NFT marketplaces allow digital creators to sell their work as NFTs and earn ownership and cryptocurrencies in return. The top NFT marketplaces include OpenSea, Raible, Foundation, and Super Farm. NFT marketplaces provide high liquidity through instant trading of NFTs, which are often kept as collateral or exchanged for other cryptocurrencies. They also allow developers to limit scarcity by restricting the number of specific rare items created.