advanced-weth

A smart contract that adds functionality to the Wrapped Ether smart contract which allows users to interact with other smart contracts that consume WETH transparently as if they are using ETH directly.

Requires a single approval from the user for the AdvancedWETH contract to spend any amount of their WETH, and thus benefits from widespread use of a canonical advanced WETH contract. Because this approval never runs out or expires, this is a once-per-account requirement to permanently enhance the capabilities of WETH.

The benefit of removing special handling of ETH from your contract is that you can reduce your interface size significantly, i.e. you can pretend that ETH already implements the ERC20 interface and consume ETH via the AdvancedWETH contract.

Methods documentation

All methods are documented inline in the contract interface.

Deploying a test version

For unit tests, you can depend on the advanced-weth npm package for access to the contract interface and the build artifacts.

npm install --save advanced-weth

Use the bytecode stored in the import path advanced-weth/build/contracts/AdvancedWETH.json file to deploy the contract for unit tests.

Note only the interface solidity code is shared in the npm package. This is because to deploy the contract on a testnet, you should use the build artifact to get an exact copy of the AdvancedWETH contract regardless of local solc compiler settings.

The constructor has a single argument, the WETH contract address.

Deploy addresses

The build artifacts in the npm package contain the deployment addresses for programmatic consumption.

The AdvancedWETH contract is deployed and verified to the address 0x27E90122950c9E4E669edcC90Fac6c105770420b on the networks:

• mainnet: https://etherscan.io/address/0x27E90122950c9E4E669edcC90Fac6c105770420b
• ropsten: https://ropsten.etherscan.io/address/0x27E90122950c9E4E669edcC90Fac6c105770420b
• rinkeby: https://rinkeby.etherscan.io/address/0x27E90122950c9E4E669edcC90Fac6c105770420b
• kovan: https://kovan.etherscan.io/address/0x27E90122950c9E4E669edcC90Fac6c105770420b
• goerli: https://goerli.etherscan.io/address/0x27E90122950c9E4E669edcC90Fac6c105770420b

Disclaimer

This contract has not been audited, nor formally verified. Use at your own risk.