Yes, but it's very slow and will drain the users' battery.
We currently pay
0.000149 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 *
0.000149 xmr = 1.341 xmr / month.
Payouts happen automatically every few hours, once you've reached the minimum amount of 0.5xmr.
See the documentation.
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