gist.tsx

...
const amount = ethers.utils.parseUnits(inputText, contract.decimals)

  const erc20Abi = [
    {
      constant: false,
      inputs: [
        {
          name: 'spender',
          type: 'address',
        },
        {
          name: 'amount',
          type: 'uint256',
        },
      ],
      name: 'approve',
      outputs: [
        {
          name: '',
          type: 'bool',
        },
      ],
      payable: false,
      stateMutability: 'nonpayable',
      type: 'function',
    },
  ]

  return c.contract({
    abi: erc20Abi,
    chainId: 'eip155:8453', // hardcoded base for now
    functionName: 'approve',
    args: [surveyBountyContract.address, amount],
    to: contract.address,
  })
...