🗄️Developer Resource // JSON Endpoint
KOSS JSON Data API
Access 167 data points for KOSS spanning 42 years (1984–Apr 22, 2026). Optimized JSON format (24.5 KB).
Programmable Sovereign Interface — chart this JSON in the Terminal.
Local-first analysis. Stateless data. Your browser is the vault.
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)Tired of exporting to Excel? Track KOSS and analyze your portfolio locally with Pocket Portfolio.
Start Free — Local First{
"symbol": "KOSS",
"timestamp": "2026-04-22T18:13:50.140Z",
"price": 4.28,
"change_24h": 4.1362530413625285,
"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
}
]
}💻
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 SyncIncludes 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)