The first thing Devin Finzer and Alex Atallah tried to sell was not a picture of a cat. It was Wi-Fi. Their 2017 idea, WifiCoin, proposed paying people in tokens for sharing access to a wireless router. The concept was clever, which is not quite the same as useful. Then CryptoKitties arrived: cartoon cats whose ownership lived on Ethereum, traded by people who behaved less like software testers than collectors at a feverish new fair. Finzer saw the opening. The pair stopped building the token and started building the place where tokens like it could change hands.
OpenSea launched in December 2017, before the term NFT had escaped its technical enclosure. The founding insight was modest and durable: if blockchain networks kept producing unique digital things, someone would need to organize the stalls. OpenSea would not decide which category mattered. It would be the general market, closer to eBay than to a single gallery. In the strange commercial weather of crypto, that neutrality became an advantage.
Finzer arrived at the idea with an engineer's education and a marketplace maker's habit. At Brown University, where he studied computer science and mathematics, he moved through internships and fellowships at Wikimedia, Google and Flipboard. He later joined Pinterest, learning what happens when a product must serve millions without feeling as if it were designed by a committee of millions. He had already co-founded Claimdog, a search tool for unclaimed money. Credit Karma acquired it, and Finzer led an integration team there. Finding money people did not know they had is excellent preparation for selling assets people had only just learned could exist.
Brown graduate, then Pinterest software engineer.
Claimdog acquired by Credit Karma.
WifiCoin gives way to OpenSea after CryptoKitties.
NFT volume surges; OpenSea reaches a $13.3 billion private valuation.
OS2 opens token trading across 19 chains.
The market before the market
For years, OpenSea was a wager on patience. The team entered Y Combinator's Winter 2018 class and kept working while the audience for NFTs remained small. In March 2020, the marketplace had about 4,000 active users and $1.1 million in monthly transactions. Those are respectable figures for a niche bazaar and rounding errors beside what followed.
Finzer helped write a long guide called The Non-Fungible Token Bible in January 2020. The title sounds cheeky now, but the document did necessary missionary work: history, technical anatomy, market map, possible futures. The industry's vocabulary had not yet hardened into slogans. Explaining the thing was part of building the thing.
“We definitely envision a multi-blockchain future.”Devin Finzer, 2021
Then the waiting ended. Artists, profile-picture collections, gaming projects and speculators arrived together. OpenSea processed $350 million in transactions in July 2021. By August, weekly trading could cross $1 billion. The company that had been preparing tables for a village sale found itself operating the exchange floor of a cultural mania.
Money made the company legible to outsiders. A $100 million round in July 2021 valued OpenSea at $1.5 billion. Six months later, a $300 million round put the figure at $13.3 billion. Finzer and Atallah's stakes were estimated at $2.2 billion each on paper. The two became shorthand for the NFT boom, which is flattering until a person remembers what happens to shorthand when the story changes.
When the tide began arguing back
The boom delivered scale faster than institutions could absorb it. OpenSea suffered outages and trust problems. A former product manager was convicted in a federal case involving trades made with confidential information about which collections would be featured. Scams and phishing gnawed at users. Each controversy pressed the same uncomfortable truth: a marketplace may be built on decentralized assets, but the front door still has locks, rules and a proprietor.
Then prices fell. The broader crypto downturn crushed NFT trading, while Blur attacked OpenSea with a product tuned to professional traders, zero fees and a different position on creator royalties. OpenSea's responses shifted. Attempts to balance collectors, traders and creators pleased nobody for long. Finzer later described the episode as a leadership lesson: reactive consensus was not strategy.
“For some of these things, the only way you get better is by having the thing happen and failing your way through it.”Devin Finzer, reflecting on competition and leadership
In July 2022 he cut about 20 percent of the workforce and wrote that OpenSea had been built with crypto's cycles in mind. A larger reset came in 2023. At a meeting with roughly 175 employees, Finzer announced that more than half would go. He also offered severance to retained staff who did not want the leaner mission. More good people accepted than he expected. By late 2025, OpenSea had roughly 60 employees and 10 contractors, most working remotely. The sea metaphor had stopped being decorative.
A second front door
The rebuilding idea came, in important part, from Finzer's wife, Yu-Chi Lyra Kuo. Finzer credits her with the proposal that OpenSea should become a place to trade any crypto asset, not only NFTs. He has called her a silent cofounder of OpenSea 2.0 and said she spent hundreds of hours on strategy and the technical map for gathering trades from different chains. It is a notable admission in a culture fond of the solitary-founder fable. Reinvention, in this account, was a conversation at home before it was a roadmap at work.
OS2 was rebuilt from the ground up. It put fungible tokens beside NFTs, added marketplace aggregation, cross-chain purchasing, analytics and new discovery tools. The public release in May 2025 offered token trading across 19 chains, including Solana support, along with cross-chain swaps and a rewards system called Voyages. The product tried to hide the industry's plumbing: bridges, separate liquidity pools, incompatible networks. Once again, Finzer's preferred business was a doorway into a complicated room.
Four snapshots of a changing market
By the first two weeks of October 2025, the rebuilt platform had facilitated $1.6 billion in cryptocurrency trades and $230 million in NFT transactions. Tokens accounted for the larger business. To call this a pivot away from NFTs, however, irritated Finzer. His phrase was “trade everything.” The distinction matters to him. OpenSea's first thesis, that blockchain networks would fill with owned digital objects, survives. The definition of the object has widened.
The other pressure came from Washington. In August 2024, OpenSea received a Wells notice from the Securities and Exchange Commission, signaling a possible enforcement action tied to the view that NFTs on the platform could be securities. Finzer answered publicly and pledged $5 million toward legal fees for NFT creators and developers facing similar notices. In February 2025, the agency closed its OpenSea investigation without charges. The episode turned an old product question - what is this digital object? - into a legal one with expensive consequences.
The collector and the operator
Finzer's public persona is restrained. His X biography offers the small joke “Non-fungible human.” His personal site says he collects rare digital items and is interested in open protocols, blockchain adoption, and the intersection of crypto and AI. His disclosed angel investments include Figma, Cognition Labs and OpenRouter: design, autonomous software work and a gateway to language models. He supports CODAP, a classroom data-exploration project, and belongs to Founders Pledge. The collection is not random. It circles tools that make new technical capabilities available to more people.
That pattern began before OpenSea. Claimdog made obscure state databases searchable. Pinterest turned an ocean of images into personal order. OpenSea organized assets scattered across blockchains. Finzer's recurring subject is not the collectible itself but the interface around it. He builds shelves, search boxes and transaction paths for things that would otherwise remain inaccessible or bewildering.
Marketplaces complicate that tidy description because people do not merely use them; they fight through them. Creators want durable royalties. Traders want low friction. Collectors want safety. Protocol advocates want openness. Regulators want recognizable boundaries. A founder can write code for an exchange, but the exchange soon writes politics for the founder. OpenSea's fee reversals exposed this. So did Finzer's later conclusion that some decisions cannot be crowdsourced without dissolving the decision.
His second act is therefore less romantic and more revealing than the first. Spotting CryptoKitties required imagination. Rebuilding after the crash required subtraction: fewer people, a broader product, a willingness to let an identity loosen. The first OpenSea proved that a market for NFTs could become enormous. The second must prove that OpenSea is more durable than the acronym that made it famous.
“You can't fight the macro trend.”Devin Finzer, 2025
There is no clean ending because markets object to endings. They close for the day and resume in the morning, carrying yesterday's enthusiasms at newly negotiated prices. Finzer remains at his post, still collecting, still making the front door. The digital cats have not disappeared. They simply share the market now with everything else.