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 if ur trading shitcoins it makes sense to have a dollar pegged shitcoin to swap into for capital you dknt want to degen at the moment ( full disclaimer ive never used usdc)  
 Interesting.

I just don't see the point, when you can just go on and out of shitcoins using the dollar/cash.  
 its a good question, and i think the answer lies in when you add dollars to coinbase, there is like10 days seasoning before you can withdraw it back out. so if you swap into usdc instead of withdrawing, you dont have to wait for it to season in  your bank, then deposit it back into coinbase. its a tool for people that trade shitcoins within an exchange like Coinbase's ecosystem that dont want to deal with delays relating to pegging in and out of fiat. 
 Hmm. interesting. But you always have to wait to peg out back to dollars .  So why not just trade via their US dollar pair?