OpenSea, the largest NFT marketplace, is looking for a $13 billion valuation. Coatue Management, a New York-based tech-focused investment manager, is leading a funding round for the "eBay of NFTs." Katie Haun, a venture capitalist who departed Andreessen Horowitz in mid-December, is also among the participants. Haun serves on the board of directors alongside the company's co-founders, Alex Atallah and Devin Finzer.