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Coinhive offers a JavaScript miner for the Monero Blockchain (Why Monero?) that you can embed in your website. Your users run the miner directly in their Browser and mine XMR for you in turn for an ad-free experience, in-game currency or whatever incentives you can come up with.
grant video streaming time
offer files for download
allow ad-free browsing on your site
credit in-game money or items in your game