DeFi

I want to try borrowing 750 USDC, I have ETH

How much ETH do I need to borrow that amount? 

What's the most user friendly way to make it happen?

morpho? doesn't show estimates until you send ETH and wrap

and in the end, if ETH price goes up, I'd still need to return 750 USDC?

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use aave, and to be safe you'd want double the amount you borrow. So $1500 or more to be extra safe. 
You'll always need to repay the $750 in order to get your eth collateral back.

founder of @chainagent + /agent // makerdao & consensys alum // /base art collector: https://gallery.so/seanwbren/galleries/2kqvDWKmo5jfI14j4dlq77Ov2EY

You don’t really know on aave bcos the interest rate fluctuates depending on demand. You can check the current rate on the website but it is possible for it to change 
It’s usually around 4-5%