Currently, there is a single opportunity to purchase tokens but it is only available in limited areas and for a limited time during August 11-18, 2020. You can find more information about this at https://coinlist.co/near (the page is geoblocked outside of eligible geographies).
Any sale not offered through that link (eg. the fake Uniswap listing) is probably a scam.
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Note: Be very careful about scams! People have already tried to impersonate team members on Telegram and set up fake ICOs. Verify the website domain on forms like this one (near.org). Any future offerings will only be done through well known platforms or counterparties and will have clear information posted on either this page or elsewhere on the website.