Coinbase API/SDK for converting USD to USDC without fees

Hello!
I want to use some API/SDK of Coinbase in my dapp for converting USD to USDC without fees for Polygon network, like in Coinbase web-site. But that should be handled without creating a Coinbase wallet, just to convert from USD to USDC to some blockchain address and back(I know it can be with fees depending on ‘net conversion’). Is there some API or SDK that suits my request?
I was looking at Pay SDK, but I couldn’t find any info regarding to free-fees for that USD/USDC kind of conversion.

Really looking forward to the answer. Thanks!

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