tags: [crypto, trading, react, typescript]
I created a professional cryptocurrency trading terminal for Hyperliquid DEX with a distinctive architecture: fully client-side - no backend servers, no middlemen. Your private keys never leave your browser.
Zero Backend Philosophy
The system eliminates intermediaries entirely. Data flows directly from browser to exchange. This design choice prioritizes user trust, particularly crucial for applications handling sensitive credentials.
Private Key Security
Implementation uses AES-GCM encryption with PBKDF2 key derivation. The system generates a device-specific key on initial use, stored in localStorage, with optional password protection. Even if someone steals the localStorage data, they'd need 100,000 PBKDF2 iterations to crack each guess.
Order Entry Methods
Click-on-Chart Orders
A crosshair system enables intuitive price-level placement. Clicking below current price creates buy limit orders; clicking above creates sell orders.
Cloud Ladder Orders (DCA)
The signature feature places 5 stacked limit orders at volatility-adapted intervals, each with automatic 2% take-profit orders. The price interval is calculated from recent candle heights - the system adapts to current volatility.
Market Scanners
Eight distinct scanner types run real-time analysis:
- Stochastic Scanner with different periods
- Divergence Detection for reversals
- Performance optimization with memoization, debouncing, and virtual scrolling
Advanced Features
- Multi-timeframe analysis with synchronized charts
- Automated trendlines with pivot-based support/resistance
- Inverted mode for short-biased traders
- Multi-monitor support with detachable windows
Key Lessons
- Client-side architectures work when trust matters
- Optimistic updates feel essential in latency-sensitive apps
- Multiple input methods serve diverse workflows
- Real-time analysis demands careful performance optimization
https://jovweb.dev/blog/building-hyperscalper-client-side-trading-terminal
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