OpenSea (SEA)

OpenSea is a decentralized peer-to-peer marketplace for buying, selling and trading rare digital goods, from gaming items to collectibles to art, which are built on non-fungible token (NFT) technology and run on the Ethereum blockchain.

Series C Round: $300M

Series B Round: $100M

Series A: $23M

Seed Round: $2M

Pre-Seed Round: $150K

Whitepaper

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Interest lvl

Highest

Updated: Jul 17, 2025

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User Rating

Medium

3/5 • 1 votes

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Ticker

SEA

FoundedUnited States

Registration countryUnited States

Registration year2017

Office address548 Market St PMP 397006 San Francisco, CA 94104-5401

Ecosystems

Ethereum

What is OpenSea

OpenSea is an NFT marketplace that enables users to discover, collect, and sell blockchain-based digital assets.

OpenSea are excited about a brand new type of digital good called a non-fungible token, or NFT. NFTs have exciting new properties: they’re unique, provably scarce, tradeable, and usable across multiple applications. Just like physical goods, you can do whatever you want with them! You could throw them in the trash, gift them to a friend across the world, or go sell them on an open marketplace. But unlike physical goods, they're armed with all the programmability of digital goods.

A core part of OpenSea vision is that open protocols like Ethereum and interoperable standards like ERC-721 and ERC-1155 will enable vibrant new economies. OpenSea are building tools that allow consumers to trade their items freely, creators to launch new digital works, and developers to build rich, integrated marketplaces for their digital items.