The Qubitron Labs Crypto Wallet SDK is a reusable React and Next.js package engineered to help developers integrate wallet functionality into Web3 applications without rebuilding complex transaction interfaces and state management systems from scratch.

Published as a TypeScript npm package, the SDK provides pre-built components, hooks, services, configuration APIs, and state synchronization systems for crypto deposits, token swaps, withdrawals, wallet authentication, and real-time transaction updates.

The core engineering challenge was package portability. A reusable Web3 SDK must operate across different host applications without creating CSS conflicts, tightly coupling business logic to individual projects, or requiring developers to rebuild wallet infrastructure for every implementation.

The Challenge

Building wallet functionality directly inside individual applications creates repeated engineering work.

Deposit interfaces, token swaps, withdrawals, authentication, network management, transaction states, API communication, WebSocket updates, and blockchain interactions often require separate implementations across multiple products.

A reusable SDK needed to solve these problems while remaining configurable and maintainable across different host environments.

The architecture required:

• Reusable wallet components
• Developer-facing hooks
• Runtime configuration
• Authentication integration
• Blockchain state management
• Real-time transaction synchronization
• API and WebSocket services
• Isolated component styling
• Type-safe interfaces
• Support for multiple EVM networks

The Engineering Approach

The SDK was engineered as a modular TypeScript package with clear separation between UI components, React hooks, application state, blockchain services, configuration, and utility layers.

React provides the component architecture, while TypeScript maintains type safety across public APIs and internal modules.

Zustand manages shared application state for tokens, transactions, and blockchain networks.

The package integrates with Dynamic for authentication and wallet connectivity, while Wagmi and Viem provide supporting EVM network infrastructure.

WebSocket services synchronize transaction and application states in real time.

Modular SDK Architecture

The package architecture separates functionality into multiple layers:

• UI components
• React hooks
• State management
• API services
• WebSocket services
• Transaction services
• Authentication providers
• State synchronizers
• Runtime configuration
• Type definitions
• Blockchain utilities

This structure allows wallet features to remain reusable while providing developers with access to lower-level hooks and services for custom implementations.

Crypto Deposit Infrastructure

The SDK provides reusable components and hooks for handling crypto deposit workflows.

The deposit architecture includes functionality for:

• Token selection
• Network selection
• Wallet address handling
• Deposit calculations
• Transaction states
• Gas management
• Pending transaction interfaces
• QR code-based deposits
• Transaction feedback

Developers can use pre-built deposit interfaces or access individual hooks to build custom experiences.

Token Swap System

The package includes a modular token swap architecture.

Swap functionality is separated across hooks responsible for:

• Swap form state
• Token allowances
• Gas management
• Quote retrieval
• Token pricing
• Transaction execution

This separation provides greater control over swap interfaces while keeping blockchain interaction logic reusable across applications.

Crypto Withdrawal Workflows

The withdrawal architecture provides components and hooks for managing crypto withdrawal operations.

The SDK handles:

• Network validation
• Withdrawal calculations
• Form state
• Transaction execution
• Pending transaction states
• Success feedback

The modular structure enables developers to integrate complete withdrawal interfaces or build custom workflows using the underlying hooks.

Wallet Authentication

The SDK integrates with Dynamic for wallet authentication and user management.

An authentication provider synchronizes connected wallet information and exposes user and authentication states throughout the host application.

The wallet infrastructure connects with Wagmi and Viem to support EVM network interactions.

Real-Time WebSocket Synchronization

WebSocket infrastructure provides real-time synchronization for transaction and application data.

Dedicated synchronizers manage:

• Network state
• Token state
• Transaction state
• WebSocket state

Feature flags allow applications to enable or disable individual synchronization systems through runtime configuration.

Runtime SDK Configuration

The SDK provides a configuration API that enables developers to define application-specific infrastructure without modifying package internals.

Configuration options include:

• API endpoints
• API authentication
• WebSocket endpoints
• Network IDs
• Smart contract addresses
• Custom contract ABIs
• Withdrawal functions
• Feature flags
• Logout behavior

This architecture allows the same package to operate across different Web3 products and infrastructure environments.

Isolated Styling Architecture

One of the core challenges of reusable frontend packages is preventing conflicts between SDK components and host application styles.

The package was engineered with isolated styling behavior so wallet interfaces can be integrated into different frontend environments without requiring application-specific styling configuration.

Styles are bundled with the package, reducing additional setup requirements for developers integrating the SDK.

Reusable React Components

The SDK provides pre-built interface components for common Web3 workflows, including:

• Deposit panels
• Token swap interfaces
• Withdrawal panels
• Transaction modals
• Wallet information panels
• Network selectors
• Token selection interfaces
• Profile information
• Transaction feedback
• Toast notifications
• Tip workflows

These components provide ready-to-integrate wallet functionality while the underlying hooks remain available for custom implementations.

Developer-Focused React Hooks

The package exposes hooks across authentication, deposits, swaps, withdrawals, tokens, wallet addresses, transactions, and blockchain utilities.

This enables development teams to use the SDK at different abstraction levels.

Projects can integrate complete UI components for faster implementation or use individual hooks and services when custom interfaces and transaction flows are required.

Multi-Chain Infrastructure

The SDK architecture supports multiple EVM-compatible blockchain networks.

The documented configuration includes Ethereum, Polygon, Arbitrum, Optimism, Base, Avalanche, BNB Smart Chain, Linea, and zkSync.

This provides a reusable infrastructure layer for Web3 applications operating across different blockchain ecosystems.

Technology Stack

React, Next.js, TypeScript, Web3, Dynamic, Wagmi, Viem, Zustand, Socket.IO, WebSockets, EVM Networks, npm Package Architecture

Outcome

The project resulted in a reusable crypto wallet SDK that packages Web3 transaction interfaces, wallet authentication, blockchain state management, real-time synchronization, API communication, and developer-facing hooks into a modular TypeScript architecture.

The SDK reduces repeated wallet implementation work across React and Next.js applications by providing configurable infrastructure for deposits, token swaps, withdrawals, transaction states, network management, and wallet interactions.

Published as the @qubitronlabs/crypto-wallet npm package, the project demonstrates Qubitron Labs' capability in Web3 SDK architecture, reusable frontend systems, blockchain integrations, and developer-focused product engineering.