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ERC-20 swapping contract

Spec v1 (2021-04-27)

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);
}
  1. Deploy the contract to a public Ethereum testnet (e.g. Ropsten)
  2. 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?