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3.7/ 5
Our score
Good
Chains
EthereumSolanaBasePolygon+3
Launchpad
Yes
Token
SEA
What is OpenSea?
OpenSea is a peer-to-peer, self-custodial platform for discovering, buying, selling and minting NFTs, with token swaps across multiple blockchains. Founded in 2017, it has expanded from an NFT marketplace into a multi-chain trading platform supporting 25+ networks.
Company and funding
OpenSea was founded by Devin Finzer, its co-founder and CEO, and Alex Atallah, co-founder. The company entered Y Combinator in 2018. Its disclosed funding includes a $23 million Series A with participation from Andreessen Horowitz in March 2021, a $100 million Series B led by Andreessen Horowitz in July 2021, and a $300 million Series C led by Paradigm in January 2022. Total reported funding is $425.1 million. The company is headquartered in Miami, United States.
How the platform works
Users connect a self-custodial wallet to browse collection pages, make purchases, create listings and place offers. OpenSea does not hold user funds or take custody of tokens. Its supported chains include Ethereum, Solana, Base, Arbitrum, HyperEVM, Optimism, Abstract, Monad, Ink, Polygon, Avalanche and Zora, alongside other networks. Solana supports token swapping on the main platform, while Solana NFTs are available in OpenSea Mobile. OpenSea Studio lets creators deploy NFT contracts and mint items. It also supports NFT drops. Its developer API and Model Context Protocol server provide access to NFT and marketplace data.
Fees and availability
Blockchain gas fees apply to transactions and attempted transactions, including unsuccessful mints. OpenSea does not control those network charges. OpenSea announced a 0% token-trading-fee period for 60 days from March 31, 2026. In September 2026, its mobile announcements described 0% platform trading fees and improved swap execution. The platform uses connected wallets rather than custodial accounts.
Track record and risks
OpenSea launched in 2017 and introduced OS2 in 2025 as a rebuilt multi-chain trading platform. In October 2025, reported monthly activity reached $1.6 billion in cryptocurrency trading volume and $230 million in NFT trading volume. Trail of Bits reviewed the Seaport protocol. A 2022 phishing attack linked to an exploit in the Wyvern platform led to NFT theft from some users. In June 2022, an email vendor improperly shared about 1.8 million addresses. The SEC closed its investigation into OpenSea in February 2025 after issuing a Wells notice in August 2024. Creator-fee enforcement is documented, while the planned SEA token launch was delayed in March 2026.
Founders
Devin FinzerCo-founder and CEO
Alex AtallahCo-founder
Best for:Multi-chain NFT collectorsCreators launching NFT dropsSelf-custodial wallet usersDevelopers building NFT tools
Pros and cons
Pros
- Self-custodial wallet model avoids OpenSea holding user funds
- Supports 25+ chains through one marketplace interface
- NFT minting and primary drops are available through OpenSea Studio
- Developer API covers NFTs, tokens, swaps and marketplace events
- Seaport protocol received a Trail of Bits review
Cons
- Gas fees apply to transactions and failed mint attempts
- Solana NFT support is currently limited to the mobile experience
- NFT markets remain exposed to phishing, fake collections and wash trading
- A 2022 Wyvern-linked phishing attack caused NFT theft for some users
- The planned SEA token launch was delayed in March 2026
Our review
3.7/5
Good
OpenSea combines broad multi-chain access with self-custody, but buyers face gas costs, phishing and fake-collection risks, past security incidents and a delayed SEA token.
OpenSea is a self-custodial NFT marketplace that has expanded into token swaps across multiple supported networks, including Ethereum, Base, Arbitrum and Polygon. Solana currently supports token swapping on the main site, while Solana NFTs are available in OpenSea Mobile. The platform reported $230 million in NFT trading volume in October 2025, alongside $1.6 billion in cryptocurrency trading volume.
Its main strengths are breadth, creator tooling and wallet control. OpenSea Studio supports NFT mints and drops, while the developer API covers tokens, NFTs, swaps and marketplace events across supported chains. The marketplace does not hold user funds, so a connected self-custodial wallet remains responsible for assets and transaction approval. Gas applies to transactions and attempted transactions, including failed mints. The documented 0% token-trading period began on March 31, 2026 for 60 days.
OpenSea Studio includes drop configuration and presale stages. Creator-fee enforcement is documented. The SEA token was announced with community allocation and planned staking utility, then delayed in March 2026 from its planned launch.
The company has operated since 2017, was founded by Devin Finzer and Alex Atallah, entered Y Combinator, and raised $425.1 million across reported rounds including a $300 million Series C led by Paradigm. Its record includes a February 2022 phishing-related NFT theft, a June 2022 email-address disclosure affecting about 1.8 million addresses, and a Wells notice from the SEC in August 2024; the SEC closed that investigation in February 2025.
Specs
| Chains | Ethereum, Solana, Base, Polygon, Arbitrum, Avalanche, Other |
|---|---|
| Focus | Art, Collectibles, Gaming |
| Launchpad | Yes · unverified |
| Mobile app | Yes · unverified |
| Token | SEA · unverified |
| Points or rewards program | Yes · unverified |
Not disclosed by the provider: KYC required, Marketplace fee, Creator royalties, Aggregates other markets, Zero marketplace fee.
Data from the provider's website and public sources. Fees and availability change; confirm on the official site before you sign up.
Key features
Multi-chain NFT trading
Buy, sell and make offers on NFTs across Ethereum, Base and Arbitrum.
Token swapping
Swap tokens across supported chains through a connected self-custodial wallet. Solana currently supports token swaps.
NFT minting tools
OpenSea Studio supports NFT contract deployment, minting and primary drops, with gas fees charged by the underlying blockchain.
Collection discovery
Collection and token pages provide real-time onchain data.
Creator drops
Creators can configure primary drops with presale stages, wallet limits, reveal settings and collection metadata.
Developer API
The API covers tokens, NFTs, swaps, listings, offers, analytics and marketplace events across supported chains.
AI data access
The Model Context Protocol server provides NFT, wallet and marketplace data, including collection verification and live offers.
Mobile trading
OpenSea Mobile supports onchain trading and includes Solana NFTs, which went live on the app in September 2026.
Inside OpenSea
NFT marketplace
The peer-to-peer marketplace lets users discover, buy, sell and mint NFTs and digital collectibles through connected self-custodial wallets. Collection pages include onchain listings and offers.
Token trading
OpenSea supports token swaps across its listed networks through a connected wallet. Solana is supported for token swapping on the main platform, while Solana NFTs are available in OpenSea Mobile.
OpenSea Studio
OpenSea Studio provides NFT minting and drop creation tools. Creators can configure presale stages, upload metadata and publish a drop page.
Developer API
The developer API provides access to token, NFT and swap data, plus marketplace analytics and events across supported chains. Documentation also covers listings and offers.
Model Context Protocol server
OpenSea's Model Context Protocol server provides real-time NFT, wallet and marketplace data for developers and AI applications across multiple chains. Its data includes collection verification and live listings and offers.
OpenSea screenshots
What users say about OpenSea
Most discussion around OpenSea is self-promotion, collection links and referral-code requests, with little substantive product feedback. The clearest praise is for app speed and fixes after updates, while the main complaint is the need for ETH to cover gas fees.
In their own words
“app used to take three coffees to load a collection. this is an improvement. speed does cut into the time i spend talking myself out of buying things, so mixed feelings.”
“Check the app update. I experienced the same thing, but after update the problem is gone”
“you have to send eth from another wallet to that wallet, so you can have eth to pay for network fees.”
“you need to put some eth in your wallet first, you cant pay gas fees with eurc so its stuck until you do”
Scam warning: Fake NFT airdrop emails and links ask users to connect wallets
Scam warning: Suspicious offers can request WETH spending approval
Based on 200 Reddit posts and comments from the last 12 months, checked Oct 17, 2026. These are posts by users on other sites, not reviews submitted on CryptoReview.
User reviews
No user reviews yet. Have you used OpenSea? Share your experience below.
Funding and investors
$425.1MTotal raised
6Rounds
13Investors
-
Series C Jan 2022 $300M
-
Series B Jul 2021 $100M
-
Series A Mar 2021 $23M
-
Seed Nov 2019 $2.1M
-
Pre-seed Jan 2018 Amount undisclosed
-
Funding round Amount undisclosed
FAQ
Who founded OpenSea?
OpenSea was founded in 2017 by Devin Finzer and Alex Atallah. Finzer is the company's co-founder and CEO.
What fees does OpenSea charge?
OpenSea's documented token-trading fee was 0% for 60 days starting March 31, 2026. Blockchain gas fees still apply to transactions and attempted transactions, including unsuccessful mints.
Which chains does OpenSea support?
OpenSea supports Ethereum, Solana, Base, Arbitrum, HyperEVM, Optimism, Abstract, Monad, Ink, Polygon, ApeChain, MegaETH, Soneium, Somnia, AnimeChain, Avalanche, B3, Berachain, Blast, Flow, GUNZ, Robinhood Chain, Ronin, Sei, Shape, Unichain and Zora. Solana token swaps are available on the main platform, while Solana NFTs are available in OpenSea Mobile.
Is OpenSea safe to use?
OpenSea is self-custodial and does not hold user funds. Its Seaport protocol has been reviewed by Trail of Bits. A phishing-related NFT theft affected some users in February 2022, and an email vendor incident exposed about 1.8 million addresses in June 2022.
Does OpenSea have a token?
OpenSea has a planned SEA token, but its launch was delayed in March 2026 from the planned March 30 kickoff. The announced plan included a community allocation and staking utility.
Can creators mint NFT drops on OpenSea?
Yes. OpenSea Studio lets creators mint NFTs and create drops. Its tools include presale stages, collection settings, metadata uploads and custom drop pages.
Latest from OpenSea on X
Spooky season is here!
Get your PFP ready for Halloween! Drop it in the comments and we’ll reply with a custom video and picture for you.
A little treat to kick off the weekend. 🎃 https://t.co/tRTa5wkRsg
Get your PFP ready for Halloween! Drop it in the comments and we’ll reply with a custom video and picture for you.
A little treat to kick off the weekend. 🎃 https://t.co/tRTa5wkRsg
Thank you to everyone who joined us in Marfa this year!
A weekend celebrating art and the people who bring it to life. Truly one for the books.
Until next time, Marfa https://t.co/6OVO6Xuem4
A weekend celebrating art and the people who bring it to life. Truly one for the books.
Until next time, Marfa https://t.co/6OVO6Xuem4
Joining OpenSea’s Flagship Collection…
Construction Token by @jeffgdavis, one of the three original, iconic projects that launched @artblocks_io.
More below 👇 https://t.co/nHhBW4d3x4
Construction Token by @jeffgdavis, one of the three original, iconic projects that launched @artblocks_io.
More below 👇 https://t.co/nHhBW4d3x4
Referred a friend to OpenSea Mobile?
The first batch of referral rewards is ready to claim. Check your referrals tab to claim yours.
Haven’t started referring yet? Share your referral link with friends and earn when they trade. https://t.co/FyFkf290s2
The first batch of referral rewards is ready to claim. Check your referrals tab to claim yours.
Haven’t started referring yet? Share your referral link with friends and earn when they trade. https://t.co/FyFkf290s2
Recent public posts from @opensea, shown as published. Not reviewed or endorsed by CryptoReview.
Latest from OpenSea on Telegram
OpenSea
Join
@officialopensea · 66.9K subscribers
OpenSea Mobile is now open to everyone.
Everything you own. Everything you trade. Everyone you trade with.
Memes, art, trading cards, perps. 25+ chains, all your wallets, one app.
Trade everything, together. ⛵️
Everything you own. Everything you trade. Everyone you trade with.
Memes, art, trading cards, perps. 25+ chains, all your wallets, one app.
Trade everything, together. ⛵️
3.1K View on Telegram
onchain trading should be this simple.
25+ chains. one interface.
no bridging. no moving funds around. it just works.
gud tek 😎
25+ chains. one interface.
no bridging. no moving funds around. it just works.
gud tek 😎
We just dropped a surprise to select traders on OpenSea Mobile.
Were you one of them? Open the app and find out📱
Were you one of them? Open the app and find out📱
7.5K View on Telegram
OpenSea Mobile just got faster ⚡️
Improved performance. Better swap execution. All at 0% platform trading fees.
Update OpenSea Mobile now
Improved performance. Better swap execution. All at 0% platform trading fees.
Update OpenSea Mobile now
7.6K View on Telegram
Recent posts from the official Telegram channel @officialopensea, shown as published. Not reviewed or endorsed by CryptoReview.
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