OptionalbuyFixed amount of buyCurrency to receive, as a decimal string. Specify exactly one of sellAmount / buyAmount.
Asset you are converting TO, e.g. "USDC". Required.
OptionalsellFixed amount of sellCurrency to spend, as a decimal string. Specify exactly one of sellAmount / buyAmount.
Asset you are converting FROM, e.g. "USDT". Required.
Inputs for requesting a conversion quote. Specify EXACTLY ONE of
sellAmount/buyAmount.