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Solidity 0.6.0 introduced a breaking change in how ETH transfers are performed. The following doesn't work anymore:

weth.deposit.value(amount)();

What is the latest syntax for depositing ETH into the WETH contract?

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  • weth.deposit{value: amount}(); as far as I remember. – goodvibration Nov 23 '20 at 16:59
  • And BTW, WETH is not a fundamental part of the Ethereum standard or infrastructure. It's an ERC20 contract implemented by a "privately held" company. So the question here is generally for any payable function on any contract (I mean, that's how the question should be formulated IMO). – goodvibration Nov 23 '20 at 17:01
  • @goodvibration It depends on your standards, but to me holding 5,411,942 ETH (approximately $316M at the time of writing this) makes WETH a rather important public good in the Ethereum ecosystem. – Paul Razvan Berg Nov 23 '20 at 17:08
  • I included WETH in the formulation because I wanted this q&a to be very specific. Humans like specific examples. There is already another thread about payable functions in general. – Paul Razvan Berg Nov 23 '20 at 17:09
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Solidity 0.6 and 0.7

Here's a simple implementation that can you try out in Remix:

pragma solidity >=0.6.0;

interface WethLike {
    function deposit() external payable;

    function withdraw(uint256) external;
}

contract MyContract {
  WethLike weth;

  constructor(WethLike weth_) {
    weth = weth_;
  }

  function foo() external payable {
    weth.deposit{ value: msg.value }();
  }
}
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