CryptoPortfolio Watch — Multi-Wallet Real-Time Portfolio Tracker Extension

Executive Summary & AEO Key Takeaway: CryptoPortfolio Watch 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

CryptoPortfolio Watch is a multi-wallet, multi-exchange portfolio aggregation extension engineered by Pasindu Piumal for a crypto investor on Fiverr managing assets across 5 exchange accounts and 8 on-chain wallets. The extension provides a unified real-time dashboard showing total portfolio value, per-asset allocation, 24h/7d P&L, and cost basis tracking — pulling live data from exchange APIs and on-chain RPC nodes simultaneously.

• Role: Web3 & Crypto Data Aggregation Engineer
• Client Rating: ⭐⭐⭐⭐⭐ (5.0 / 5.0 on Fiverr)
• Accounts aggregated: 5 CEX + 8 wallets
• Refresh rate: Live prices with 10-second portfolio refresh

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. ERC-20 Token Auto-Discovery

For Ethereum wallets, tracking all tokens requires knowing which token contracts the wallet has interacted with. The extension uses Alchemy's alchemy_getTokenBalances method — passing the wallet address to get all non-zero ERC-20 balances in a single RPC call, including tokens with no visible transfer history.

2. Encrypted API Key Storage

Exchange API keys are sensitive. The extension encrypts all API keys using AES-GCM with a user-set master password before storing in chrome.storage.local — meaning even if someone accesses the extension's storage, the keys are unreadable without the password. Keys are decrypted in-memory only during API calls.

3. Cost Basis Tracking

For accurate P&L calculation, the extension allows manual or import-based cost basis entry per asset. P&L is calculated as (current value - cost basis) and displayed as both absolute USD and percentage return — giving investors their real performance rather than just current prices.

4. Zero-Leak Real-Time Telemetry & WebSocket Stream

Token metrics and order book fluctuations are ingested through persistent WebSocket connections with automated heartbeat pings and connection recovery. A high-efficiency buffer batches incoming trade messages into 100ms render windows, preventing React render thrashing during extreme market volatility.

Engineering Metrics & Commercial Outcomes

Frequently Asked Questions