Каждый раз quoteExactOutput показывает сумму, немного превышающую ту, которая фактически получена в менять. Эта разница может составлять 0,1%, а может достигать 2%. Эта неточность возникает в пулах с разным процентом (0,01, 0,05, 0,3, 1).
Например:
Первый обмен монеты на эфир в пул 0,05:
quoteExactOutput -> 0,00004094
на самом деле получилось -> 0,00004090
разница: 0,1%
Второй обмен сразу после первого:
quoteExactOutput -> 0.00004094
фактически получено -> 0.00004090< /p>
разница: 0,1%
Код: Выделить всё
from web3 import Account, Web3
from abi import UNISWAP_V3_QUOTER2_ABI, UNISWAP_V3_ROUTER2_ABI, WETH9_ABI, MIN_ERC20_ABI
import eth_abi.packed
private_key = "pppppppppppppppppppppppppppppppppppppppppppppppppppp"
rpc_endpoint = "https://arb1.arbitrum.io/rpc"
web3 = Web3(Web3.HTTPProvider(rpc_endpoint))
account = Account.from_key(private_key)
weth_address = web3.to_checksum_address("0x82aF49447D8a07e3bd95BD0d56f35241523fBab1")
link_address = web3.to_checksum_address("0xf97f4df75117a78c1a5a0dbb814af92458539fb4")
swap_router02_address = web3.to_checksum_address("0x68b3465833fb72A70ecDF485E0e4C7bD8665Fc45")
# load contracts
swap_router_contract = web3.eth.contract(address=swap_router02_address, abi=UNISWAP_V3_ROUTER2_ABI)
weth_contract = web3.eth.contract(address=weth_address, abi=WETH9_ABI)
link_contract = web3.eth.contract(address=link_address, abi=MIN_ERC20_ABI)
# finding out how many WETH I can get
UNISWAP_v3_QUOTER2_ADDRESS = "0x61fFE014bA17989E743c5F6cB21bF9697530B21e"
quoter2_contract = web3.eth.contract(address=UNISWAP_v3_QUOTER2_ADDRESS, abi=UNISWAP_V3_QUOTER2_ABI)
amount_in = 1_0000_0000_0000_0000 # 1 == 1_00_0000_0000_0000_0000 Link
path = eth_abi.packed.encode_packed(['address', 'uint24', 'address'], [link_address,500,weth_address])
amount_out, sqrtPriceX96After, initializedTicksCrossed, gasEstimate = quoter2_contract.functions.quoteExactOutput(path, amount_in).call()
print(f"for {amount_in / 10 ** 18} T1 you would get {amount_out / 10 ** 18} WETH")
# swap
path = eth_abi.packed.encode_packed(['address','uint24','address'], [link_address,500,weth_address])
tx_params = (
path,
account.address,
amount_in, # amount in
0 #min amount out
)
swap_buy_tx = swap_router_contract.functions.exactInput(tx_params).build_transaction(
{
'from': account.address,
'gas': 1500000,
'maxPriorityFeePerGas': web3.eth.max_priority_fee,
'maxFeePerGas': 80000000,
'nonce': web3.eth.get_transaction_count(account.address),
})
raw_transaction = web3.eth.account.sign_transaction(swap_buy_tx, account.key).rawTransaction
print(f"raw transaction: {raw_transaction}")
tx_hash = web3.eth.send_raw_transaction(raw_transaction)
tx_receipt = web3.eth.wait_for_transaction_receipt(tx_hash)
print(f"tx hash: {Web3.to_hex(tx_hash)}")
Подробнее здесь: https://stackoverflow.com/questions/787 ... t-quantity
