XZERIUM Presale Smart Contract: A Secure & Feature-Packed Token Sale Solution

XZERIUM Presale Smart Contract: A Secure & Feature-Packed Token Sale Solution

🚀 Introduction

The XZERIUM Presale Smart Contract is a highly secure, multi-phase token sale platform built for the XZERIUM project. Developed on Ethereum using Solidity, it combines advanced security mechanisms, live price feeds, and flexible sale options to ensure a fair and transparent fundraising process.

🔒 Security Features

1️⃣ Reentrancy Protection

✔ Uses OpenZeppelin’s ReentrancyGuard to prevent reentrancy attacks.✔ Critical functions (purchases, refunds) are secured with nonReentrant.

2️⃣ Oracle Security

✔ Chainlink Price Feeds (ETH, BNB, USDT) for real-time pricing.✔ Checks for:

• Stale data (reverts if older than ORACLE_TIMEOUT).

• Invalid prices (negative/zero values rejected).

• Complete rounds (ensures fresh data).

3️⃣ Gas Price Protection

✔ Minimum gas price (minGasPrice) prevents frontrunning.✔ Gas limit (purchaseGasLimit) enforced during network congestion.

4️⃣ Pausable Mechanism

✔ Owner can pause/unpause the sale in emergencies.✔ Prevents transactions during critical updates.

5️⃣ Timelock for Critical Changes

✔ Changes to fundsRecipient require a 24-hour timelock.✔ Prevents sudden unauthorized withdrawals.

6️⃣ Vesting & Refund Safeguards

✔ Vesting: Tokens unlock linearly over 180 days (prevents dumping).✔ Refunds: If soft cap isn’t met, investors get USDT refunds.

💵 Live Price Integration

Supported Payment Methods

🔹 ETH (Ethereum)

• Oracle: Chainlink ETH/USD

• Usage: Direct purchases with ETH.

🔹 BNB (Binance Coin)

• Oracle: Chainlink BNB/USD

• Usage: Cross-chain compatibility.

🔹 USDT (Tether)

• Oracle: Chainlink USDT/USD

• Usage: Stablecoin option (1 USDT ≈ 1 USD).

How It Works

1. ETH/BNB Purchases:

• Fetches live price from Chainlink.

• Converts token amount to USD value.

• Calculates required ETH/BNB based on current rate.

2. USDT Purchases:

• Fixed-rate conversion (1 USDT = $1).

• Transfers USDT directly to fundsRecipient.

Example:

uint256 ethPrice = getPriceInUSD(Asset.ETH); // $3,000
uint256 costETH = (amount * tokenPrice) / ethPrice;

🔥 Key Features

1️⃣ Multi-Phase Presale

• 🔒 Private Sale:

• Fixed price: $0.015 per token.

• 0.3% burn on every purchase (deflationary).

• Whitelist-only (optional).

• 🌍 Public Sale (3 Rounds):

• Increasing prices ($0.02 → $0.025 → $0.03).

• Early-bird bonus (+5% tokens in first 48 hours).

2️⃣ Deflationary Tokenomics

• 🔥 Automatic Burns:

• Unsold tokens burned after presale.

• Private sales trigger 0.3% burn per tx.

• ⚡ Controlled Team Burns:

• Team can burn up to 0.5% of holdings at a time.

3️⃣ Flexible Admin Controls

• 📝 Whitelist Management:

• Add/remove addresses in batches.

• Toggle whitelist requirement (useWhitelist).

• ⚙️ Dynamic Adjustments:

• Update vesting duration.

• Modify gas limits & min gas prices.

• Adjust sale timings (with safeguards).

4️⃣ Investor Protections

• 🧳 Wallet Limits:

• Max 5,000 tokens per wallet.

• Min 50 tokens per purchase.

• 💸 Refund System:

• If soft cap isn’t met, USDT refunds are issued.

✅ Why This Contract Stands Out

✔ Secure: Reentrancy protection, oracle checks, pausability.
✔ Flexible: Supports ETH, BNB, USDT with live pricing.
✔ Fair: Vesting prevents dumping, burns reduce supply.
✔ Transparent: All parameters adjustable with safeguards.