Ethereum - sign and send raw transaction in batches using infura api

eth-sendRawTransaction.js

var ethers = require('ethers');  
var apiKey = '#yourAPIKey#'; //github is a good source for this :p
var url = `https://goerli.infura.io/v3/${apiKey}`;
var rpc = new ethers.providers.JsonRpcProvider(url);

var privateKey = "#ethPrivateKey#";
var wallet = new ethers.Wallet(privateKey);
console.log("Address: " + wallet.address);

async function main(){
    let transactions = [];
    let tx = {
        to: "0x60C063d3f3B744e2d153FcbE66A068B09109cf1b", //null for contract creation
        value: ethers.utils.parseEther("0.0001"),
        gasLimit: 21000, //72000 for contract creation
        //gasPrice: "0x07f9acf02",
        //gasPrice: 151,//12*10**6,
        nonce: 0+1, // next account nonce (check with etherscan)
        chainId: 5, //goerli
        data: "0xbaadf00d",
        gasPrice: ethers.utils.parseEther("0.0000001"),
        //type:2,
        //maxFeePerGas: 9,
        //maxPriorityFeePerGas: 9,
        
    }

    let start = tx.nonce
    let num  = 1 //
    console.log("--start--")

    for(let i = start; i<start+num; i++){
        tx.nonce = i
        transactions.push(await wallet.signTransaction(tx))
        console.log(transactions[transactions.length -1])
    }

    let ii = 0;
    
    for(let t of transactions){
        rpc.sendTransaction(t)
        ii+=1
        console.log(ii)
    }
    
    console.log("--end--")
    
    /* another way of sending all transactions. doing this twice to make sure all tx go through :p */
    await Promise.allSettled(transactions.map( tsx =>  rpc.sendTransaction(tsx)))


}
main()