🗄️Developer Resource // JSON Endpoint
CSTM JSON Data API
Access 156 data points for CSTM spanning 13 years (2013–Apr 22, 2026). Optimized JSON format (22.9 KB).
Private ledger analysis — connect this API slice to the Terminal.
Keep sensitive rows off shared analyst lakes — bounded, explicit flows.
Download as CSV
Prefer CSV format? Download CSTM historical data as a CSV file for Excel, Google Sheets, or any spreadsheet application.
GET /api/tickers/CSTM/json● 200 OK (Live)Tired of exporting to Excel? Track CSTM and analyze your portfolio locally with Pocket Portfolio.
Start Free — Local First{
"symbol": "CSTM",
"timestamp": "2026-04-22T20:52:11.773Z",
"price": 30.81,
"change_24h": 2.837116154873157,
"history_sample": [
{
"date": "2013-06-01",
"open": 14.9,
"high": 16.47,
"low": 14.72,
"close": 16.15,
"volume": 7256600
},
{
"date": "2013-07-01",
"open": 16.24,
"high": 18.69,
"low": 15.75,
"close": 18.21,
"volume": 4311800
}
]
}💻
Import via CLI
Don't scrape. Use our open-source importer to normalize this dataset directly into your local database.
npx pocket-portfolio --import CSTM🛡️
Need to archive this data?
Don't rely on ephemeral endpoints. Automatically sync CSTM.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)