Solved For now, you will always need the ABI to execute a call against the ethereum network with web3. A simple way is to reconstruct the function you wish to execute is to, either create a separate contract to call or use the trick here and add in the ABI or at least a part of it from the contract you wish to call. In case, I used a generic ABI of an approval call.

await this.state.currentAddress.methods.approve("0x8b4a5682189361ce56702260051900f74d76e08b", amount).send({from: this.state.accounts[0]});

I have the following line in react. It is how I think I could execute the approve function, but it doesn't work. I can certainly get the contract ABI from an API but I want to avoid this. Is there any way to call the Approve function of standard ERC20 tokens via directly through contract address through web3 without having to import the ABI?

1 Answer 1


You will need the ABI. The .methods is an attribute of the contract instance, which you get by using the ABI.

If you are using ethers.js, you can use a shorthand ABI to achieve the same goal:

let abi = ["function approve(address _spender, uint256 _value) public returns (bool success)"]
let provider = ethers.getDefaultProvider('ropsten')
let contract = new ethers.Contract(tokenAddress, abi, provider)
await contract.approve(accountAddress, amount)

Note: if you want to pass in a from, you will have to use ethers opts.

  • 1
    An absolutely brilliant answer. But I opted for an even easier solution; I simply copied the ABI of a simple ERC20 token approval function and as backup added the call to etherscan's api for the ABI if needed. Jan 23, 2020 at 8:33
  • 1
    cool trick with the shorthand ABI !!!
    – korchix
    Feb 13, 2021 at 20:45

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