is there an option to ban a person from your topic ?
to ban the snip of illegal players. (bot user/abuser)

Jsp trade becoming unbearable

Good day, you can only block users in Private Messages, if they spam your topic or you feel someone is sniping. I'd suggest you report them via the report button (do not answer them).

If this is an ongoing problem please collect all the links and if it's in the trading grounds, contact:
Trade Assistant: https://forums.d2jsp.org/staff.php?g=28
Trade Moderator: https://forums.d2jsp.org/staff.php?g=25