Query real-time stock prices and market data using the Stock Prices API. Responses are in TOON format—decode with @toon-format/toon. Use when fetching stock...
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This skill helps you work with the Stock Prices API to fetch real-time market data and stock quotes.
Base URL:
https://stock-prices.on99.appPrimary Endpoint:
/quotes?symbols={SYMBOLS}Fetch stock quotes for one or more symbols (responses are in TOON format):
curl "https://stock-prices.on99.app/quotes?symbols=NVDA" curl "https://stock-prices.on99.app/quotes?symbols=AAPL,GOOGL,MSFT"
Install the TOON decoder for parsing:
pnpm add @toon-format/toonThe API returns TOON (Token-Oriented Object Notation) format—a compact, human-readable encoding that uses ~40% fewer tokens than JSON. This makes it ideal for LLM prompts and streaming.
quotes[1]{symbol,currentPrice,change,percentChange,highPrice,lowPrice,openPrice,previousClosePrice,preMarketPrice,preMarketChange,preMarketTime,preMarketChangePercent,...}: NVDA,188.54,-1.5,-0.789308,192.48,188.12,191.405,190.04,191.8799,3.3399048,2026-02-11T13:49:16.000Z,1.771457,...
Use
@toon-format/toonimport { decode } from "@toon-format/toon";const response = await fetch("https://stock-prices.on99.app/quotes?symbols=NVDA"); const toonText = await response.text(); const data = decode(toonText);
// data.quotes is an array of quote objects const quote = data.quotes[0]; console.log();${quote.symbol}: $${quote.currentPrice}
The decoded structure matches JSON—same objects, arrays, and primitives.
| Field | Type | Description |
|---|---|---|
| string | Stock ticker symbol |
| number | Current trading price |
| number | Price change from previous close |
| number | Percentage change from previous close |
| number | Day's high price |
| number | Day's low price |
| number | Opening price |
| number | Previous day's closing price |
| number | Pre-market trading price |
| number | Pre-market price change |
| string (ISO 8601) | Pre-market data timestamp |
| number | Pre-market percentage change |
Query multiple stocks by separating symbols with commas (max 50):
curl "https://stock-prices.on99.app/quotes?symbols=AAPL,GOOGL,MSFT,TSLA,AMZN"
Always check for valid responses. Decode TOON before accessing data:
import { decode } from "@toon-format/toon";const response = await fetch("https://stock-prices.on99.app/quotes?symbols=NVDA"); const data = decode(await response.text());
if (data.quotes && data.quotes.length > 0) { const quote = data.quotes[0]; console.log(); }${quote.symbol}: $${quote.currentPrice}
Calculate common metrics:
// Determine if stock is up or down const isUp = quote.change > 0; const direction = isUp ? "📈" : "📉";// Calculate day's range percentage const rangePct = ((quote.highPrice - quote.lowPrice) / quote.lowPrice) * 100;
// Compare current to open const vsOpen = quote.currentPrice - quote.openPrice;
import { decode } from "@toon-format/toon";async function checkPrice(symbol: string) { const res = await fetch(
); const data = decode(await res.text()); const quote = data.quotes[0];https://stock-prices.on99.app/quotes?symbols=${symbol}return { price: quote.currentPrice, change: quote.change, changePercent: quote.percentChange, };}
import { decode } from "@toon-format/toon";async function getPortfolio(symbols: string[]) { const symbolString = symbols.join(","); const res = await fetch(
); const data = decode(await res.text());https://stock-prices.on99.app/quotes?symbols=${symbolString}return data.quotes.map(q => ({ symbol: q.symbol, value: q.currentPrice, dailyChange: q.percentChange, }));}
import { decode } from "@toon-format/toon";async function marketSummary(symbols: string[]) { const res = await fetch(
); const data = decode(await res.text());https://stock-prices.on99.app/quotes?symbols=${symbols.join(",")}const gainers = data.quotes.filter(q => q.change > 0); const losers = data.quotes.filter(q => q.change < 0); return { totalStocks: data.quotes.length, gainers: gainers.length, losers: losers.length, avgChange: data.quotes.reduce((sum, q) => sum + q.percentChange, 0) / data.quotes.length, };}
AAPLGOOGLMETAAMZNNFLXMSFTNVDATSLAAMDINTCORCL^GSPC^DJI^IXICdecode()@toon-format/toonNo automatic installation available. Please visit the source repository for installation instructions.
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