MetalFillBoy - RE: "am using the free version of QUOTETRACKER and it is working fine with AmiBroker through the API. Maybe Jerry can clarify this point."
AmiBroker uses our HTTP API, which does not require a registration, but only works if you are visiting our advertisers. Registration gets rid of that requirement. The HTTP API requires the calling program to query QT every time you want an update (request/response) The streaming API which would get every tick QT gets and does require the registration