OpenSea

OpenSea is the top NFT marketplace by all-time trading volume, enabling minting, buying, and selling across Ethereum, Polygon, Arbitrum, Base, and more. Launched in 2017, it offers tools like OpenSea Pro and the Seaport protocol for advanced trading.

The company raised over from investors like a16z, Paradigm, and Coatue. Its latest Series C round in January 2022 valued OpenSea at , marking it as one of the most valuable companies in the NFT and crypto industries.