Quote (http://forums.d2jsp.org/info.php?p=6)
Illegal Trades:
Do not steal other people's trade threads. (you may be warned for this, as it is spamming).
No trades via PM. (It's harder to prove a scam via PM than from a trade thread, so always negotiate and deal through a trade thread, not PM).
Do not trade for / sell real life items outside the Donor Forum. This includes but is not limited to CD keys. No linking to any outside auction or trade sites.
Do not trade accounts, characters, or names. (Exceptions: Eve Online, Diablo II)
Do not make unclear trades. (ie: 100 fg for any items) this includes mystery packages and anything else you may question.
Do not offer fg/items you don't have.
Do not trade items cross games/realms/cores.
Do not use false advertising to describe an item. For example, if an item is a common dupe and is being sold in mass, it cannot be described as legit/perm/whatever else you may use to imply the same meaning.
All trades must be labeled in finite amounts. You may not sell "unlimited" of anything.
Do not hold any kind of events like raffles/ironmans/barbruns etc.
However, at the top of that page, it says "Below are the official rules of the
Trading Ground forums. Please note that these are in addition to the global Site Rules, which also apply:
http://forums.d2jsp.org/info.php?p=9". Basically I THINK that so long as you're not doing it on the forum, there's nothing they can/will do about it. Of course if I'm wrong, I'm not responsible for you getting banned or whatever.
Anyway I would suggest making this trade on the RotMG forums themselves. Pretty sure there's plenty of JSPers on there too.