: • Instant payment confirmations • Automated cross-chain settlements • Push notifications for all parties • Transaction status trackingBenefits:For Users: • Familiar tap-to-pay experience • No need for mobile apps or hot wallets • Reduced transaction costs • Instant payment confirmationFor Merchants: • Accept payments from any supported chain • Receive funds on preferred network • Lower processing fees • Real-time settlement • Simplified accountingFor the Ecosystem: • Increased USDC utility • Better L2 adoption • Improved payment UX • Bridge between traditional and crypto paymentsTechnical Implementation:Frontend: React.js with TypeScriptSmart Contracts: SolidityNotification System: Push ProtocolCross-Chain: Circle CCTPHardware: Arx Research Halo ChipAPIs: REST/GraphQLSecurity Considerations:Hardware-level security via Halo chipSecure key managementMulti-signature supportRate limitingTransaction monitoringFraud detection systemsFuture Roadmap:Additional network integrationsAdvanced merchant toolsFiat on/off rampsMobile app companionAdvanced analytics dashboardMulti-token support

Solution

Nexus Pay: Revolutionizing Cross-Chain Payments with NFC Wallet TechnologyOverview: Nexus Pay is a cutting-edge payment infrastructure that combines physical NFC wallet technology with cross-chain transfer capabilities to create a seamless, debit card-like experience for crypto payments. By integrating Arx Research's Halo chip (a secure NFC-enabled hardware wallet) with Circle's Cross-Chain Transfer Protocol (CCTP), we enable instant, secure USDC payments across multiple blockchain networks.Technical Architecture:Physical Layer - Halo Chip Integration: • Secure NFC hardware wallet provided by Arx Research • Standalone wallet functionality without requiring a smartphone • Tamper-proof private key storage • Tap-to-pay experience similar to traditional payment cardsNetwork Infrastructure: • Primary Networks:Ethereum (Layer 1)Arbitrum (Layer 2)Base (Layer 2)[Other supported L2 networks] • CCTP Integration:Message attestation for cross-chain transfersBurning and minting of USDC across chainsAutomated message passing and verificationPayment Flow: a. Customer Experience: • Tap Halo chip at merchant terminal • Payment automatically processed on optimal L2 network • Real-time confirmation via Push Protocol notifications • No gas fees for end users on supported L2sb. Merchant Side: • Receives USDC on their preferred network • Instant payment confirmation • Automated cross-chain settlement • Real-time transaction monitoringSmart Contract Architecture: • TokenMessenger Contracts:Handle USDC burning and mintingMessage transmission between chains • MessageTransmitter Contracts:Verify attestationsProcess cross-chain messages • Payment Router Contracts:Optimize gas costsHandle transaction routingNotification System: • Push Protocol integration for:Real-time payment notificationsTransaction status updatesSettlement confirmationsWallet balance alertsKey Technical Features:Security: • Hardware-level security via Halo chip • Cryptographic signing of transactions • Secure key storage and management • Multi-layer authenticationCross-Chain Operations: • Seamless USDC transfers between chains • Optimized gas costs using L2 networks • Automated chain selection based on:Gas pricesNetwork congestionUser preferencesMerchant Integration: • Simple API for business integration • Customizable payment flows • Detailed transaction reporting • Multi-chain treasury managementReal-time Processing: • Instant payment confirmations • Automated cross-chain settlements • Push notifications for all parties • Transaction status trackingBenefits:For Users: • Familiar tap-to-pay experience • No need for mobile apps or hot wallets • Reduced transaction costs • Instant payment confirmationFor Merchants: • Accept payments from any supported chain • Receive funds on preferred network • Lower processing fees • Real-time settlement • Simplified accountingFor the Ecosystem: • Increased USDC utility • Better L2 adoption • Improved payment UX • Bridge between traditional and crypto paymentsTechnical Implementation:Frontend: React.js with TypeScriptSmart Contracts: SolidityNotification System: Push ProtocolCross-Chain: Circle CCTPHardware: Arx Research Halo ChipAPIs: REST/GraphQLSecurity Considerations:Hardware-level security via Halo chipSecure key managementMulti-signature supportRate limitingTransaction monitoringFraud detection systemsFuture Roadmap:Additional network integrationsAdvanced merchant toolsFiat on/off rampsMobile app companionAdvanced analytics dashboardMulti-token support