Versions and retirement: how long each API version is supported, and how we announce retirements, is in our API versions and retirement policy. What's new lists each release.
https://gsvcs-stage.geoservices.tamu.edu/Services/ReverseGeocoding/WebService/v04_01/HTTP/default.aspx
Example 1 - 30.610487, -96.327766, TX (CSV)
Example 2 - 30.610487, -96.327766, TX (CSV, with header)
Example 3 - 30.610487, -96.327766, TX (XML)
Example 4 - 30.610487, -96.327766, TX (JSON)