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That link doesn't work. At https://www.paypal.com/us/webapps/mpp/merchant-fees, I see 2.9% + $0.30, for in-U.S. transactions done in dollars.

It did work yesterday... Here's another one: https://www.paypal.com/ca/business/fees

Would this be applicable only to businesses in Canada?

There are higher cross-border fees in the U.S. too. I don't know how this compares to the competition.