This project implements an exercise proposed by Eiger, which leverages the creation of a smart contract for swapping Ether to any designated ERC-20.
The smart contract is developed in Solidity with the Hardhat environment. To perform the exchange, it leverages the method exactInputSingle from Uniswap v3 SwapRouter. Since the DEXs are constantly evolving and mutating, the upgradeability of the contract is important, and therefore the UUPS proxy pattern is employed. Also, there is the need to restrict access to some of the sensitive features of the contract, concerning the funds that are exchanged there. For that reason, it utilizes the Ownable pattern, which is a simple but very efficient form of access control.
There is a deployment of this contract on Ethereum Sepolia Testnet:
- Install Node.js locally
- Clone the repository
git clone https://github.com/phbdias/erc20-swap.git
- Install dependencies
cd erc20-swap
npm install
- Compile the contract
npx hardhat compile
- Deploy to a live network
npx hardhat run ./deploy/deploy_swapper.ts --network <network-name>
- Test the code
npx hardhat test --network <network-name>
- Upgrade contract implementation
npx hardhat run ./deploy/upgrade_swapper.ts --network <network-name>
This project uses the following Hardhat configuration variables:
| Name | Description | Example Value |
|---|---|---|
| INFURA_API_KEY | Infura API Key | - |
| SEPOLIA_PRIVATE_KEY | Private key of the owner's wallet | - |
| ROUTER_ADDR | Uniswap v3 SwapRouter address | 0x3bFA4769FB09eefC5a80d6E87c3B9C650f7Ae48E |
| WETH_ADDR | IWETH9 Address | 0xfFf9976782d46CC05630D1f6eBAb18b2324d6B14 |
| USDC_ADDR | USDC Address | 0x1c7D4B196Cb0C7B01d743Fbc6116a902379C7238 |
| SWAPPER_ADDR | ERC20Swapper Address | 0x92fB37EC42DEDBf5187bD040018187b5e4942B80 |