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Devon Boyer4,020 Points
API for Stock Market Data
Does anyone know a good API to get stock market data? I've tried to check out Yahoo Finance but I was not able to understand how to make it work at all. Anyone have any tips or advice? Thanks! (I am looking to build an iOS app with the data)
Devon I would suggest visiting http://www.jarloo.com/yahoo_finance/ .
Based on the article the Yahoo Finance API is rest based. Meaning you make a call to the base string http://finance.yahoo.com/d/quotes.csv followed by the query string ?s=<query>&f=<financial data>. Where <query> is the stock symbol you're looking to perform a lookup against and <financial data> would refer to the financial data you're seeking ie name, pricing, dividends, date etc. This same article includes a table of all the financial data you can retrieve.
The example URL in the article used http://finance.yahoo.com/d/quotes.csv?s=AAPL+GOOG+MSFT&f=nab would retrieve the name, ask, and bid for the stock symbols APPL, GOOG, and MSFT in CSV format.
Additionally I would check out http://www.jarloo.com/get-yahoo-finance-api-data-via-yql/ to learn how to get data in XML or JSON as opposed to CSV. Note that the base string here is a bit different http://query.yahooapis.com/v1/public/yql?q= <YQL Statement>&env=store://datatables.org/alltableswithkeys . Where <YQL Statement> is based on Yahoo's Query Language. In the example in the article, the statement used to query the symbol AAPL stock information is select * from yahoo.finance.stocks where symbol=”aapl” .
Lastly, by default the URL http://query.yahooapis.com/v1/public/yql?q= <YQL Statement>&env=store://datatables.org/alltableswithkeys would return XML unless you add &format=json into the URL. Hope this betters your understanding of the Yahoo Finance API.