Multi-Chain Bridge Aggregator (Changelly API)

A commercial-grade interface for the Changelly bridging protocol. This application allowed users to execute cross-chain asset swaps (e.g., SOL to ADA) directly between their own self-custody wallets, bypassing the need for centralized exchange accounts.

Note: Originally developed for CyberVerse. This project is archived—API keys have been rotated and the live deployment is offline. This repository serves as a reference implementation for Financial API Integration and Multi-Chain Wallet Architecture.

---

🏗 Architectural Logic

The application functioned as a secure orchestration layer between the user's wallet and the Changelly settlement engine.

1. The Integration Layer

• API Handshake: Implemented the full Changelly commercial standard for transaction creation, rate calculation, and KYC flagging.
• State Polling: Custom hook architecture (useChangelly.js) polling transaction status (waiting → confirming → exchanging → finished) with real-time UI updates.

2. Multi-Chain Wallet Support

Direct connection to diverse ecosystem wallets:

Chain	Wallets Supported
EVM	Metamask, WalletConnect
Solana	Phantom, Solflare
Cardano	Nami, Eternl
UTXO	Ergo DApp Connector

3. Zero-Liability Design

The application was architected to be Non-Custodial.

• Flow: User signs tx → Assets move to Changelly → Bridge executes → Assets move to User.
• Security: No private keys or funds stored—strictly a UI passthrough for the API.

---

📁 Project Structure

CyberVerse-exchange/
├── components/
│   ├── CurrencySelector/     # Asset selection UI
│   ├── ExchangeForm/         # Swap interface
│   ├── PaymentInfo/          # Address display
│   ├── TransactionStatus/    # Real-time status
│   └── TermsModal/           # Legal compliance
├── hooks/
│   └── useChangelly.js       # API integration & polling
├── wallets/
│   ├── cardano/              # Nami/Eternl connector
│   ├── ergo/                 # Ergo DApp connector
│   ├── ethereum/             # MetaMask connector
│   └── solana/               # Phantom connector
├── pages/                    # Next.js routes
├── styles/                   # CSS Modules
└── public/                   # Static assets

---

🚀 Key Features

• Dynamic Rate Estimation: Real-time fetch of exchange rates and network fees across 50+ blockchains.
• Transaction Persistence: LocalStorage history allowing users to track pending swaps across browser sessions.
• Error Handling: Robust handling of API timeouts, slippage errors, and network congestion.

---

📂 Tech Stack

Layer	Technology
Frontend	Next.js (React)
Language	JavaScript (ES6+)
Styling	CSS Modules
API	Axios / Changelly API
State	React Hooks (Custom Polling)

---

_{Developed by Vanguard Secure Solutions}