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Search for your favourite NFT under the Explore section Select Buy to kickstart the NFT purchasing process Pop up box with the purchasing details of an NFT Add the NFTs to the shopping cart and purchase all of it in one go OKX has an exclusive feature: on networks such as Ethereum, BSC, you can add several NFTs to the shopping cart, and buy them in one go to save network fees. Step 2: Sell the NFT when its value goes up To sell an NFT, visit Portfolio>Portfolio>NFT>Collected.