Launch AppUtility
🗄️Developer Resource // JSON Endpoint

CSTL JSON Data API

Access 347 data points for CSTL spanning 7 years (2019–Mar 6, 2026). Optimized JSON format (50.8 KB).

Download as CSV

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

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

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{
  "symbol": "CSTL",
  "timestamp": "2026-03-08T04:29:38.169Z",
  "price": 27.12,
  "change_24h": -2.830526692941595,
  "history_sample": [
    {
      "date": "2019-07-22",
      "open": 20,
      "high": 24.75,
      "low": 17.11,
      "close": 22.99,
      "volume": 2665600
    },
    {
      "date": "2019-07-29",
      "open": 22.97,
      "high": 24.52,
      "low": 19.64,
      "close": 21.81,
      "volume": 1019000
    }
  ]
}
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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 CSTL
🛡️

Need to archive this data?

Don't rely on ephemeral endpoints. Automatically sync CSTL.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)