Here’s a small and simple guide on how you can exchange POLY to XTZ on Changelly:
• Select the two cryptocurrencies and enter the amount of crypto you wish to swap in the exchange window.
• Choose either fixed or floating rates.
• Enter your XTZ wallet address.
• Send the exact amount of crypto required to the wallet address that will be displayed on the screen. Please do it in a single transaction.
And you’re done! Your new Tezos will be in your wallet shortly.