The unbind fee can be an issue during bound weapon transactions between the seller and buyer. The buyer has to take a huge risk by handing over the unbind fee to a complete stranger and pray they don't run off with it. I've known too many people to be scammed by this process and very often, transactions don't take place at all if the seller cannot pay the unbind.
This system would help solve this problem. In my example, the seller is the person whom has the bound weapon to sell and the buyer is, well, the buyer of the bound weapon.
At Vise, there would be a trade option. You would type in the name of the knight you wish to trade with and the seller would receive a notification, such as '(username) would like to trade through Vise with you.' You would get the prompt window that would let you trade or ignore the message.
Then, the seller would put his unbound weapon on his side of the window. There would be a separate section for the unbind amount, available to be added by either the buyer or the seller. The transaction would not go through if there is not enough energy in the unbind section to unbind the weapon. The buyer can add CE in their half of the window for the rest of the payment.
Essentially, this system would make Vise a middleman. The one downfall I can think of is figuring out how to code this system. It sounds like it might be a bit of a nightmare.
An alternative would be to exclude Vise completely and modify the trading window altogether with an unbind option if valid for the trade. As noted in the comments, weapons such as the honor weapons, rocket hammers, etc. would not be able to be unbound and excluded from the system as they are permanently bound to the knight.
Senka-Sae added an interesting scenario in this system as well, "If Player A decides to trade a bound 3* weapon and Player B decides to trade a bound 5* weapon, the system calculates that a total sum of 4.6k of Energy needs to be inputted in order for the trade to take effect. Each player can decide to either pay for their respective unbind, vice-versa, or do half-and-half this way (or whatever amount they agree on)."
Criticism and suggestions are welcomed to help improve this idea. Feel free to suggest other ideas to help stop people from running off with the unbind for an item.
Please note this other board by Momofuku with an alternative idea for this problem. I will be editing this as I think of more alternatives to make this less complex.
It's pretty easily codeable. Players are allowed to put bound equipment into the trade window. Have a checkbox next to the confirm button that states the total unbind fee, and the player must check the checkbox in order to click the confirm button. Upon confirming the trade, the person receiving the bound weapon has the unbind fee deducted from their wallet.