Guild/Mutual trading system

Alright so 3 of my suggestions have have it into the game so here is possibly lucky #4.

In your guild or with mutuals you can place either shards, gold bells or silver bells up for trade and you can accept the trade ONLY IF it matches the value of what you're giving up.

Example:

10 gold bells = 20 silver bells

10 silver bells = 30 L rarity shards

1 XXL buddy = 2 XL buddy = 3 L buddy

5 gold shards = 10 purple shards

You can also trade stuff of equal value but they can be the same, example with shards:

5 Gold water tank = 5 Gold fire tank

5 Gold nature dps = 5 Gold water dps

Im still trying yo figure out how it will work but this is a general idea i have