如何使用 web3 将 BNB 兑换成另一种加密货币？

Question

我想使用 web3 通过 Pancakeswap 将 BNB 兑换成其他代币，所以我遇到了这段似乎是正确的代码：

import time
import config as config
from web3 import Web3
 
PancakeABI = open('pancakeABI','r').read().replace('\n','')
 
bsc="https://bsc-dataseed.binance.org/"
web3 = Web3(Web3.HTTPProvider(bsc))
print(web3.isConnected())
 
#My own address to swap from
sender_address = "YOUR OWN WALLET PUBLIC ADDRESS"
 
#This is global Pancake V2 Swap router address
router_address = "0x10ED43C718714eb63d5aA57B78B54704E256024E"
 
#always spend using Wrapped BNB
#I guess you want to use other coins to swap you can do that, but for me I used Wrapped BNB
spend = web3.toChecksumAddress("0xbb4cdb9cbd36b01bd1cbaebf2de08d9173bc095c")
 
#This is your private key info
private="YOUR OWN WALLET PRIVATE KEY"
 
#Print out your balances just for checking
balance = web3.eth.get_balance(sender_address)
print(balance)
 
humanReadable = web3.fromWei(balance,'ether')
print(humanReadable)
 
#Contract id is the new token we are swaping to
contract_id = web3.toChecksumAddress("THE Contract ID of the destination Token")
 
#Setup the PancakeSwap contract
contract = web3.eth.contract(address=router_address, abi=PancakeABI)
 
nonce = web3.eth.get_transaction_count(sender_address)
 
start = time.time()
print(web3.toWei('0.02','ether'))
 
pancakeswap2_txn = contract.functions.swapExactETHForTokens(
  1074184953676691292, # here setup the minimum destination token you want to have, you can do some math, or you can put a 0 if you don't want to care
  [spend,contract_id],
  sender_address,
  (int(time.time()) + 1000000)
).buildTransaction({
  'from': sender_address,
  'value': web3.toWei(0.02,'ether'),#This is the Token(BNB) amount you want to Swap from
  'gas': 250000,
  'gasPrice': web3.toWei('5','gwei'),
  'nonce': nonce,
})
 
signed_txn = web3.eth.account.sign_transaction(pancakeswap2_txn, private_key=private)
tx_token = web3.eth.send_raw_transaction(signed_txn.rawTransaction)
print(web3.toHex(tx_token))

我遇到的问题是我的 BNB 已发送，但没有到达钱包。所以我的BNB就像“迷路”了。

Answer 1

首先，您需要创建一个将使用 dex 接口的合约 之后，您需要在 javascript 中调用一个函数。