Like-kind exchange doesn't apply to cryptocurrencies. Exchanging BTC for a stablecoin does trigger capital gains as does selling a stablecoin for fiat. In the BTC-USDC scenario it is a little trickier to calculate the basis in USD but capital gains taxes still apply.
Yes, if you record the USD value of both sides at the time of trade. If you only record the execution price of your BTC/USDT trade you will need to later find the price of BTC/USD and USDT/USD at the time of execution.
Trickier in the sense that it requires more attention than simply recording the execution price and fees of a BTC/USD trade.
Most charting and accounting services do this for any time period if you need to look it up, or do it automatically
Only more annoying when you have to use an AMM’s info site and the chart isnt very granular or go back far enough. Pancakeswap’s info site doesnt even work.
So yes best to keep track at that exact time of trade
