SmashPay – Web3 Wallet & Payment Platform

Crypto wallets talk to crypto. Banks talk to banks. Payment apps talk to payment apps. If you want to move money across all three, you're juggling multiple tools, multiple logins, and multiple headaches.

SmashPay was built to collapse that into one interface.

SmashPay is a unified wallet and payment infrastructure platform that bridges traditional finance and the Web3 ecosystem. Users, merchants, and digital platforms can send, receive, manage, and process payments across both fiat and crypto networks from a single dashboard.

The goal wasn't to build another crypto wallet or another payment gateway. It was to build the layer that sits between both worlds and makes them feel like one.

The hardest part of this project was designing an architecture that could handle two fundamentally different financial systems through one unified experience. Fiat transactions follow bank rails with settlement delays, compliance requirements, and regional payment providers. Crypto transactions hit blockchains with gas fees, confirmation times, and wallet signatures.

These systems have different latency profiles, different failure modes, and different security models. SmashPay needed to abstract all of that complexity away so the user just sees "send money" and "receive money," regardless of whether it's USD or ETH moving underneath.

Unified wallet dashboard – One interface for managing fiat and crypto balances, viewing transaction history, and initiating transfers. Users don't need to context-switch between apps to see their full financial picture.

Cross-border crypto transfers – Send and receive crypto across networks without needing to manually manage wallet addresses, gas estimation, or network selection for every transaction.

Merchant payment infrastructure – Backend structure for businesses to accept digital payments, with transaction tracking, settlement workflows, and webhook-based confirmation.

Secure authentication and access control – User account management with role-based permissions, session handling, and security layers appropriate for a financial platform.

Scalable API architecture – Modular backend with separate services for wallet operations, transaction processing, user management, and payment workflows. Each module can scale independently as usage grows.

Integration-ready structure – Built with clear extension points for third-party APIs, blockchain services, and financial tools. The architecture supports future additions like decentralized lending, staking, advanced merchant dashboards, and platform-based financial automation.

Frontend: Next.js, React, TypeScript, Tailwind CSS

Backend: Node.js, Express.js, REST APIs

Database: MongoDB

Web3/Finance: Crypto payment workflows, wallet infrastructure, blockchain integration-ready architecture

SmashPay targets fintech startups, digital platforms, and merchants who need a unified payment layer that works across traditional and decentralized finance. The architecture is designed to grow: new payment rails, blockchain networks, or financial products can plug in without rearchitecting the core system.