OpenSea is an American online non-fungible token marketplace headquartered in New York City. 


OpenSea was founded by Devin Finzer and Alex Atallah in  2017 

Company later received pre-seed funding from Y Combinator in 2018, followed by a $2.1 million seed round in 2019. 

OpenSea offers a marketplace allowing for nft to be sold directly at a fixed price, or through an auction, based on the Ethereum ERC-721 standard 

In 2021, following a heightened interest in non-fungible tokens, the company's revenue reached $95 million in February 2021 and $2.75 billion in September of that year. 

In January 2022 OpenSea reimbursed users about $1.8 million after a user interface bug allowed users to buy more than $1 million worth of NFTs at a discount. 

OpenSea raised $300 million in new venture capital (Paradigm and Coatue Management), valuing it at $13.3 billion. 

OpenSea admitted that 80% of NFTs created with the tool where plagiarism or spam.