Visit the HQApi wiki for documentation:

http://support.hyperic.com/display/DOC/HQ+Web+Services+API

Binary builds for HQApi can be found at:

http://hudson.hyperic.com/

Version compatibility guide:

HQApi 6.0.2 -> HQ 5.8.1
HQApi 6.0.1 -> HQ 5.8
HQApi 5.x -> HQ 4.6
HQApi 4.x -> HQ 4.5
HQApi 3.x -> HQ 4.3/4.4
HQApi 2.x -> HQ 4.2
HQApi 1.x -> HQ 4.1/HQ 4.2