The year 2021 witnessed the explosive rise of NFTs, captivating not only tech enthusiasts but also high-profile figures and major corporations. From NBA star Stephen Curry to global brands like Budweiser and Visa, numerous entities joined the frenzy of purchasing non-fungible tokens. Even a local Taiwanese fried chicken stall, "Shi Yuan," launched its own NFT collection. The total trading volume of NFTs is estimated to reach $25 billion by the end of the year. But did you know that a single platform dominates 90% of this massive market?
What Is OpenSea?
Founded in 2017, OpenSea is the world’s largest NFT marketplace. It allows users to buy, sell, and mint various types of NFTs. For developers, OpenSea provides APIs to build personalized trading platforms. For creators, it introduced a royalty model, enabling them to earn a percentage from every subsequent sale of their NFT after the initial transaction. OpenSea generates revenue by charging a 2.5% fee on each trade.
According to Dune Analytics, OpenSea currently holds a 97% market share in NFT trading. Contrary to the typical perception of the crypto space as highly speculative, OpenSea’s founders have adopted a patient and conservative approach, standing out in a market often driven by hype and gambling mentalities.
The Origins: From CourseKick to Wificoin
OpenSea’s co-founder, Devin Finzer, began his entrepreneurial journey in 2011 while studying computer science at Brown University. He and a classmate launched CourseKick, a social course selection system. Unlike the university’s outdated platform, CourseKick allowed users to easily choose classes and view their friends’ schedules, attracting 20% of the student body within a month.
Although CourseKick’s social vision didn’t fully materialize, the project nurtured two highly successful entrepreneurs. The other co-founder, Dylan Field, went on to create Figma, a design collaboration platform now valued at $10 billion.
After graduating, Devin worked as an engineer at Pinterest but left within two years to pursue his passion for entrepreneurship. He developed several projects, including a vision-testing app and a service that helped users find unclaimed property by aggregating state databases.
In 2017, Devin dived into the blockchain and cryptocurrency space, collaborating with software developer Alex Atallah. They created Wificoin, a project that rewarded users with tokens for sharing WiFi router access. The idea was that cryptocurrency transaction fees were lower than traditional credit card payments, making micro-purchases of WiFi data feasible. This innovation earned them a spot in the prestigious Y Combinator startup accelerator.
The CryptoKitties Craze and a New Vision
In November 2017, CryptoKitties, a virtual cat-breeding game built on Ethereum, took the crypto world by storm. Its popularity stemmed from using the ERC-721 standard, which assigned a unique ID to each token, creating non-fungible tokens (NFTs). Players could trade cats and breed them to produce new traits, with rarer features commanding higher prices.
CryptoKitties demonstrated the potential of NFTs beyond finance, inspiring Devin to explore new technological and cultural applications. He and Alex decided to pivot, creating a marketplace for NFTs. Devin believed that ERC-721 established a unified standard for digital goods, making it possible to build a marketplace that could support diverse NFT projects.
Staying Focused on the Vision
In February 2018, OpenSea launched on Product Hunt, introducing itself as "the eBay for crypto goods." With the backing of Y Combinator, OpenSea raised $2 million in angel funding from investors like Founders Fund and Coinbase Ventures.
At the time, OpenSea faced stiff competition from Rare Bits, a startup founded by former Zynga employees and backed by top venture firms like Spark and First Round. Rare Bits adopted a different business model, charging no commission on initial sales (OpenSea charged 1% initially, later raising it to 2.5%) and covering transaction gas fees.
However, these differences led the companies down divergent paths. When the crypto market entered a downturn in 2018, Rare Bits’ burn-rate-intensive model forced it to explore various avenues, such as partnering with anime streaming platform Crunchyroll to launch collectible "digital stickers."
Meanwhile, OpenSea maintained a lean team of seven and focused on building its marketplace. Despite advice to specialize in niches like art, gaming, or music, Devin and Alex chose to create a universal platform for all NFT types. This decision maximized liquidity and allowed any project to be listed and traded.
When asked about the key to their success, Devin emphasized the team’s long-term commitment to the NFT space. Even in March 2020, after 26 months of operation, OpenSea had only 4,000 monthly active users and a monthly trading volume of $1.1 million. Yet, Devin and Alex remained optimistic about NFTs’ future. Their prudent financial management and company culture helped them weather the crypto winter and prepare for the 2021 NFT boom.
The Rise of Profile Picture Projects
In late 2020, digital artist Beeple sold a series of works for $3.5 million on the premium NFT auction platform Nifty Gateway, drawing mainstream attention to NFT trading. As prices soared, more speculators and creators entered the space, fueling the rise of profile picture (PFP) NFT projects. Influencers swapped their Twitter avatars for limited-edition NFT portraits to show support and belonging. Projects like CryptoPunks, Bored Apes, and Meebits became cultural phenomena, driven by FOMO (fear of missing out), social status, and speculative opportunities. This surge propelled NFT market sales from $94.8 million in 2020 to an estimated $25 billion in 2021.
Superior Product Design
OpenSea’s product strengths lie in its ease of use, extensive asset library, and powerful search and filtering system.
Creators can list music or image NFTs with just a few clicks, uploading data and filling in details. The platform is inclusive, allowing long-tail creators to mint and trade NFTs effortlessly. OpenSea also boasts a diverse range of NFT assets, thanks to Devin’s early efforts to scout new projects on Discord, making it the go-to platform for creators.
Moreover, OpenSea excels in NFT discovery and filtering. Users can apply detailed search parameters to find specific traits. For example, in the Bored Ape Yacht Club collection, buyers can filter by fur color or glowing eyes to identify the rarest apes. Each listing page displays transaction history and provenance, enhancing the browsing and purchasing experience.
Future Challenges and Evolution
Today, OpenSea is a behemoth with a monthly trading volume of $2 billion, but it faces several challenges. Critics in the crypto community argue it isn’t decentralized enough, as it lacks a native token and retains full control over governance and fee structures. Competition is also intensifying. Coinbase, a publicly traded crypto exchange with over 8.8 million monthly active users, plans to launch its NFT marketplace by year-end, following similar moves by FTX and Binance. Niche platforms like Axie Infinity’s native marketplace pose additional threats by offering tailored experiences.
OpenSea’s open model also increases fraud risks, as bad actors can easily mint and sell stolen artwork.
To address these challenges, OpenSea raised $100 million in a Series B round led by Andreessen Horowitz (a16z) in July. Reports indicate it is seeking further funding at a valuation of up to $10 billion. The platform is also rolling out improvements, including a mobile app, stolen content detection, and support for blockchains beyond Ethereum, to lower barriers to entry. Devin Finzer has stated that purely collectible NFTs may fade, giving way to multi-layered utility—such as NFTs conferring concert access or exclusive forum membership. OpenSea is actively partnering with companies to enable these innovations.
👉 Explore advanced NFT trading strategies
Frequently Asked Questions
What is an NFT?
An NFT, or non-fungible token, is a unique digital asset stored on a blockchain. Unlike cryptocurrencies such as Bitcoin, which are interchangeable, each NFT has distinct properties and cannot be replicated, making it ideal for representing ownership of digital art, collectibles, and other one-of-a-kind items.
How does OpenSea make money?
OpenSea charges a 2.5% fee on every transaction conducted through its platform. This fee is applied to both primary sales and secondary market trades, providing the company with a steady revenue stream while supporting marketplace operations and development.
Why is OpenSea so popular?
OpenSea’s dominance stems from its early mover advantage, user-friendly interface, and extensive asset variety. Its support for diverse NFT categories and powerful search tools make it the preferred choice for both creators and collectors, fostering a highly liquid and active marketplace.
Can anyone create an NFT on OpenSea?
Yes, OpenSea allows anyone to mint and list NFTs without upfront costs. Creators only pay gas fees when completing the first sale or transferring ownership, making it accessible to artists, musicians, and other digital creators.
What are the risks of buying NFTs?
Common risks include purchasing counterfeit or stolen artwork, market volatility, and potential smart contract vulnerabilities. Buyers should verify the authenticity of NFTs, research project backgrounds, and use secure wallets to mitigate these risks.
How is OpenSea addressing fraud?
OpenSea has implemented measures like automated content verification, user reporting tools, and support for multiple blockchains to reduce fraud. The platform continuously updates its policies and technology to protect users and maintain trust.