EVM Token Launchpad Contract

A EVM token launchpad that uses bonding curve mechanics for price discovery and automatically lists tokens on DEX when they reach a target market cap.

Overview

This project implements a factory-based token launchpad where users can create new tokens with a bonding curve pricing mechanism. Tokens automatically graduate to a DEX when they reach a target market capitalization of $70,000 USD.

Features

• Easy Token Creation: Create new tokens with just a name, symbol, and 0.02 ETH fee
• Bonding Curve Pricing: Automated market maker (AMM) style pricing using constant product formula
• Automatic DEX Listing: Tokens automatically list on DEX when reaching $70k USD market cap
• Dynamic Price Discovery: Real-time price updates based on Chainlink ETH/USD oracle
• Security First: Built with OpenZeppelin contracts, reentrancy guards, and access controls
• Multi-Chain Support: Configured for multiple EVM networks

Architecture

Core Contracts

MemeCoinFactoryV7.sol

The main factory contract that:

• Creates new token instances
• Manages token registry
• Handles buy/sell operations through bonding curves
• Collects creation fees

BondingCurveV7.sol

Implements the bonding curve mechanism:

• Constant product formula: x * y = k
• Initial virtual reserves: 1 ETH and 1,073,741,824 tokens
• Target market cap: $70,000 USD
• Automatic DEX listing when target is reached
• Trading fee: 1% (configurable)

MemeCoin.sol

Standard ERC20 token contract:

• Fixed initial supply: 1 billion tokens
• Mint and burn functionality
• Owned by factory contract

Bonding Curve Mechanics

The bonding curve uses a constant product formula where:

Virtual ETH = INITIAL_VIRTUAL_ETH + totalEthIn
Virtual Token = K / Virtual ETH
Price = Virtual ETH / Virtual Token

Buy Calculation

When buying tokens with ETH:

1. Calculate new virtual ETH after adding ETH amount
2. Calculate new virtual token amount
3. Tokens received = current virtual tokens - new virtual tokens

Sell Calculation

When selling tokens for ETH:

1. Calculate new virtual token amount after adding tokens
2. Calculate new virtual ETH amount
3. ETH received = current virtual ETH - new virtual ETH

Installation

Prerequisites

• Node.js (v14 or higher)
• npm or yarn
• Hardhat

Setup

1. Clone the repository:

git clone <repository-url>
cd EVM-token-launchpad-contract

2. Install dependencies:

npm install
# or
yarn install

3. Create a .env file in the root directory:

PRIVATEKEY=your_private_key
SEPOLIA_NETWORK=https://sepolia.infura.io/v3/your_key
SEPOLIA_PRIVATEKEY=your_private_key
GOERLI_NETWORK=https://goerli.infura.io/v3/your_key
XLAYER_NETWORK=https://xlayer-rpc.okx.com
XLAYER_PRIVATEKEY=your_private_key
XLAYER_TEST_NETWORK=https://x1testrpc.okx.com
OWNER_PRIVATE=your_private_key
ZIRCUIT_NETWORK=https://zircuit1.p2pify.com
BASE_PRIVATEKEY=your_private_key
Arb_Mainnet=https://arb1.arbitrum.io/rpc
ArbMainnet_PRIVATEKEY=your_private_key
Coinmarketcap=your_coinmarketcap_api_key

Usage

Compile Contracts

npx hardhat compile

Run Tests

npx hardhat test

Deploy Factory Contract

npx hardhat run scripts/deployMemeCoinFactory.js --network <network-name>

Create a Token

npx hardhat run scripts/createToken.js --network <network-name>

Buy Tokens

npx hardhat run scripts/buyToken.js --network <network-name>

Sell Tokens

npx hardhat run scripts/sellToken.js --network <network-name>

Check Progress

npx hardhat run scripts/getCurrentProgress.js --network <network-name>

Network Configuration

The project is configured to support the following networks:

• Sepolia (Testnet) - Chain ID: 11155111
• Goerli (Testnet) - Chain ID: 5
• Monad (Testnet) - Chain ID: 10143
• Monad (Mainnet) - Chain ID: 143
• Base (Mainnet) - Chain ID: 8453
• Arbitrum (Mainnet) - Chain ID: 42161
• XLayer (Mainnet) - Chain ID: 196
• XLayer Testnet - Chain ID: 195
• Zircuit - Chain ID: 48899

Contract Details

Token Creation

• Creation Fee: 0.02 ETH
• Initial Supply: 1,000,000,000 tokens (1 billion)
• Name Length Limit: 32 characters
• Symbol Length Limit: 10 characters
• Symbol Uniqueness: Enforced per creator

Bonding Curve Parameters

• Initial Virtual ETH: 1 ETH
• Initial Virtual Token: 1,073,741,824 tokens
• Constant K: 1,073,741,824 (INITIAL_VIRTUAL_ETH × INITIAL_VIRTUAL_TOKEN)
• Target Market Cap: $70,000 USD
• Trading Fee: 1% (100 basis points, configurable)
• Price Update Interval: 5 minutes

Automatic DEX Listing

When a token reaches the target market cap:

1. Trading on bonding curve is disabled
2. Excess ETH is sent to factory owner
3. Remaining ETH is converted to WETH
4. DODO Vending Machine pool is created
5. Token becomes tradeable on DEX

Security Considerations

• Reentrancy protection using ReentrancyGuard
• Access control with OpenZeppelin Ownable
• Safe token transfers with SafeERC20
• Factory-only execution modifiers
• Input validation on all public functions
• Overflow protection (Solidity 0.8.x)

Development

Project Structure

.
├── contracts/
│   ├── BondingCurveV7.sol      # Bonding curve implementation
│   ├── MemeCoin.sol            # ERC20 token contract
│   ├── MemeCoinFactoryV7.sol   # Factory contract
│   ├── interface/              # Contract interfaces
│   └── lib/                    # Math library
├── scripts/                    # Deployment and interaction scripts
├── test/                       # Test files
├── hardhat.config.js          # Hardhat configuration
└── package.json               # Dependencies

Testing

Run the test suite:

npx hardhat test

Run tests with gas reporting:

GAS_REPORT=true npx hardhat test

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Note: This project is in active development. Always test thoroughly on testnets before deploying to mainnet.