Alex Atallah
Investor2× unicorn founderCo-Founder at OpenSea · Founder at OpenRouter
New York, New York, United States
Writes $100K – $5M checks
About
Alex Atallah has founded two unicorns: OpenSea, the NFT marketplace he started with Devin Finzer in Y Combinator's W18 batch that reached a $13.3 billion valuation, and OpenRouter, the AI model-routing marketplace Stripe agreed to acquire in August 2026 for a reported $7.5 billion — Stripe's largest acquisition ever. Born in Colorado to a Colombian-immigrant father, he studied computer science at Stanford and worked at Palantir before Forbes named him one of the first NFT billionaires in January 2022. He founded OpenRouter in 2023 after his Window AI browser extension convinced him AI would stay multi-model; the company grew from 4 models at launch to 400+ models and 10 million developers in three years.
Invests in
Crypto & Web3Data & InfrastructureDeveloper ToolsGamingMarketplaces
Beyond investing
- Founded
- Built Window AI, a browser extension that connects LLMs to the web. Built Wificoin, a hackathon project for wifi sharing that eventually led to OpenSea. Cofounded the fintech startup Apollo.ai, which shut down after four months. Co-founded OpenRouter in early 2023 with Louis Vichy, after building the Window AI browser extension to test whether developers wanted model portability. Co-founded OpenSea with Devin Finzer in 2017; the pair entered Y Combinator's W18 batch with WifiCoin, a wifi-sharing project, before pivoting to an NFT marketplace inspired by CryptoKitties.
- Boards
- Remained on OpenSea's board after stepping back from day-to-day operations on July 30, 2022.
- Communities
- Participated in the Lightspeed Summer Program, advised by Jeremy Liew. Started programming young: webmaster for the WOW! Children's Museum in Boulder County at 14, and a data-visualization engineer whose Google Maps trade tool was used by House and Senate committees at 17.
- Awards
- Won the 'best API integration' award at the 2014 Meteor Hackathon for building Saurus, a word processor with real-time NLP. Named one of the first NFT billionaires by Forbes in January 2022 alongside co-founder Devin Finzer, after OpenSea's $300M Series C at a $13.3B valuation.
- Hobbies
- Participates in hackathons, building projects like Saurus and Wificoin.
- Family
- Born in Colorado to a Colombian-immigrant father and an American mother.
- More
- Led OpenSea Ventures, OpenSea's corporate venture arm, from its launch in February 2022, and handed the CTO role to Nadav Hollander when OpenSea acquired Dharma Labs in January 2022. Agreed to sell OpenRouter to Stripe in August 2026 for a reported $7.5 billion — Stripe's largest acquisition and one of the largest in AI — about three months after a $113M Series B valued the company at $1.3B. Angel investor in roughly a dozen startups, including Lens and W4 Games.
Mentioned above: the Y Combinator mafia → · the Y Combinator mafia → · the OpenSea mafia →
From Alex's own website — common ground for a warm intro.
Founder at OpenRouter
Intro paths
In turn, Alex can intro founders to OpenRouter's investors below.
OpenRouter's investors · 7
Co-founders at OpenRouter
Co-Founder & CTO at OpenSeaYC W18
Intro paths
Alex went through Y Combinator (Winter 2018) — any YC alum in your network can reach them through the YC community.
In turn, Alex can intro founders to OpenSea's investors below.
OpenSea's investors · 27
Co-founders at OpenSea
Experience
- OpenRouterCEO, Co-Foundercurrent2023 — presentNew York, New York, United States
- OpenSeaCo-Founder2018 — 2022New York, New York, United States
- Whatsgoodly Inc.Chief Technology Officer2016 — 2017Menlo Park, California
- ZugataLead Frontend Engineer2015 — 2016Palo Alto, California
- Palantir TechnologiesForward Deployed Engineer2012 — 2014Palo Alto, CA
- hostess.fm, Inc.Chief Technology Officer2013New York City, NY
- Apple Inc.Software Engineer20111 Infinite Loop, Cupertino, CA
- DormlinkCo-Founder2010 — 2011
- The Trade PartnershipData Visualization Engineer2010 — 2011
- WOW! Children's MuseumWebmaster2007
Education
- Stanford UniversityBachelor of Science (B.S.), Computer Science2010 — 2014
- Y Combinator2018
- University of OxfordBing Overseas Study Program, Cyber/Computer Forensics and Counterterrorism2013
- Fairview High SchoolHigh School2006 — 2010
Skills & more
+12 more
CryptographyMobile ApplicationsMachine LearningFunctional ProgrammingCoffeeScriptWebSocketsCloud ComputingUser InterfaceJavaScriptJavaCustomerCentric SellingPythonLanguages English · French · Spanish
From Alex's professional profile.
Investments
Board seats
OpenSea
Per curated public sources.
Podcasts & interviews
featuring Alex AtallahOpenRouter CEO: Why Chinese Open Models Are Beating the US | Why Enterprises Fear OpenAI & Anthropic
20VC with Harry Stebbings
OpenRouter: The Only AI Tool You'll Ever Need | Founder Alex Atallah
Limitless with Josh Kale
Fun stories from building OpenRouter and where all this is going
AI Engineer
From OpenSea to OpenRouter: Alex Atallah’s Masterplan for LLMs | Data Driven NYC
The MAD Podcast with Matt Turck
Writing
All posts ↗Alex Atallah writes about technology and crypto, covering how AI will push software engineers toward scientific thinking, publish/subscribe as a product principle across consumer tech, and the problems with enforcing NFT creator royalties.
Argues software engineers must adopt scientific and management skills to stay valuable amid AI, gaining advantage by acquiring non-digital context that AI agents lack.
Reframes the publish/subscribe pattern as a consumer-tech innovation principle, illustrated across marketplaces, social media, search engines, Web3, and generative AI.
Explains why NFT creator royalties are broken and unenforceable on-chain, discussing OpenSea's filter registry and possible alternative creator business models.
Frequently asked questions
- Where does Alex Atallah work?
- Alex Atallah is Co-Founder at OpenSea and Founder at OpenRouter.
- What does Alex Atallah invest in?
- Alex Atallah invests in Crypto & Web3, Data & Infrastructure, Developer Tools, Gaming, Marketplaces.
- What check size does Alex Atallah write?
- Alex Atallah typically writes checks of $100K – $5M.
- What companies did Alex Atallah found?
- Alex Atallah founded OpenSea, OpenRouter.
Founder mafias
Y Combinator mafia8,732
Also came through, then founded or led a company.
+ 8,725 more
Y Combinator mafia4,701
Also came through, then founded or led a company.
+ 4,694 more
Stanford University mafia855
Also came through, then founded or led a company.
+ 848 more
University of Oxford mafia282
Also came through, then founded or led a company.
+ 275 more
OpenSea mafia7
Also came through, then founded or led a company.
Same school
Also attended Stanford University2,000
+ 1,994 more
Also attended Y Combinator2,000
+ 1,994 more
Also attended University of Oxford950
+ 944 more
Shared employers
Also worked at OpenRouter2
Also worked at OpenSea12
+ 6 more
Also worked at Palantir Technologies200
+ 194 more
Also worked at Apple Inc.457
+ 451 more