I'm new to Bitfinex - I'm non-US citzen - is it possible to just send btc to the exchange,
sell it for USD and lend this amount of USD out for margin traders?
The way back would obviously be, buying bitcoin with usd and transfering btc back to a private wallet.
Is that possible? Or do you always have to wire usd to your funding wallet?
Thanks.
It's possible, that's what I plan to do.
It's actually much harder if you are a US resident as Bitfinex are no longer verifying accounts for new US based customers. You can do what you suggested there without any need to have your account verified so they don't really care where you are.