GSI methods used by Gaia are something like:

http://w w w . gaia online .c o m/chat/gsi/index.php?&v=json&m=[["method number",["parameter 1","parameter 2",...]]]

Method numbers are integers between 1 and 10000 (I guess), and parameters are ... specific parameters used by the specific method that gives a certain information about a part of the site.

Example:

http://www.gaiaonline.com/chat/gsi/index.php?v=json&m=[[102,[50006]]] (GSI method #102) => It gives informations about a user using his used ID (the parameter, which is in our case: 50006).