OpenSea

software wallet

Operational

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Largest non-custodial NFT marketplace; founded 2017; notable phishing and email breach incidents.

Platform Information

Founded

2017

Headquarters

New York, United States

Open Source

Two-Factor Authentication

Custodial

Platforms Supported

Web

Supported Chains

ethereumpolygonsolana

nft-marketplacenon-custodialdefiethereumpolygonsolanaweb3

About OpenSea

OpenSea is the largest NFT marketplace, founded in 2017 by Devin Finzer and Alex Atallah. It operates as a non-custodial platform where users connect external wallets to buy, sell, and mint NFTs across Ethereum, Polygon, and Solana. In February 2022 a phishing attack resulted in approximately $1.7 million in NFTs stolen from 32 users, and in June 2022 a third-party email vendor breach exposed 1.8 million user email addresses. OpenSea relaunched as OS2 in 2024 with a fee structure and SEA token.

Security & Score

Platform Safety Score

55/100— Fair

Based on incident history, security features, and track record

Security Features

non-custodialaudited smart contracts (Seaport)verified collectionsfraud detectionbug bountyhardware wallet support

Incident History

No incidents recorded for this platform.

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