ERC-20 swapping contract

The task is to create a simple Solidity contract for exchanging Ether to an arbitrary ERC-20.

Requirements

1. Implement the following interface as a Solidity Contract

   interface ERC20Swapper {
       /// @dev swaps the `msg.value` Ether to at least `minAmount` of tokens in `address`, or reverts
       /// @param token The address of ERC-20 token to swap
       /// @param minAmount The minimum amount of tokens transferred to msg.sender
       /// @return The actual amount of transferred tokens
       function swapEtherToToken(address token, uint minAmount) public payable returns (uint);
   }

2. Deploy the contract to a public Ethereum testnet (e.g. Sepolia)

3. Send the address of deployed contract and the source code to us

Non-requirements

• Feel free to implement the contract by integrating to whatever DEX you feel comfortable - the exchange implementation is not required.

Evaluation

Following properties of the contract implementation will be evaluated in this exercise:

• Safety and trust minimization. Are user's assets kept safe during the exchange transaction? Is the exchange rate fair and correct? Does the contract have an owner?
• Performance. How much gas will the swapEtherToToken execution and the deployment take?
• Upgradeability. How can the contract be updated if e.g. the DEX it uses has a critical vulnerability and/or the liquidity gets drained?
• Usability and interoperability. Is the contract usable for EOAs? Are other contracts able to interoperate with it?
• Readability and code quality. Are the code and design understandable and error-tolerant? Is the contract easily testable?

npx hardhat test

REPORT_GAS

Erc20SwapperProxy + ProxyAdmin gas needed: 783,906

npx hardhat test coverage

Contract	Address (sepolia)
ProxyAdmin	0x1DEBaaBBE0027E1D7978fEC7F3711EB37c14c09E
ERC20SwapperProxy	0x59cb8d2ED656b0991ED5390721A7a83b177f5BA8
ERC20SwapperImplementation	0x5Ad70433Ba1a24BeBAf560699d82F9E715658a70

|