检查令牌是否已被批准python

Question

I have this code for checking if a token is already approved. The problem is, i get everythime 0 even if i put in an approved token. Do you know what im doing wrong? Thank you in advance

import json
import sys
from web3 import Web3

bsc = "https://bsc-dataseed.binance.org/"
web3 = Web3(Web3.HTTPProvider(bsc))
print(web3.isConnected())


"0x3c7eeddcff188a8c36f1cac1b62958c6e0c27dea"  # G2 already approved
"0xcc5667333f5e997ac9f0c26d41b7dda65b2b675a"  # GloryDoge not approved

contract = "0x3c7eeddcff188a8c36f1cac1b62958c6e0c27dea"  # Contract
contract = web3.toChecksumAddress(contract)
abi = [
    {
        "constant": True,
        "inputs": [
            {"name": "_owner", "type": "address"},
            {"name": "_spender", "type": "address"},
        ],
        "name": "allowance",
        "outputs": [{"name": "", "type": "uint256"}],
        "payable": False,
        "stateMutability": "view",
        "type": "function",
    },
]
contract = web3.eth.contract(address=contract, abi=abi)

_owner = web3.toChecksumAddress(MYADRESS)
_spender = web3.toChecksumAddress(
    "0xbb4cdb9cbd36b01bd1cbaebf2de08d9173bc095c"
)  # WBNB

x = contract.functions.allowance(_owner, _spender).call()

print(x)

Answer 1

Your code works fine!

Insead of filling in the wbnb token address for _spender, you should give the address of the thing you gave the allowance to. For instance, the pancake router address "0x10ED43C718714eb63d5aA57B78B54704E256024E".

You can check which address you gave allowance to by looking at the approve transaction in bscscan.com

Click on "click to see more", and click on "Decode Input Data".

You will see the spender address that you approved.