I wanted to add a sort of inventory block that would serve the same purpose the crate in Stardew Valley also serves, to where at the end of the day, the player receives money depending on what they put in the box to their account.

For the time being, I want it to be restricted to a creative-mode only obtainable block as I feel that some balancing money wise is gonna need to be made before it would work.

The inventory block would be locked to only payout for a specific individual who is the owner of said block and maybe having a json file that controls the item IDs and their values for each one would allow for a vast level of customization and assigning the monetary values of blocks and their value.

While I understand what you're asking for (as I've played Stardew Valley myself), couldn't you just do this manually by simply creating a persistent and/or creative trader that simply just has a bunch of purchase trades for purchasing said items? While I understand that wouldn't quite have the same feel, it'd be far easier for players to understand what the sell prices for said items are, as well as getting the money instantly instead of having to wait up to 20 minutes to get their payment.

Also, developing something like this would take a fair amount of effort, and have way too few practical uses, as I'm sure most people won't want or need this (as most servers that want to be able to buy items from the players can simply just make a persistent or creative trader to do so without having to fiddle with configuration files, etc). It could probably be done as an independent addon mod (which any mod developer is more than welcome to make if they wish), but I feel this wouldn't fit well with the base Lightman's Currency balance/style, and I don't really want to add a new price settings config file that literally 99% of the users would never use.