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🗄️Developer Resource // JSON Endpoint

CYN JSON Data API

Access 230 data points for CYN spanning 5 years (2021–Mar 9, 2026). Optimized JSON format (33.7 KB).

Download as CSV

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

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

Tired of exporting to Excel? Track CYN and analyze your portfolio locally with Pocket Portfolio.

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{
  "symbol": "CYN",
  "timestamp": "2026-03-09T18:03:19.465Z",
  "price": 1.521,
  "change_24h": 2.7702702702702653,
  "history_sample": [
    {
      "date": "2021-10-18",
      "open": 120150,
      "high": 130500,
      "low": 94500,
      "close": 111750,
      "volume": 597
    },
    {
      "date": "2021-10-25",
      "open": 109800,
      "high": 148650,
      "low": 106800,
      "close": 118350,
      "volume": 1818
    }
  ]
}
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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 CYN
🛡️

Need to archive this data?

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