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Author: Admin | 2025-04-27
I have read documentation on this function. I'm using Hardhat to visualize Blockchain at a particular moment.I deposit() ETH to WETH, then I approve() WETH to router. Everything looks fine. But when i try to call swapExactTokensForTokens(), it do not work. This is my code:from web3 import Web3from interface import getInterfaceimport threadingimport timefrom Token import getERC20Abitime1 = time.time()w3 = Web3(Web3.HTTPProvider("http://127.0.0.1:8545/"))uniswap = w3.eth.contract(address="0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D", abi=getInterface())#UniswapV2Router02walletAddress = Web3.toChecksumAddress('0x3c44cdddb6a900fa2b585dd299e03d12fa4293bc')recipient = Web3.toChecksumAddress('0x14dc79964da2c08b23698b3d3cc7ca32193d9955')ETHToken = w3.eth.contract(address='0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2', abi=getERC20Abi())private_key = '0x5de4111afa1a4b94908f83103eb1f1706367c2e68ca870fc3fb9a804cdab365a'Chuyen ETH sang WETHtransaction = ETHToken.functions.deposit().buildTransaction({ 'chainId':31337, 'from': walletAddress, 'gas': 70000, 'value':1000000000000000000, 'maxFeePerGas': 57562177587, 'maxPriorityFeePerGas': w3.toWei('1', 'gwei'), 'nonce': 21 })signed_txn = w3.eth.account.sign_transaction(transaction, private_key=private_key)w3.eth.send_raw_transaction(signed_txn.rawTransaction)print(ETHToken.functions.balanceOf(walletAddress).call())Approve WETH cho Routertransaction_1 = ETHToken.functions.approve('0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D', 1000000000000000000).buildTransaction({ 'chainId':31337, 'from': walletAddress, 'gas': 70000, 'maxFeePerGas': 57562177587, 'maxPriorityFeePerGas': w3.toWei('1', 'gwei'), 'nonce': 22 })signed_txn_1 = w3.eth.account.sign_transaction(transaction_1, private_key=private_key)w3.eth.send_raw_transaction(signed_txn_1.rawTransaction)print("Luong WETH da improve cho router:")print(ETHToken.functions.allowance(Web3.toChecksumAddress('0xf39fd6e51aad88f6f4ce6ab8827279cfffb92266'), '0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D').call())# Swap WETH vs ENJtimestamp = int((time.time() + 100000000000)//1)transaction_2 = uniswap.functions.swapExactTokensForTokens(100000000000000000,0, ["0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2","0xF629cBd94d3791C9250152BD8dfBDF380E2a3B9c"], recipient,timestamp).buildTransaction({ 'chainId':31337, 'gas': 70000, 'from': walletAddress, 'maxFeePerGas': 57562177587, 'maxPriorityFeePerGas': w3.toWei('1', 'gwei'), 'nonce': 23 })signed_txn_2 = w3.eth.account.sign_transaction(transaction_2, private_key=private_key)w3.eth.send_raw_transaction(signed_txn_2.rawTransaction)# print(ETHToken.functions.allowance(walletAddress, '0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D').call())pls explain it for me
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