Hi Docchang,

You can access the Google Finance data which is available as a JSON feed (similar to XML but with a few advantages).  From there, you can built your own tools to display the data or use some of Google's other tools such as the charting

http://code.google.com/apis/chart/types.html

or visualization tools

http://code.google.com/apis/visualization/documentation/gallery.html

to display the data.

From a technical standpoint, it's wide open.

From a legal standpoint, not so much. The US data available is Real Time, which means you can't legally display the data without putting in place a number of exchange agreements. Dealing with the exchanges is not unlike dealing with the mafia. They want your money and have a gang of thugs (or in this case lawyers) ready to break your legs to get it.  On the upside, other exchanges show delayed data which can be displayed without restriction.

If you are just building a small tool for personal use, then your not in any great danger. If you wish to use it for a commercial site, you may wish to use the Yahoo feed for US data which is delayed. Data for non US exchanges seems to be delayed, though I've only checked Canada.

I made up a proof of concept page athttp://mcenaney.ca/code/gfinance/ if you wish to see it. Fair warning - I've only tested it on Chrome and Safari so that page is probably quite buggy on ie and firefox.

regards,

On Apr 28, 4:01 pm, docchang <doc....@gmail.com> wrote: