Scrapy - Web scraping returning empty list from crypto exchange site

Question

I usually have success when I web scrape but having trouble with this one. I'm assuming I'm getting blocked or they have security measures.

I'm trying to get the APY rates from https://www.okcoin.com/earn . You don't need an account to login and should be fairly straight forward so here's my code (the xpath I've provided is the table under Other offers):

from requests_html import HTMLSession
from scrapy import Selector

def url_headers(url):
    """
    Creates headers for each url to be scraped.

    param url: webpage for scraping
    :return:
    """

    headers = {
        'User-Agent': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:68.0) Gecko/20100101 Firefox/68.0',
        'Accept': '*/*',
        'Accept-Language': 'en-US,en;q=0.5',
        'Accept-Encoding': 'gzip, deflate',
        'Referer': url
    }

    # Get HTML version of document
    sess = HTMLSession()
    res = sess.get(url, headers=headers)

    # Convert to text and extract whole document
    selector = Selector(text=res.content)
    return selector

sel = url_headers("https://www.okcoin.com/earn")

apy = sel.xpath(
    '/html/body/div[2]/div/div/div/div[2]/div/div/div[3]/div/div[3]'
).extract()

print(apy)