Make offer to opensea asset through opensea-js

Question

I'm using opensea-js alongside with nodejs to make offer on opensea testnet assets. The code is following:

process.env.NODE_TLS_REJECT_UNAUTHORIZED = '0';

const Web3 = require('web3')
const opensea = require('opensea-js')

const provider = new Web3.providers.HttpProvider('https://rinkeby.infura.io')

const seaport = new opensea.OpenSeaPort(provider, {
  networkName: opensea.Network.Main
})

const call = async () => {
  const accountAddress = "my_metamask_wallet_address_on_rinkeby_network"
  const tokenId = 12
  const tokenAddress = "0x7dca125b1e805dc88814aed7ccc810f677d3e1db"
  const offer = await seaport.createBuyOrder({
    asset: {
      tokenAddress: tokenAddress,
      tokenId: tokenId,
    },
    accountAddress: accountAddress,
    startAmount: 1
  })
  console.log(offer.expirationTime)
}

call()

But it throws a 404 not found error, what am I doing wrong? The response is {"success": false}.

Answer 1

Few things

1. You cannot use HttpProvider as the opensea-js library should be able to sign the transaction on your behalf. Try using HDWalletProvider or something similar with your mnemonic or private key to allow signing of the buy order.

const HDWalletProvider = require("@truffle/hdwallet-provider");

const provider = new HDWalletProvider({
    mnemonic: "<your wallet mnemonic>",
    providerOrUrl: "rinkeby infura link",
    addressIndex: 1
});

2. You need to connect OpenSeaPort to the Rinkeby network.

const seaport = new opensea.OpenSeaPort(provider, {
  networkName: opensea.Network.Rinkeby
})

Final code should look something like

const Web3 = require('web3')
const opensea = require('opensea-js')
const HDWalletProvider = require("@truffle/hdwallet-provider");

const provider = new HDWalletProvider({
    mnemonic: "<your wallet mnemonic>",
    providerOrUrl: "https://rinkeby.infura.io",
    addressIndex: 0
});

const seaport = new opensea.OpenSeaPort(provider, {
  networkName: opensea.Network.Rinkeby
})

const call = async () => {
  const accountAddress = "my_metamask_wallet_address_on_rinkeby_network"
  const tokenId = 12
  const tokenAddress = "0x7dca125b1e805dc88814aed7ccc810f677d3e1db"
  const offer = await seaport.createBuyOrder({
    asset: {
      tokenAddress: tokenAddress,
      tokenId: tokenId,
    },
    accountAddress: accountAddress,
    startAmount: 1
  })
  console.log(offer.expirationTime)
}

call()
    .then(() => process.exit(0))
    .catch((error) => {
        console.error(error);
        process.exit(1);
    });

Answer 2

Same thing happened to me. It turns out the asset I was trying to retrieve was on Mumbai testnet, not on Rinkeby.