Here's what you need to know about where to buy and sell NFTs. Digital art has brought in millions for creators and sellers Mike Winkelmann's "Crossroads" was resold for $6.6 million off Nifty Gateway Nifty Gateway Most digital-art trading platforms allow creators to gather a royalty. Some art platforms are more exclusive, while others focus on letting anyone create and sell their art. Some traditional auction houses have already started to get in on NFTs. In February, Christie's — an auction house that was founded in 1766 — made its first foray into digital tokens when it auctioned a Beeple piece. The piece is currently listed at $9.75 million, with two days left in the auction.