CivilizationsMC

CivilizationsMC adds a server-side economy to NeoForge 1.21.1. You can form a clan, earn coins by selling to the server, list items on a multi-page auction house, set up your own player shop, and work through a tiered 30-quest ladder. Your balance, clan, and current quest set all show on a per-player sidebar HUD.

Most of the mod runs server-side and uses vanilla container GUIs. The custom shop block is the only piece that renders on the client.

Commands

/clan create|invite|accept|leave|disband|list
/balance, /balance give|set (op), /pay <player> <amount>
/bank opens a withdraw/deposit GUI for paper banknotes
/ah opens the auction-house GUI. /ah sell|buy|cancel|list|mine also work as direct commands.
/sell opens the cart GUI. /sell hand and /sell all sell instantly, /sell list opens a paged price catalog.
/quests shows your active quest set and lets you claim rewards.
Right-click a placed Shop block. Buyers see a vanilla villager trade screen, owners see a config GUI.

Features

Clans

Create a clan, invite players, accept invites, leave, disband, see the list of active clans
Members can still hurt each other in PvP (friendly fire is on by default)

Currency and Bank

Per-player coin balance stored with the world
/pay for peer-to-peer transfers
/bank lets you withdraw your balance as paper banknotes and deposit them back. Banknotes are vanilla paper with custom data so any client can read them.

Auction House

Vanilla 6-row chest GUI with Browse, Sell, My Listings, and Returns pages, plus a 3-row Confirm Cancel modal
Browse sort cycle (Newest, Price low to high, Price high to low) with right-click to go backwards
Each listing's lore shows the price, seller, an expiry countdown, and a colored call-to-action line
5% listing tax and 10% sale tax act as money sinks
48-hour listing expiry. Expired items go straight to Returns and you can claim them whenever.
Enchantments, custom names, and custom_data survive a listing round-trip

Player Shops

Custom Shop block crafted from 6 planks and an emerald, with its own model and texture
Has a HORIZONTAL_FACING blockstate so the front of the block always points at whoever placed it
First right-click claims ownership
Owners get a chest-style config GUI for adding and removing offers, setting prices with step buttons, and depositing stock from their inventory
Buyers get the vanilla villager trade screen. Payment comes out of /balance and splits 90% to the owner, 10% to a sink.

Server Sell-Shop (the money faucet)

/sell opens a cart GUI. Click an item in your inventory to add it to the cart, click Sell to open the confirm modal, click Confirm to mint the coins.
/sell hand and /sell all for fast sales without the GUI
/sell list opens a paged catalog showing every sellable item and its price
Around 80 items in the price list. Rare and non-farmable items (diamond, netherite, beacon, dragon head, and so on) pay well. Farmable items pay 1 coin.

Quests

30 quests in 6 tiers of 5. Finish all 5 in your current set and the next set unlocks.
Sell, list, and buy quests use lifetime counters, so your progress carries over between sets
Click a completed quest in /quests to claim its coin reward

Sidebar HUD

Per-player scoreboard sidebar showing your Balance, your Clan, and your active quest set with live progress
Refreshes about every two seconds and uses vanilla scoreboard packets

Polish

Every system message uses a colored prefix: CLANS | ..., ECONOMY | ..., BANK | ..., AUCTION | ..., SHOP | ..., QUESTS | ...
Hover any sellable item anywhere in the game and the tooltip shows Sells for: X coins
Network version check rejects clients running the wrong mod version at the handshake

Anti-Dupe Protection

All display containers are read-only at the Container level. setItem, removeItem, removeItemNoUpdate, and clearContent all refuse external writes.
Every display item is stamped with a hidden marker. Any marked item that lands in a player inventory, on the cursor, or as a dropped ItemEntity gets deleted within a single server tick.
Stops inventory extract/sort mods (Quark's Inventory Sorting buttons, Sophisticated Backpacks' Pickup upgrades, and so on) from pulling items out of the GUIs