Launch AppUtility
🗄️Developer Resource // JSON Endpoint

KOSS JSON Data API

Access 166 data points for KOSS spanning 42 years (1984–Mar 2, 2026). Optimized JSON format (24.3 KB).

Download as CSV

Prefer CSV format? Download KOSS historical data as a CSV file for Excel, Google Sheets, or any spreadsheet application.

GET /api/tickers/KOSS/json● 200 OK (Live)

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{
  "symbol": "KOSS",
  "timestamp": "2026-03-02T23:55:32.887Z",
  "price": 4.1,
  "change_24h": -0.7263922518159867,
  "history_sample": [
    {
      "date": "1984-12-01",
      "open": 0.19,
      "high": 0.47,
      "low": 0.16,
      "close": 0.41,
      "volume": 1294800
    },
    {
      "date": "1985-03-01",
      "open": 0.41,
      "high": 0.47,
      "low": 0.28,
      "close": 0.28,
      "volume": 313200
    }
  ]
}
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Import via CLI

Don't scrape. Use our open-source importer to normalize this dataset directly into your local database.

npx pocket-portfolio --import KOSS
🛡️

Need to archive this data?

Don't rely on ephemeral endpoints. Automatically sync KOSS.json updates to your private Google Drive for backtesting and compliance.

Enable Sovereign Sync

Includes unlimited API calls & historical CSV exports.

Dataset Specifications

  • Format: Standardized JSON (OHLCV)
  • Frequency: End-of-Day (EOD) + Real-time delay
  • Adjustments: Split-adjusted, Dividend-adjusted
  • Source: Multi-provider aggregation (AlphaVantage, Yahoo fallback)