🎯 What This Demo Shows
- A script retrieves data from the CoinMarketCap API and stores it on my CDN (hugely reduces API access fees)
- Three responsive cryptocurrency widgets that automatically load the data from my CDN with smart SessionStorage caching:
- Top 10 Cryptocurrencies - Live prices and 24h changes (excluding stablecoins)
- Trending Cryptocurrencies - Most volatile coins by 24h change
- Market Overview - Total market cap, volume, Bitcoin stats, Fear & Greed Index, and ETF price
✅ Currently Working (Real Data)
Fully Functional:
- ✅ All cryptocurrency prices from
https://cdnfiles.silvabokis.org/cryptotest.json - ✅ Market cap & volume calculations
- ✅ Bitcoin dominance & price changes
- ✅ Smart SessionStorage caching (5-minute expiration, allowing for refreshes inside the 24 hour standard update period + instant loading on repeat visits)
- ✅ Error handling with retry functionality
- ✅ Responsive design for all screen sizes
- ✅ Real-time data refresh when cache expires
Data Source:
- Live data: Updates automatically from my CDN
- Performance: Instant loading from cache, only fetches when needed
- Reliability: Graceful fallbacks and error handling
❌ Currently Missing (Simulated/Placeholder)
1. Crypto Logos (85% Impact)
- Status: Letter-based placeholders with brand colors
- What's needed: Logo URLs in API response
- Impact: Reduced visual appeal, but full functionality
2. Fear & Greed Index (10% Impact)
- Status: Shows "Data Unavailable"
- What's needed: API integration
- Impact: One widget section non-functional
3. Bitcoin ETF Price (5% Impact)
- Status: Shows "Unavailable"
- What's needed: Finance API integration
- Impact: Minor - just one data point in overview
🚀 Technical Features (All Working)
Smart Caching System:
- SessionStorage caching - 5-minute expiration
- Instant loading on repeat visits
- Bandwidth efficient - only fetches when needed
- Offline resilience - works with cached data
Performance Optimizations:
- Data preprocessing before caching
- Efficient DOM updates with animations
- Responsive loading states
- Error recovery with retry buttons
What Works Now:
- ✅ All three widgets load and display real cryptocurrency data
- ✅ Smart caching provides instant loading
- ✅ Responsive on all devices
- ✅ Error handling and recovery
What's Missing:
- 🔲 Crypto logos (visual enhancement)
- 🔲 Fear & Greed index (additional API call)
- 🔲 Bitcoin ETF price (additional API call)