3)
--who can trade on Blockfolio?
Both US and international users can!
--what does Blockfolio offer?
Crypto, fiat, and--in some jurisdictions--stocks!
--what fiat does Blockfolio have?
Fast USD, BRL, AUD, and EUR (SEPA)
(JK--jurisdictions allowed to trade stocks on Blockfolio can buy AND sell, of course.)
--which jurisdictions?
For now, just some, but it'll expand to all international users soon. And, in a few months, maybe...