Let's say you want to sell 100 of your Jungle Logs. Each $10 would give players 5 logs.
You will need a sign and the 100 logs in your inventory. Hold the logs in hand and type /itemdb, this will tell you that a short name is just Jungle.
Place your sign and
• Line 1 type [Trade]
• Line 2 type the amount you are selling for - $10
• Line 3 type how many logs they get followed by the name (short name), a colon and the total amount of logs you are selling - 5 Jungle:100
After this click Done.

If everything went okay [Trade] will turn blue, the 100 logs will disappear and your name will appear in grey at the bottom.
If someone buys from you the 100 will drop with 5 each time until it reaches 0. The 0 next to $10 will increase with 10 each time someone buys.
You collect the money by RIGHT-clicking the sign with empty hand. You can refill sign with more logs by RIGHT-clicking with more logs in hand.
You can refill your sign with more logs than what you initially put as total. Just right-click with more logs.
If you break the sign while it still has items/money in it, all that remains will re-appear in your inventory/balance. If there is no more space then items will drop to ground.

If [Trade] turns red in color it means something went wrong. Usually you get information in-game of what the error is.
Make sure you have 100 logs in your inventory, also when you write line 2 you only type the money $10. Do NOT add the :0 - This is added automatic by the game.
Make sure the amount you give for each sell adds up to the total. e.g., You can not sell 64 items when you give 5 each time. You will end 1 short. Sell 60 or 65 in that case.
You can always fill up with more items by right-clicking with item in hand anyways.
If [Trade] is black and no name appeared at the bottom it means you made a typo somewhere.

Buying items works the same way as selling but in reverse. Let's say you want to buy 1 Slimeball for $5 each. But no more than $200. Place sign and
• Line 1 type [Trade]
• Line 2 type the amount you will buy per click and the short name - 1 Slimeball
• Line 3 type the amount of money you will pay for each selling, colon, then how much money you are willing to pay in total. - $5:200
After this click Done.

If everything went okay [Trade] will turn blue, $200 will be taken from your balance and your name will appear in grey at the bottom.
If someone sells to you, the $200 will drop with $5 each time until it reaches $0. The :0 next to 1 Slimeball will increase with 1 each time someone buys.
You collect the items sold to you by RIGHT-clicking the sign. Unlike refilling with items you can not refill signs with more money.
Once all the money is gone you need to break and place a sign again and repeat the progress.
If you break the sign while it still has items/money in it, all that remains will re-appear in your inventory/balance. If there is no more space then items will drop to ground.

If [Trade] turns red in color it means something went wrong. Usually you get information in-game of what the error is.
Make sure you have enough money in your /balance. In line 2 you only put amount and short name 1 Slimeball. Do NOT add the :0 - This is added auto by the game.
Make sure the math adds up. e.g., You can not sell for $32 when you give $5 each time. You will end $3 short. Sell $30 or $35 in that case.
If [Trade] is black and no name appeared at the bottom it means you made a typo somewhere.

Trading items works the same as buy/sell. Say you want trade 32 cobblestone for 10 spruce log, you only have 1 stack of stone. Place sign and
• Line 1 type [Trade]
• Line 2 type the amount and short name of what you want per click - 10 Spruce
• Line 3 type the amount and short name of how many items they get per click, colon, and total amount - 32 Cobble:64
After this click Done.

If everything went okay [Trade] will turn blue, 64 cobblestone will be taken from your inventory and your name will appear in grey at the bottom.
If someone trades with you the 64 stone will drop with 32 each time until it reaches 0. The :0 next to 10 Spruce will increase with 10 each time someone trades.
You collect the items you traded by RIGHT-clicking the sign. You can refill sign with more items by RIGHT-clicking with the item in hand.
If you break the sign while it still has items in it, all that remains will re-appear in your inventory. If there is no more space then items will drop to ground.

If [Trade] turns red in color it means something went wrong. Usually you get information in-game of what the error is.
Make sure you have enough items (64 cobblestone) in your inventory. In line 2 you only put amount and short name 10 Spruce. Do NOT add the :0 - This is added auto by the game.
Make sure the math adds up. e.g., You can not sell 30 stones when you give 32 each time. You will end 2 short. Sell 32, 64, 96, 128 and so on.
If [Trade] is black and no name appeared at the bottom it means you made a typo somewhere.

Right-click this sign at the trading center with 1 diamond ore at hand and you get $1000.

Right-click this sign at the trading center with empty hand and you get 1 diamond ore for $1000.

By popular demand we added villager egg at the trading center.
Right-click the sign with empty hand and get 1 villager egg for $10.000.
Warning! Do not try and spawn the egg at spawn area because all spawning is set do denied there.