pragma solidity ^0.5.0;


contract Ether {
    function balanceOf(address wallet) external view returns (uint256) {
        return wallet.balance;
    }
}

{
  "compilationTarget": {
    "Ether.sol": "Ether"
  },
  "evmVersion": "istanbul",
  "libraries": {},
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "remappings": []
}