Getting a stock's price history

Question

Are there any simple HTTP APIs out there which will let me get the stock price for a symbol (such as GOOG) at a specific date and time?

Something like...

http://somewebsite.com/?
    symbol=GOOG&
    year=2010&
    month=7&
    day=30&
    hour=4&
    minute=00

Giving a response of $484.85

I'm hoping to have an end result of a haskell function whose type signature looks something like...

getQuote :: Symbol -> Date -> Time -> Price

Answer 1

I believe YQL with Yahoo finance can complete this task, they have data going back to 1996 looking on some stocks.

http://www.yqlblog.net/blog/2009/06/02/getting-stock-information-with-yql-and-open-data-tables/

http://www.gummy-stuff.org/Yahoo-data.htm

Answer 2

Take a look at the Historical Securities Data API at http://www.mergent.com/servius - I don't think they'll have intraday data though...