gistfile1.txt

const axios = require('axios')

const apiKey = 'YOUR-ETHERSCAN-API-KEY'
const address = '0xb27e3af4eb6e40007b5f74a635b9d5fb6c4887ec'
const urlBase = 'https://api-goerli.etherscan.io/api'

async function txlist(address) {
    const url = `${urlBase}?module=account&action=txlist&address=${address}&startblock=0&endblock=99999999&sort=asc&apikey=${apiKey}`
    const response = await axios.get(url)
    return response.data.result
}

async function getTransactionByHash(hash) {
    const url = `${urlBase}?module=proxy&action=eth_getTransactionByHash&txhash=${hash}&apikey=${apiKey}`
    const response = await axios.get(url)
    return response.data.result
}

async function ethAddressToPubKey(address) {
    const result = await txlist(address)
    const outgoingTx = result.find(tx => tx.from == address)
    const txHash = outgoingTx.hash
    const txData = await getTransactionByHash(txHash)
    return txData.publicKey
}

ethAddressToPubKey(address).then(publicKey => console.log(publicKey))