check_approval.py

"""
Check if relayer is approved for token spending
"""
from web3 import Web3
import os

# BSC Mainnet
RPC_URL = "https://bsc-dataseed1.binance.org"
w3 = Web3(Web3.HTTPProvider(RPC_URL))

# Addresses
USD1_TOKEN = "0x8d0d000ee44948fc98c9b98a4fa4921476f08b0d"
RELAYER = "0xE1C2830d5DDd6B49E9c46EbE03a98Cb44CD8eA5a"

# ERC-20 ABI (minimal)
ERC20_ABI = [
    {
        "constant": True,
        "inputs": [
            {"name": "owner", "type": "address"},
            {"name": "spender", "type": "address"}
        ],
        "name": "allowance",
        "outputs": [{"name": "", "type": "uint256"}],
        "type": "function"
    }
]

def check_approval(wallet_address: str, token_address: str = USD1_TOKEN, spender: str = RELAYER):
    """Check if spender is approved to spend tokens from wallet"""

    token = w3.eth.contract(address=Web3.to_checksum_address(token_address), abi=ERC20_ABI)

    allowance = token.functions.allowance(
        Web3.to_checksum_address(wallet_address),
        Web3.to_checksum_address(spender)
    ).call()

    print(f"Wallet: {wallet_address}")
    print(f"Token: {token_address} (USD1)")
    print(f"Spender: {spender} (B402 Relayer)")
    print(f"Allowance: {allowance}")

    if allowance > 0:
        print(f"✅ Approved! Can spend up to {allowance / 10**18:.2f} USD1")
        return True
    else:
        print("❌ Not approved. Need to approve relayer first.")
        return False

if __name__ == "__main__":
    private_key = os.environ.get("PRIVATE_KEY")
    if not private_key:
        print("Set PRIVATE_KEY environment variable")
        exit(1)

    from eth_account import Account
    account = Account.from_key(private_key)

    check_approval(account.address)