arc tycoon

Arc Tycoon is a fully on-chain, trustless board game built on OPN Testnet — think Monopoly meets DeFi. Players stake CHIP tokens to enter a match, roll dice, buy properties, and collect rent, all enforced by smart contracts with no server or middleman. The first player to double the poorest player's net worth wins the stake pot. Cosmetic outfit NFTs give players a small luck boost on chance cards.

How its work

1. Getting CHIP The TestnetFaucet mints CHIP (an ERC-20) to any wallet that calls claim(), with a 1-hour cooldown. CHIP is the only currency used in the game.

2. Creating a Match Any player calls MatchFactory.createMatch(stakeAmount). This deploys a fresh isolated GameMatch contract. The factory emits a MatchCreated event so the UI can pick it up.

3. Joining 2–4 players call GameMatch.joinMatch(outfitTokenIds). Each player:

Transfers their CHIP stake into the contract (locked as the pot) Optionally equips up to 4 outfit NFTs (one per slot: Head, Body, Feet, Accessory) Gets a luck bonus (up to 5%) based on their equipped items, validated by CosmeticRegistry 4. Playing The host calls startMatch(). Each turn, the active player:

rollAndMove() — dice are rolled pseudo-randomly using block.prevrandao, player moves around the 16-tile board Lands on a property → can buyProperty(), or pays rent if someone else owns it Lands on a tax tile → pays a fixed fee Lands on a chance tile → luck stat influences whether they gain or lose cash Lands on jail tile → stuck for up to 3 turns (roll doubles to escape) endTurn() → moves to the next player Anyone can call skipTurn() if the current player goes idle for 90 seconds.

5. Richest-First Bet (Option A) After every action, the contract checks: does any active player have a net worth ≥ 2× the poorest active player? If yes, that player immediately wins the entire CHIP pot (minus a 5% treasury fee). The match then continues — players keep playing for board dominance.

6. Match End The match ends when:

Only one player remains (others went bankrupt), or The 30-minute deadline is hit (endByTimeout()), or A deadline is crossed mid-action The player with the highest net worth at the end wins any remaining pot.

7. Web UI The React + Vite frontend connects via wagmi/viem, listens to on-chain events in real time using watchContractEvent, and replays the last ~5000 blocks when you load a match so you see the full history.