Yes, but it's very slow and will drain the users' battery.
We currently pay
0.000158 XMR per 1Million hashes.
If you have 1 Million visits a month, assume a user makes 30 hashes/s
(mid range laptop) and remains on your site for 5 minutes:
(1000000 visits per month * 30 hashes/s * 5 minutes * 60 seconds)/1000000 *
0.000158 xmr = 1.422 xmr / month.
Payouts happen automatically every few hours, once you've reached the minimum amount of 0.5xmr.
See the documentation.
If your question is not answered in the FAQ above or in the documentation enter your email address and your message below. We will get back to you as soon as possible.