Alpha Vantage Intraday Summary API

A self-hosted C# .NET Web API that consumes the Alpha Vantage intraday stock price API, processes the data, and exposes a new endpoint that returns daily aggregated statistics for the last month.

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Features

This API:

• Calls the Alpha Vantage intraday (15-minute interval) endpoint.
• Retrieves the last month of intraday candles.
• Groups candles by day.
• Computes:
  • Average low price,
  • Average high price,
  • Total daily volume.
• Returns results in this format:

[
  {
    "day": "2025-11-14",
    "lowAverage": 503.82,
    "highAverage": 507.28,
    "volume": 32677352
  }
]

Setup

1. Add your Alpha Vantage API key

Open appsettings.json and update the AlphaVantage section:

"AlphaVantage": {
  "ApiKey": "YOUR_API_KEY_HERE",
  "BaseUrl": "https://www.alphavantage.co/query"
}

Replace "YOUR_API_KEY_HERE" with a valid API key from: https://www.alphavantage.co/support/#api-key

2. Run the API

From the project directory,

dotnet run

3. Call the endpoint

Use GET /intraday-summary/{symbol} (Example: /intraday-summary/TSLA)

Running the Unit Tests

This project includes unit tests located in AlphaVantageApi.Tests.

To execute all tests:

dotnet test