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分步指南

1

请求报价或路由

const getQuote = async (fromChain, toChain, fromToken, toToken, fromAmount, fromAddress) => {
    const result = await axios.get('https://li.quest/v1/quote', {
        params: {
            fromChain,
            toChain,
            fromToken,
            toToken,
            fromAmount,
            fromAddress,
        }
    });
    return result.data;
}

const fromChain = 'DAI';
const fromToken = 'USDC';
const toChain = 'POL';
const toToken = 'USDC';
const fromAmount = '1000000';
const fromAddress = YOUR_WALLET_ADDRESS;

const quote = await getQuote(fromChain, toChain, fromToken, toToken, fromAmount, fromAddress);
2

如果使用了 `/routes`，选择所需的路由并从 `/advanced/stepTransaction` 检索交易数据

只有在使用了 /routes 端点时才需要此步骤。/quote 已在响应中返回交易数据。/quote 和 /routes 之间的区别在这里描述
3

设置授权额度

在发送任何交易之前，必须确保用户被允许从钱包发送请求的金额。
const { Contract } = require('ethers');

const ERC20_ABI = [
    {
        "name": "approve",
        "inputs": [
            {
                "internalType": "address",
                "name": "spender",
                "type": "address"
            },
            {
                "internalType": "uint256",
                "name": "amount",
                "type": "uint256"
            }
        ],
        "outputs": [
            {
                "internalType": "bool",
                "name": "",
                "type": "bool"
            }
        ],
        "stateMutability": "nonpayable",
        "type": "function"
    },
    {
        "name": "allowance",
        "inputs": [
            {
                "internalType": "address",
                "name": "owner",
                "type": "address"
            },
            {
                "internalType": "address",
                "name": "spender",
                "type": "address"
            }
        ],
        "outputs": [
            {
                "internalType": "uint256",
                "name": "",
                "type": "uint256"
            }
        ],
        "stateMutability": "view",
        "type": "function"
    }
];

// 获取当前授权额度并在需要时更新
const checkAndSetAllowance = async (wallet, tokenAddress, approvalAddress, amount) => {
    // 原生代币的交易不需要批准
    if (tokenAddress === ethers.constants.AddressZero) {
        return
    }

    const erc20 = new Contract(tokenAddress, ERC20_ABI, wallet);
    const allowance = await erc20.allowance(await wallet.getAddress(), approvalAddress);

    if (allowance.lt(amount)) {
        const approveTx = await erc20.approve(approvalAddress, amount);
        await approveTx.wait();
    }
}

await checkAndSetAllowance(wallet, quote.action.fromToken.address, quote.estimate.approvalAddress, fromAmount);
4

发送交易

收到报价后，必须发送交易以触发转账。首先，必须配置钱包。以下示例将您的钱包连接到 Gnosis 链。
const provider = new ethers.providers.JsonRpcProvider('https://rpc.xdaichain.com/', 100);
const wallet = ethers.Wallet.fromMnemonic(YOUR_PERSONAL_MNEMONIC).connect(
    provider
);
之后，可以使用先前检索到的报价中的 transactionRequest 发送交易：
const tx = await wallet.sendTransaction(quote.transactionRequest);
await tx.wait();
5

如果适用，执行第二步

如果使用了两步路由，则必须在第一步完成后执行第二步。像下一步中描述的那样获取第一步的状态，然后从 /advanced/stepTransaction 端点请求交易数据。
6

获取转账状态

要检查代币是否成功发送到接收链，可以调用 /status 端点：
const getStatus = async (bridge, fromChain, toChain, txHash) => {
    const result = await axios.get('https://li.quest/v1/status', {
        params: {
            bridge,
            fromChain,
            toChain,
            txHash,
        }
    });
    return result.data;
}

result = await getStatus(quote.tool, fromChain, toChain, tx.hash);

​
完整示例

const ethers = require('ethers');
const axios = require('axios');

const API_URL = 'https://li.quest/v1';

// 获取您想要的转账报价
const getQuote = async (fromChain, toChain, fromToken, toToken, fromAmount, fromAddress) => {
    const result = await axios.get(`${API_URL}/quote`, {
        params: {
            fromChain,
            toChain,
            fromToken,
            toToken,
            fromAmount,
            fromAddress,
        }
    });
    return result.data;
}

// 检查您的转账状态
const getStatus = async (bridge, fromChain, toChain, txHash) => {
    const result = await axios.get(`${API_URL}/status`, {
        params: {
            bridge,
            fromChain,
            toChain,
            txHash,
        }
    });
    return result.data;
}

const fromChain = 'DAI';
const fromToken = 'USDC';
const toChain = 'POL';
const toToken = 'USDC';
const fromAmount = '1000000';
const fromAddress = YOUR_WALLET_ADDRESS;

// 设置您的钱包
const provider = new ethers.providers.JsonRpcProvider('https://rpc.xdaichain.com/', 100);
const wallet = ethers.Wallet.fromMnemonic(YOUR_PERSONAL_MNEMONIC).connect(
    provider
);

const run = async () => {
    const quote = await getQuote(fromChain, toChain, fromToken, toToken, fromAmount, fromAddress);
    const tx = await wallet.sendTransaction(quote.transactionRequest);

    await tx.wait();

    // 仅跨链转账需要
    if (fromChain !== toChain) {
        let result;
        do {
            result = await getStatus(quote.tool, fromChain, toChain, tx.hash);
        } while (result.status !== 'DONE' && result.status !== 'FAILED')
    }
}

run().then(() => {
    console.log('DONE!')
});
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