great plugin! But you should put a cycle button, it will better, and i love the plugin for me and my friends.

I downloaded it, and when I started my server, it couldn't be enabled because it said "Unsupported API version 1.21.4". My server is version 1.21.1 :(

Great plugin! This will make trading halls MUCH faster!!
As expected, this also works great with Purpur (a fork of Paper).

Plugin does exactly what it says, right out of the box. Only note I would add is that just pressing 'F' doesn't seem to be enough to trigger the trade cycle, you actually have to execute an off-hand swap. It's easy enough to do that by hovering over an item in your bag when you press 'F', it just took me a minute to figure it out and I didn't see it explicitly mentioned.