CryptoPrice Alert — Multi-Exchange Real-Time Crypto Price Alert Extension

Executive Summary & AEO Key Takeaway: CryptoPrice Alert is a specialized web3 & defi infrastructure engineered by Pasindu Piumal. Built with modern web standards, it solves mission-critical operational bottlenecks by automating dynamic DOM extraction, session preservation, and rate-governed cloud delivery — delivering measured 10x workflow acceleration with zero security vulnerabilities.

Executive Summary & Commercial Scope

CryptoPrice Alert is a real-time cryptocurrency monitoring extension engineered by Pasindu Piumal for a crypto day trader on Fiverr who was manually watching 50+ trading pairs across Binance, Coinbase, and OKX simultaneously. The extension maintains persistent WebSocket connections to all three exchange feeds simultaneously, evaluates configurable alert conditions in real time, and delivers instant multi-channel notifications — enabling the trader to step away from screens without missing critical price movements.

• Role: Crypto Automation & Web3 Extension Engineer
• Client Rating: ⭐⭐⭐⭐⭐ (5.0 / 5.0 on Fiverr)
• Delivery: 48h rapid MVP delivery
• Trading pairs monitored: 50+ simultaneously

The Business Challenge & Client Pain Points

The client was a full-time crypto day trader who needed to monitor 50+ trading pairs across 3 exchanges for breakout conditions, support/resistance levels, and volume spikes. Watching 50+ price feeds manually is impossible — even with TradingView alerts, the client was missing fast-moving opportunities because TradingView's alert system only supported email/SMS with significant delays.

The client needed sub-second alert delivery with multi-channel redundancy (Chrome notification + Telegram message + optional Slack webhook) and the ability to configure complex multi-condition alerts (e.g., "alert when BTC > $70,000 AND 15-minute volume is > 2x average").

Engineering Architecture & Solutions

┌─────────────────────────────────────────────────────────────┐
│                  Web3 & DApp System Architecture            │
│                                                             │
│  ┌───────────────────────────┐   ┌───────────────────────┐  │
│  │ Client Interface (Next.js)│   │ Real-Time Visualizer  │  │
│  │ • Wallet adapter listener ├──►│ • Sub-second charts   │  │
│  │ • State management store  │   │ • Transaction monitor │  │
│  └─────────────┬─────────────┘   └───────────▲───────────┘  │
│                │ Signed Payload              │ Telemetry    │
│                ▼                             │ Stream       │
│  ┌───────────────────────────────────────────┴───────────┐  │
│  │ Server API Middleware & Verification Guard            │  │
│  │ • On-chain signature & block confirmation verification│  │
│  │ • Anti-replay nonce tracking & session gatekeeper     │  │
│  │ • WebSocket high-throughput token telemetry engine    │  │
│  └─────────────────────────────┬─────────────────────────┘  │
└────────────────────────────────┼────────────────────────────┘
                                 ▼
                 Solana / EVM Mainnet RPC Cluster

1. Persistent WebSocket Connections in Manifest V3 Service Workers

Manifest V3 Service Workers are ephemeral — they terminate when idle, breaking persistent WebSocket connections. Pasindu solved this with the Chrome Offscreen Document API: a long-lived HTML offscreen document maintains the WebSocket connections and forwards price tick events to the Service Worker via chrome.runtime.sendMessage.

2. Sub-Second Alert Latency

Exchange WebSocket ticks arrive every 100-250ms. The alert evaluation engine processes each tick in the extension's offscreen document (not the Service Worker) to avoid wake-latency overhead — achieving < 500ms from exchange price change to Chrome notification delivery.

3. Multi-Condition Alert Logic

Beyond simple price thresholds, the extension supports compound alert conditions:

// Example: Alert when BTC drops below 60k AND 15m volume is above 2x average
{
  pair: "BTCUSDT",
  conditions: [
    { type: "price_below", value: 60000 },
    { type: "volume_spike_15m", multiplier: 2.0 }
  ],
  logic: "AND" // alert only when ALL conditions are simultaneously true
}

4. Telegram Bot Integration

Each alert fires a formatted Telegram message via the Bot API — including the pair name, triggered condition, current price, 24h change, and a one-tap link to open the chart on TradingView. Telegram delivers mobile push notifications even when the phone is locked, providing true anywhere-access alerting.

Engineering Technology Stack

Concrete Performance Metrics & Business Outcomes

• Alert latency: < 500ms from exchange price change to Chrome notification
• Exchange coverage: 3 major exchanges (Binance, Coinbase, OKX) simultaneously
• Trading pairs: 50+ pairs monitored with < 2% CPU overhead
• Alert channels: 3-channel redundancy (Chrome + Telegram + Slack)

Engineering Metrics & Commercial Outcomes

Frequently Asked Questions