Single Item Vendor

The central market sells to players at about 2× an item's value and buys from them at about 0.75×. Everything between those two numbers is yours: price inside that gap and you are cheaper for buyers and better for sellers than the market, and you profit on both.

A single item vendor holds one line, in any quantity. Shoppers touch it and buy or sell right there in-world.

Stock it from your inventory in-world, or link it to one of your storage chests, set how much to keep back, and restock in one press. Set its prices on the website, where the line shows what the market is asking and paying right now, so you can see at a glance whether you are beating it. Put coins in the till so it can buy from players, and take your takings out whenever you like.

Security decides who can manage it, never who can shop there: Private is just you, and Colony hands it to your colony's leaders and managers. Set any coin type to run a currency exchange, stretch it over your goods and make it transparent, or link it to your own mesh as the master prim.