Script for making an offer on looksrare

make-offer-looksrare.js

const https = require('https')
const { Wallet } = require('ethers')
const {
  addressesByNetwork,
  SupportedChainId,
  generateMakerOrderTypedData,
} = require('@looksrare/sdk')
require('dotenv').config()

const WALLET_PRIVATE_KEY = process.env.WALLET_PRIVATE_KEY
const LOOKSRARE_API_KEY = process.env.LOOKSRARE_API_KEY
const signerAddress = "0x5E113EDC0eaf00699889FC510DB121308bBA1261"
const contractAddress = "0x3A112D86899578E63b373B6D09322E18Aed924Cb"
const price = "1000000000000000"
const tokenId = "4946"
const validity = 30

async function makeOffer(opt) {
  const data = JSON.stringify(opt)
  const options = {
    hostname: 'api.looksrare.org',
    port: 443,
    path: '/api/v1/orders',
    method: 'POST',
    headers: {
      'Content-Type': 'application/json',
      'Content-Length': data.length,
      "X-API-KEY": LOOKSRARE_API_KEY
    },
  }
  return new Promise((resolve, reject) => {
    const req = https.request(options, (res) => {
      res.on('data', (data) => {
        data = JSON.parse(data)
        resolve(data)
      })
    })
    req.on('error', (error) => {
      reject(JSON.parse(error))
    })
    req.write(data)
    req.end()
  })
}

async function getUserNonce(signerAddress) {
  const options = {
    hostname: 'api.looksrare.org',
    port: 443,
    path: `/api/v1/orders/nonce?address=${signerAddress}`,
  }
  return new Promise((resolve, reject) => {
    const req = https.get(options, (res) => {
      res.on('data', (data) => {
        data = JSON.parse(data)
        resolve(data.data)
      })
    })
    req.on('error', (error) => {
      reject(JSON.parse(error))
    })
    req.end()
  })
}

async function main(
  signerAddress,
  contractAddress,
  price,
  tokenId,
  validity,
  WALLET_PRIVATE_KEY
) {
  const chainId = SupportedChainId.MAINNET
  const addresses = addressesByNetwork[chainId]
  const nonce = await getUserNonce(signerAddress) // Fetch from the api

  const now = Math.floor(Date.now() / 1000)
  const paramsValue = []

  // This variable is used to enforce a max slippage of 25% on all orders, if a collection change the fees to be >25%, the order will become invalid
  const minNetPriceRatio = 7500

  const makerOrder = {
    isOrderAsk: false,
    signer: signerAddress,
    collection: contractAddress,
    price,
    tokenId,
    amount: '1',
    strategy: addresses.STRATEGY_STANDARD_SALE,
    currency: addresses.WETH,
    nonce: nonce,
    startTime: now,
    endTime: now + 86400 * validity,
    minPercentageToAsk: minNetPriceRatio,
    params: paramsValue,
  }
  const signer = new Wallet(WALLET_PRIVATE_KEY)
  const { domain, value, type } = generateMakerOrderTypedData(
    signerAddress,
    chainId,
    makerOrder
  )
  const signature = await signer._signTypedData(domain, type, value)
  const res = await makeOffer({ ...makerOrder, signature })
  console.log(res)
}

main(
  signerAddress,
  contractAddress,
  price,
  tokenId,
  validity,
  WALLET_PRIVATE_KEY
)