# 记录一次失败的白名单Mint

By [plsdm7](https://paragraph.com/@dogsuisui) · 2022-12-19

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不想多说代码贴上。

                                                                                                    import { Alchemy, Network, AlchemySubscription } from "alchemy-sdk";																									
    import Web3 from "web3"																									
                                                                                                        
    const rpcURL = "https://arb-mainnet.g.alchemy.com/v2/vDHAR2QADrZE_MWvAbSrGIrWa0--plsN"																									
                                                                                                        
    const web3 = new Web3(rpcURL)																									
    const address = "0xDac752245d44f396630C84394E5dB9B5dE6614dD"																																																	
                                                                                                        
    const account = web3.eth.accounts.privateKeyToAccount("private key")																									
                                                                                                        
    const settings = {																									
    apiKey: "apiKey", // Replace with your Alchemy API Key																									
    network: Network.ARB_MAINNET, // Replace with your network																									
    };																									
                                                                                                        
    const alchemy = new Alchemy(settings);																									
                                                                                                        
    function printTxn(tx) {																									
    if (tx.transaction.to == nftContractAddress) {																																																	
    if (tx.transaction.input.includes("9a76bffd0000000000000000000000000000000000000000000000000000000000000002")) {																									
        minEgg()																									
     }																									
    }																									
    }																									
                                                                                                                                                                                                        
    const nftContractAddress = "0x990eb28e378659b93a29d46ff41f08dc6316dd98"																									
                                                                                                                                                                                                            
    const hackrDaoMintEvents = {																									
    method: AlchemySubscription.MINED_TRANSACTIONS,																									
    }																									
                                                                                                                                                                                                            
     alchemy.ws.on(																									
         hackrDaoMintEvents,																									
       (tx) => printTxn(tx)																									
    );																									
                                                                                                        
    let minted = false																									
                                                                                                                                                                                                        
                                                                                                        
    let es = await web3.eth.getGasPrice()																									
    console.log(es)																									
                                                                                                        
    async function minEgg() {																									
    if (!minted) {																									
    let es = await web3.eth.estimateGas()																									
    console.log(es)																									
    minted = true																									
    let signed = await account.signTransaction({																									
    from: "wallet address",																																																		
    to: '0x990eb28e378659b93a29d46ff41f08dc6316dd98',																									
    gasLimit: 500000,																									
    gasPrice: 20000000000,																									
    data: "0x9a76bffd",																									
    value: web3.utils.toWei("0.043409629044988", "ether")																									
    })																									
    let txn = await web3.eth.sendSignedTransaction(signed.rawTransaction)																									
    console.log(txn)																									
    }																									
    }																									
    

看起来都没毛病，alchemy的接口很好用，我测了一下速度非常也非常快(基本10毫秒以内)，唯一问题是现在arbitrum还不支持pending transation，不过问题也不是很大。

问题来了！！！他妈的我看了之前的请求基本gaslimit都是4十多万，我就随手射了个50万，也没仔细看代码，妈的没想到阿没想到，这个mint阶段二前面好多判断，gaslimit直接就抄了，我他妈循环调用了十几次全失败了，还好这是arb不是eth，gas费还是小事，妈的别人手动都mint到了我自动居然全失败了。。

留作教训，以后gas limit给我狠狠设大一点！！！反正用不完会退，莫名其妙节约了个寂寞。这种不需要构造参数的机会错过了就得等着啦，可惜了~

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*Originally published on [plsdm7](https://paragraph.com/@dogsuisui/mint)*