2025-04-14

[MtkN1]

Today I Learned ...

[MtkN1]

Web3.py Uniswap 見積もりコード

from web3 import Web3

# Ethereumノードへの接続設定（InfuraプロジェクトIDを入力）
provider_url = "https://mainnet.zkevm.cronos.org/"
w3 = Web3(Web3.HTTPProvider(provider_url))

# コネクション確認
if not w3.is_connected():
    raise ConnectionError("Ethereumノードへの接続に失敗しました")

# トークンとルーターのアドレス設定
WETH_ADDRESS = Web3.to_checksum_address("0xBCaA34FF9D5BFD0d948b18Cf6Bf39a882F4a1cBD")
USDC_ADDRESS = Web3.to_checksum_address("0xC1bF55EE54E16229d9b369a5502Bfe5fC9F20b6d")
UNISWAP_V2_ROUTER = Web3.to_checksum_address(
    "0x39aD8C3067281e60045DF041846EE01c1Dd3a853"
)

# Uniswap V2ルーターABI（getAmountsOut用）
router_abi = [
    {
        "inputs": [
            {"internalType": "uint256", "name": "amountIn", "type": "uint256"},
            {"internalType": "address[]", "name": "path", "type": "address[]"},
        ],
        "name": "getAmountsOut",
        "outputs": [
            {"internalType": "uint256[]", "name": "amounts", "type": "uint256[]"}
        ],
        "stateMutability": "view",
        "type": "function",
    }
]

# コントラクトインスタンス作成
router_contract = w3.eth.contract(address=UNISWAP_V2_ROUTER, abi=router_abi)

# スワップパス設定（ETH→WETH→USDC）
swap_path = [WETH_ADDRESS, USDC_ADDRESS]

# スワップするETHの量（1 ETH = 10^18 wei）
amount_eth = 10 * 10**8

try:
    # スワップ結果を取得
    amounts_out = router_contract.functions.getAmountsOut(amount_eth, swap_path).call()

    if len(amounts_out) >= 2:
        usdc_amount = amounts_out[-1] / 10**18  # USDCの小数桁数（6桁）で割る
        print(f"1 ETH = {usdc_amount:,} USDC")
        print(amounts_out[0] / 10**8)
    else:
        print("想定外のデータ形式です。パスを確認してください")

except Exception as e:
    print(f"エラーが発生しました: {e}")