take a look on pi website where you can buy Pi Coins: https://minepi.com/kyb-list/

Beware of fake Pi listings on various DEXs. It is important to note that Pi trading pairs currently listed on all DEXs are fraudulent and are likely to be part of a scam which results in loss to you. Pi Network strongly recommends that you refrain from participating in any current DEX trading pairs. If you choose to proceed, despite this warning, you run the risk of being defrauded, receiving fake Pi and losing your money. Please refer to the KYB’d services page on the Pi official website for verified businesses that integrate with Pi. We recommend that you only engage with businesses listed on this page.
https://minepi.com/kyb-list/#VerifiedBusinesses