🗄️Developer Resource // JSON Endpoint

DUOL JSON Data API

Access 249 data points for DUOL spanning 5 years (2021–Apr 22, 2026). Optimized JSON format (36.5 KB).

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Download as CSV

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

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

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{
  "symbol": "DUOL",
  "timestamp": "2026-04-22T20:51:31.711Z",
  "price": 105.52,
  "change_24h": 2.815940758062945,
  "history_sample": [
    {
      "date": "2021-07-26",
      "open": 141.4,
      "high": 145,
      "low": 128.5,
      "close": 140.25,
      "volume": 4199500
    },
    {
      "date": "2021-08-02",
      "open": 140,
      "high": 152.84,
      "low": 132.4,
      "close": 134.38,
      "volume": 2952700
    }
  ]
}
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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 DUOL
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Need to archive this data?

Don't rely on ephemeral endpoints. Automatically sync DUOL.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)
> system_ready. Initialize Sovereign reasoning for this asset?[Y]— open Terminal