What is the REST API that you hope someone can improve it – Why?

i hope someone fixes the API from alphavantage, so that its Json is properly formatted.

https://www.alphavantage.co/query?function=TIME_SERIES_DAILY...

"Time Series (Daily)": { "2020-02-18": { "1. open": "185.6050", "2. high": "187.6000", "3. low": "185.5000", "4. close": "186.7400", "5. volume": "15794447" },

ex: why put a serial number on...