Re: Gotta be honest here...
Forex based stuff. So its the API access that costs the most. The site itself is pretty lightweight.
I also have a Bitcoin related trading site.
With the Forex stuff I have to be careful what I say and what I charge for as I could attract the ire of various regulatory bodies.
I dont provide direct advice though, just easy to read charts.
Its going through somewhat of a redesign at the moment (when I find the time) so its pretty barebones right now.
Take a look.
The main nuts and bolts of it are my Twitter bot (which generates a large chunk of the traffic and my various alert systems which at the moment you can only join if you're part of the community I am a part of.