portfolio tracker market data api

Build a Real-Time Portfolio Tracker with a Market Data API

Aggregate live prices across Forex, Crypto, Stocks, and Metals into a unified portfolio tracker using REST and WebSocket feeds.

Runnable example

Multi-symbol portfolio snapshot (Node.js)

const symbols = ["XAUUSD", "BTCUSD", "AAPL", "EURUSD"];

const prices = await Promise.all(
  symbols.map(s =>
    fetch(`https://api.realmarketapi.com/api/v1/price?ApiKey=YOUR_KEY&SymbolCode=${s}&TimeFrame=M1`)
      .then(r => r.json())
  )
);

const portfolio = symbols.map((s, i) => ({
  symbol: s,
  price: prices[i].ClosePrice,
}));
console.log(portfolio);

Production notes

Switch to WebSocket streams for holdings above a material threshold to avoid polling overhead.
Normalise all prices to a single base currency before aggregating cross-asset P&L.
Cache entry prices at position-open time; only fetch current price deltas for live P&L updates.

Next steps

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