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USDT USDC 两个稳定币项目开启了测试网

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其中USDC的项目Arc更是融资2.2亿，这不是获得教程，而是测试币跨链信息

最近可有意思了USDC和USDT两家都几乎同时开启了测试网。

USDT Testnet:

本文重点讲USDT测试网，因为太坑了。

这是他的官网文档：https://docs.stable.xyz/en/developers/testnet/funding-guide

第二步你是如何都运行不成功的，因为第一步错了。

你需要mint这个代币USD₮

https://sepolia.etherscan.io/address/0xc4dcc311c028e341fd8602d8eb89c5de94625927#writeContract

为什么我会发现这个问题呢？因为我骂了AI一个小时他都改不对代码，我意识到可能是文档的问题。

他跨链会通过这个合约地址：0xc099cD946d5efCC35A99D64E808c1430cEf08126

我发现了一个用户和我一样，重试了多次也错误了多次，但是最后一次他成功了，原因的他发送了USD₮这个代币。然后顺藤摸瓜，发现教程的第一步就错了，后面不可能成功的。

第三步官方也有问题，他使用错误了浏览器，该合约在那个浏览器没有开源。去官方DC里面问，然后得到这个地址：

https://blockscout.testnet.stable.xyz/address/0xcAB8F3ed8528655E0C2fad1C504c6CfEccf50B90?tab=contract_abi

等待第二步的layerzero testnet执行成功后，再来调用第三步的链接里面的depositTo方法即可。

实际上，几乎所有的交易都被堵在了layerzero testnet上，详情：

https://testnet.layerzeroscan.com/address/0xc099cD946d5efCC35A99D64E808c1430cEf08126

参考跨链py代码：

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import json
from web3 import Web3


# ==============================================================================
# 辅助函数: 将以太坊地址转换为 32 字节的 bytes32 格式
# 这在与需要 bytes32 类型地址参数的 LayerZero 合约交互时非常常用。
# ==============================================================================
def addr_to_32_bytes(addr: str) -> bytes:
    """
    将一个标准的以太坊地址 (20字节) 转换为 32字节 的表示形式。

    Args:
        addr (str): 输入的以太坊地址字符串，例如 "0x..."

    Returns:
        bytes: 转换后的 32字节 bytes 对象。
    """
    # 1. 使用 Web3.to_checksum_address 确保地址格式正确，并去掉 "0x" 前缀
    hex_20 = Web3.to_checksum_address(addr)[2:]
    # 2. 在左侧用 "0" 填充，直到总长度为 64 个字符 (32 字节 * 2 个十六进制字符/字节)
    padded = hex_20.zfill(64)
    # 3. 将填充后的十六进制字符串转换为 bytes 对象
    return bytes.fromhex(padded)


# ==============================================================================
# 主函数
# ==============================================================================
def main():
    # --- 1. 连接到以太坊网络 ---
    # !! 注意：请将 YOUR_INFURA_PROJECT_ID 替换为您自己的 Infura 项目 ID !!
    sepolia_rpc_url = "https://blockchain.googleapis.com/v1/projects/constant-rig-425116-j4/locations/us-central1/endpoints/ethereum-sepolia/rpc?key=AIzaSyCjLfQQq3AToHjT5OF62yXzIrMjh0Nreyk"
    w3 = Web3(Web3.HTTPProvider(sepolia_rpc_url))

    # 检查连接是否成功
    if not w3.is_connected():
        print("错误：无法连接到以太坊节点！请检查您的 RPC URL。")
        return

    print(f"成功连接到链 ID: {w3.eth.chain_id}")

    # --- 2. 设置账户 ---
    # 从环境变量中安全地加载你的私钥
    private_key = "0x你的私钥

    # 根据私钥创建账户对象
    owner = w3.eth.account.from_key(private_key)
    print(f"操作账户地址: {owner.address}")

    # --- 3. 定义常量和地址 ---
    SEPOLIA_USDT0 = Web3.to_checksum_address("0xc4DCC311c028e341fd8602D8eB89c5de94625927")
    SEPOLIA_USDT0_OAPP = Web3.to_checksum_address("0xc099cD946d5efCC35A99D64E808c1430cEf08126")
    RECEIVER_EID = 40374  # 目标链的 LayerZero 端点ID

    # --- 4. 定义合约 ABI ---
    # ERC20 的最小化 ABI，包含 approve 和 balanceOf
    ERC20_ABI = json.dumps([
        {"constant": False, "inputs": [{"name": "_spender", "type": "address"}, {"name": "_value", "type": "uint256"}],
         "name": "approve", "outputs": [{"name": "", "type": "bool"}], "payable": False,
         "stateMutability": "nonpayable", "type": "function"},
        {"constant": True, "inputs": [{"name": "_owner", "type": "address"}], "name": "balanceOf",
         "outputs": [{"name": "balance", "type": "uint256"}], "payable": False, "stateMutability": "view",
         "type": "function"}
    ])

    # OFTAdapter 实现合约的正确 ABI (从 Etherscan 获取)
    # 注意：我们与代理合约地址交互，但需要使用实现合约的ABI
    OFT_ADAPTER_ABI = """
    [
        {"inputs":[{"components":[{"internalType":"uint32","name":"dstEid","type":"uint32"},{"internalType":"bytes32","name":"to","type":"bytes32"},{"internalType":"uint256","name":"amountLD","type":"uint256"},{"internalType":"uint256","name":"minAmountLD","type":"uint256"},{"internalType":"bytes","name":"extraOptions","type":"bytes"},{"internalType":"bytes","name":"composeMsg","type":"bytes"},{"internalType":"bytes","name":"oftCmd","type":"bytes"}],"internalType":"struct SendParam","name":"_sendParam","type":"tuple"},{"internalType":"bool","name":"_payInLzToken","type":"bool"}],"name":"quoteSend","outputs":[{"components":[{"internalType":"uint256","name":"nativeFee","type":"uint256"},{"internalType":"uint256","name":"lzTokenFee","type":"uint256"}],"internalType":"struct MessagingFee","name":"fee","type":"tuple"}],"stateMutability":"view","type":"function"},
        {"inputs":[{"components":[{"internalType":"uint32","name":"dstEid","type":"uint32"},{"internalType":"bytes32","name":"to","type":"bytes32"},{"internalType":"uint256","name":"amountLD","type":"uint256"},{"internalType":"uint256","name":"minAmountLD","type":"uint256"},{"internalType":"bytes","name":"extraOptions","type":"bytes"},{"internalType":"bytes","name":"composeMsg","type":"bytes"},{"internalType":"bytes","name":"oftCmd","type":"bytes"}],"internalType":"struct SendParam","name":"_sendParam","type":"tuple"},{"components":[{"internalType":"uint256","name":"nativeFee","type":"uint256"},{"internalType":"uint256","name":"lzTokenFee","type":"uint256"}],"internalType":"struct MessagingFee","name":"_fee","type":"tuple"},{"internalType":"address","name":"_refundAddress","type":"address"}],"name":"send","outputs":[{"components":[{"internalType":"bytes32","name":"guid","type":"bytes32"},{"internalType":"uint64","name":"nonce","type":"uint64"},{"internalType":"uint32","name":"eid","type":"uint32"}],"internalType":"struct MsgReceipt","name":"","type":"tuple"}],"stateMutability":"payable","type":"function"}
    ]
    """

    # --- 5. 创建合约实例 ---
    usdt0_contract = w3.eth.contract(address=SEPOLIA_USDT0, abi=ERC20_ABI)
    oft_adapter_contract = w3.eth.contract(address=SEPOLIA_USDT0_OAPP, abi=OFT_ADAPTER_ABI)

    # --- 6. 授权 (Approve) ---
    # 授权 OFTAdapter 合约可以从我们的账户中提取指定数量的 USDT
    amount_to_send = w3.to_wei(1, 'ether')  # 将 1 个 ether 单位转换为 wei (10^18)

    print(f"准备授权合约 {SEPOLIA_USDT0_OAPP} 使用 {w3.from_wei(amount_to_send, 'ether')} USDT...")

    # 构造 approve 交易
    approve_tx = usdt0_contract.functions.approve(
        SEPOLIA_USDT0_OAPP,
        amount_to_send
    ).build_transaction({
        'from': owner.address,
        'nonce': w3.eth.get_transaction_count(owner.address),
        'gas': 200000,  # Gas limit，对于 approve 通常足够
        'gasPrice': w3.eth.gas_price
    })

    # 签名并发送交易
    signed_approve_tx = w3.eth.account.sign_transaction(approve_tx, private_key)
    approve_tx_hash = w3.eth.send_raw_transaction(signed_approve_tx.raw_transaction)

    # 等待交易确认
    print(f"Approve 交易已发送, 哈希: {approve_tx_hash.hex()}")
    w3.eth.wait_for_transaction_receipt(approve_tx_hash)
    print("✅ Approve 交易成功！")

    # --- 7. 准备 LayerZero send 参数 ---
    # `Options.newOptions().addExecutorLzReceiveOption(0, 0).toBytes()` 在JS中生成的字节串
    # 这个值表示在目标链上不为执行交易额外提供gas (gas=0, value=0)
    options = bytes.fromhex("00030100110100000000000000000000000000000000")

    # 构建 send 函数需要的参数结构体，使用字典方便阅读
    send_params = {
        "dstEid": RECEIVER_EID,
        "to": addr_to_32_bytes(owner.address),  # 将接收者地址转换为 bytes32
        "amountLD": amount_to_send,
        "minAmountLD": amount_to_send,
        "extraOptions": options,
        "composeMsg": b"",  # 空字节字符串
        "oftCmd": b"",  # 空字节字符串
    }

    # --- 8. 获取跨链费用 (quoteSend) ---
    print("\n正在获取跨链费用...")
    # 调用合约函数时，如果参数是结构体，web3.py 需要传入一个列表或元组
    fee_struct = oft_adapter_contract.functions.quoteSend(
        list(send_params.values()),  # 将字典的值按顺序转为列表
        False  # _payInLzToken 参数
    ).call()

    # fee_struct 是一个元组，格式为 (nativeFee, lzTokenFee)
    native_fee = fee_struct[0]
    print(f"获取到预估的原生代币费用: {w3.from_wei(native_fee, 'ether')} ETH")

    # --- 9. 执行跨链发送 (send) ---
    print("\n准备执行跨链发送...")

    # 构造 send 交易
    send_tx = oft_adapter_contract.functions.send(
        list(send_params.values()),  # 第一个参数：_sendParam 结构体
        fee_struct,  # 第二个参数：_fee 结构体
        owner.address  # 第三个参数：_refundAddress
    ).build_transaction({
        'from': owner.address,
        'value': native_fee,  # 交易的 msg.value，用于支付跨链费用
        'nonce': w3.eth.get_transaction_count(owner.address),
        'gas': 3500000,  # 跨链交易通常需要更高的 gas limit
        'gasPrice': w3.eth.gas_price
    })

    # 签名并发送交易
    signed_send_tx = w3.eth.account.sign_transaction(send_tx, private_key)
    send_tx_hash = w3.eth.send_raw_transaction(signed_send_tx.raw_transaction)

    # 等待交易确认
    print(f"Send 交易已发送, 哈希: {send_tx_hash.hex()}")
    w3.eth.wait_for_transaction_receipt(send_tx_hash)
    print("✅ 跨链 Send 交易成功！")


if __name__ == "__main__":
    main()

USDC Testnet:

跨链工具：https://www.npmjs.com/package/create-bridge-kit

该工具开发者推特：@realchriswilder

使用方法：

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npx create-bridge-kit my-bridge-app
cd my-bridge-app
npm install
npm run dev