listing NFTs on OpenSea for sale with Selenium and a Python script

sell.py

# library installation:
# pip3 install -U selenium
# pip3 install webdriver-manager
#
# usage:
# first start Chrome in debug mode:
#   google-chrome --remote-debugging-port=1234
# then:
#   - sign in to MetaMask and select right network and account
#   - connect to OpenSea
# finally start the sell script:
#   python3 sell.py
#
# see here for an example run:
# https://www.youtube.com/watch?v=0B5BIEXcMmI
# needs about 45 seconds per NFT

from selenium import webdriver
from selenium.common.exceptions import NoSuchElementException
from selenium.webdriver.chrome.options import Options
from selenium.webdriver.common.keys import Keys
from selenium.webdriver.support.wait import WebDriverWait
from selenium.webdriver.support import expected_conditions as ExpectedConditions
from selenium.webdriver.common.by import By
from selenium.webdriver.chrome.service import Service
from webdriver_manager.chrome import ChromeDriverManager
import time

# connect to Chrome
options = Options()
options.add_experimental_option("debuggerAddress", "127.0.0.1:1234")
driver = webdriver.Chrome(service=Service(ChromeDriverManager().install()), options=options)

# maximum number of NFTs to sell
count_max = 4

# start token number
token = 18

# price in ETH
price = "0.01"

def switch_to_metamask():
    for handle in driver.window_handles:
        driver.switch_to.window(handle)
        time.sleep(0.1)
        if 'MetaMask' in driver.title:
            break

# load each NFT, and sell it, if it is available for selling
wait = WebDriverWait(driver, 60)
count = 0
while True:
    try:
        print(f"testing token {token} for sale")

        # load page. This waits until the page is loaded
        driver.get(f"https://opensea.io/assets/matic/0x02f21ae7c6aac7015664f27c74bf680649af6201/{token}")

        # wait a bit until all asynchronous calls are done
        time.sleep(3)

        # get and click the sell button. Generates an exception, if there is no sell button
        sell_button = driver.find_element(by=By.XPATH, value='//a[normalize-space()="Sell"]')
        sell_button.click()
        time.sleep(3)

        # set price and click "Complete listing" button
        driver.find_element(by=By.NAME, value='price').send_keys(price)
        driver.find_element(by=By.XPATH, value='//button[normalize-space()="Complete listing"]').click()
        time.sleep(3)

        # click sign button
        driver.find_element(by=By.XPATH, value='//button[normalize-space()="Sign"]').click()

        # wait until MetaMask window is opened
        timeout = 10
        while True:
            if len(driver.window_handles) == 2:
                break
            time.sleep(1)
            timeout -= 1
            if timeout == 0:
                print("timeout")
                break
        time.sleep(2)

        # switch to MetaMask window
        switch_to_metamask()

        # wait until sign message is visible
        sign_message_path = '//span[@class="signature-request-message--node-label"]'
        wait.until(ExpectedConditions.presence_of_element_located((By.XPATH, sign_message_path)))
        time.sleep(0.1)

        # select MetaMask sign message, and scroll down to enable sign button
        switch_to_metamask()
        time.sleep(0.1)
        msg = driver.find_element(by=By.XPATH, value=sign_message_path)
        msg.click()
        page = driver.find_element(by=By.XPATH, value='/*')
        for i in range(10):
            page.send_keys(Keys.PAGE_DOWN)
            time.sleep(0.1)
        time.sleep(0.1)

        # click MetaMask sign button
        driver.find_element(by=By.XPATH, value='//button[normalize-space()="Sign"]').click()

        # wait until MetaMask window is closed
        timeout = 10
        while True:
            if len(driver.window_handles) == 1:
                break
            time.sleep(1)
            timeout -= 1
            if timeout == 0:
                print("timeout")
                break
        time.sleep(1)

        # switch to main window
        driver.switch_to.window(driver.window_handles[0])
        time.sleep(1)

        # check for end
        count += 1
        if count == count_max:
            break
        print("token offered for sale")

    except NoSuchElementException:
        print("not for sale")

    token += 1


print(f"{count} new tokens offered for sale")