[Cthulhu_]

Eve Online, I'd say - it doesn't allow you to get your space money out, but you can pay for your subscription with it and its marketplace and economy is second to none. Oh and it has APIs and third-party APIs to get market data - although I don't think you can actually trade via an API, which is probably a good thing because high-volume automated traders would probably break the server / economy.

[botter_alt]

It's not Eve or any very popular game. I've told about 5 people and only 1 had ever heard of it.

[listic]

It's really interesting to know what game it is. If I don't know it, I will look it up.

I was always averse to trying out botting in the games where it is against the Terms of Use, that is, every game I know (I guess I'm goody two shoes like that.) The closest I know is Magic Online where trade bots are tolerated by the administration, but I just couldn't stand to play the game itself, even though it sounded fascinating in theory.