🍸 The Rollup Bar — On-Chain Hospitality on Optimism

dApp link :https://mikeminer.github.io/rollupbar/

The Rollup Bar is a fully on-chain hospitality dApp built on Optimism (Layer 2 Ethereum).
Guests can claim free NFT drinks, send on-chain messages, and tip in ETH to speed up service — all directly from their wallet.

“Where every round is a transaction, and every tip rolls up faster.” 🥂

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🔴 Concept

This is the red-themed sibling of Based Pasta Ristorante (Base Network) —
a fun crossover between Web3 and real-world service experiences.

Each guest interaction (press) writes a message and a tip to the smart contract,
emitting an event that appears instantly on the live feed UI.

Optimism Layer 2 provides the perfect bar atmosphere: fast, low fees, and high energy.

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⚙️ Features

• 🧾 On-Chain Orders — Every drink order is stored as a blockchain transaction.
• 🧉 Drink NFTs — Choose among several collectible NFT beverages.
• 💸 Tipping System — Tips in ETH dynamically affect the delivery ETA.
• 🌐 EIP-6963 Wallet Support — Works with MetaMask, Coinbase, Rainbow, Rabby, and more.
• 🔴 Optimism Network — Fully configured for mainnet (chain ID 10).
• ⚡ Instant Feed — Orders and messages stream in real time via event subscriptions.

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🧩 Tech Stack

• Frontend: Pure HTML, CSS, and vanilla JavaScript (no framework required)
• Blockchain: Optimism Mainnet
• Library: ethers.js v6
• Wallet Support: EIP-6963 multi-wallet discovery
• Smart Contract: Minimal press event contract with press() and Pressed event

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🧱 Smart Contract Overview

event Pressed(
  address indexed user,
  uint256 totalPresses,
  uint256 userPresses,
  string message,
  uint256 tip
);

function press(string calldata message_) external payable;
function totalPresses() public view returns (uint256);
function presses(address user) public view returns (uint256);
function cooldownSeconds() public view returns (uint256);