High-Performance
Cryptocurrency Market Analytics
Client-side, offline-first, zero-dependency dashboard for monitoring 450+ USDT markets. Mathematical correctness with zero magic.
The K% Indicator
Position within the 24-hour range, normalized to 0-100%. Pure math, no interpretation.
K% =
(
price
-
low24h
) / (
high24h
-
low24h
) × 100
No signals, no interpretation. K% simply shows where the current price sits within today's range. A K% of 65% means the price is 65% of the way from the daily low to the daily high. What you do with this information is your decision.
Built for Speed
Every optimization is measurable. No premature abstractions, no framework overhead.
Throttled table updates prevent UI thrashing during high-frequency WebSocket events
450 symbols × 38 columns of real-time data updated via WebSocket streams
In-place object mutation with keyed references. No GC pressure from allocations
Offline-first architecture with persistent local storage for historical klines
Single multiplexed WebSocket connection for all 450+ symbol streams
Zero external dependencies. Pure vanilla JavaScript with no build step required
Why These Numbers Matter
Every spec above is a deliberate engineering choice. The 200ms throttle prevents the DOM from thrashing during periods of high market volatility. Zero memory growth means you can leave the dashboard running for days without browser slowdown. A single WebSocket connection reduces server load and simplifies reconnection logic. These aren't marketing numbers—they're implementation details.
Know Your Data Sources
Every data point is traceable. No black boxes, no hidden APIs, no data manipulation.
Cryptocurrency WebSocket
wss://stream.spoonbots.com:9443
!miniTicker@arr, <symbol>@kline_1h
- - Real-time prices
- - 24h high/low/volume
- - Live kline updates
Offline Klines
IndexedDB (Local)
1h, 4h, 1d, 1w
- - Historical OHLCV
- - Range calculations
- - Trend analysis inputs
CMC / CoinGecko
Market cap rankings
Manual refresh only
- - CMC rank
- - CoinGecko rank
- - Category tags
Data Flow
No intermediate servers. Data flows directly from Cryptocurrency to your browser.
What This Is NOT
Clarity over marketing. We believe you deserve to know exactly what you're getting.
Not a Signal Service
No buy/sell signals, no alerts, no "opportunities detected". We show data, you make decisions.
Not a Trading Bot
No automated trading, no API key access, no order execution. This is a read-only dashboard.
Not Financial Advice
No recommendations, no analysis, no predictions. Raw data for your own research only.
Not a Prediction Tool
No AI forecasts, no pattern recognition magic. Historical data is not predictive of future results.
What It IS
A precision instrument for viewing Cryptocurrency market data. Think of it as a very sophisticated spreadsheet that updates in real-time.
- + Real-time data visualization
- + Mathematical indicators (not interpretations)
- + Offline-capable storage
- + Open source and auditable
Ready to See the Data?
No signup required. No tracking. Just open it and start exploring Cryptocurrency markets.