seyong

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seyong
Image: X profile avatar of @seyong
known as	seyong, se
real name	Se Yong Park
handle	@seyong
role	Cofounder of fomo
previously	dYdX, Deutsche Bank
education	Yale University (Economics), London School of Economics
active since	2025 (as fomo cofounder)

Se Yong Park, known on X as seyong (@seyong), is a cofounder of the social trading app fomo and a former dYdX business development hire and product manager.

Contents

1 Background
2 fomo
3 Community relations
4 Public persona
5 References

Se Yong Park, known on X simply as se under the handle @seyong, is a cofounder of fomo, the social crypto trading app that became one of the highest revenue trading products in the trenches during 2026. Alongside CEO Paul Erlanger he is one of the two publicly named founders, and he serves as the product's most visible voice on crypto Twitter, where his account had roughly 42,000 followers by mid 2026.

Background

According to interviews and profiles, Park was born in South Korea and moved to New Jersey at age four, growing up in a family of modest means. He was accepted early to Yale University, where he studied economics, and also attended the London School of Economics. He met his future cofounder Paul Erlanger during an internship at Deutsche Bank, then joined the bank's investment banking division after graduation, working on complex asset backed securities.

In 2022 Park left banking for the crypto derivatives exchange dYdX as its second business development hire, where he has said he helped grow the exchange's market maker roster from a handful of firms to roughly 150. He later moved into product and became a core product manager for trading, experience he has credited with shaping fomo's design.

fomo

Park cofounded fomo in 2025 with Erlanger; the app launched in public beta in May 2025 and raised a Benchmark led Series A that November followed by a 75 million dollar Series B led by Index Ventures in June 2026 at a 550 million dollar valuation. Park's stated thesis, laid out in his X article "Never miss out again, fomo," is that trading should feel as simple and social as a consumer app, without gas, bridges or seed phrases (see fomo).

To demonstrate the product, Park has said he traded on the app for hours every day and ran a public challenge turning 5,000 dollars into 250,000 dollars during fomo's first month, "just to show, okay, you can do it." He is a frequent podcast guest, appearing on Solana's Billions with Pedro Miranda in March 2026, The Rollup and The Archive, where he discusses social trading, onboarding normal users into meme coins, and fomo's fee based, no token model.

fomo's revenue accelerated sharply in mid 2026. Per DeFiLlama, weekly protocol revenue hit successive all time highs: 1.39 million dollars for the week ending July 16, 1.57 million for the week ending around July 27, and 2.64 million for the week ending August 8, 2026, three records in about three weeks. The August figure ran 86 percent above Phantom's 1.42 million and nearly triple Jupiter's 912 thousand, and fomo's Q3 revenue through August 8 (9.66 million) had already passed the whole of Q2 (7.06 million). Crypto Briefing reported that in that same week fomo briefly overtook Hyperliquid in 24 hour revenue, with daily revenue peaking near 399 thousand dollars, while cautioning that Hyperliquid normally posts daily figures in the millions and framing the flip as a shift in attention rather than parity; the same report put fomo past 625,000 users by June 2026 with over 4 billion dollars in cumulative volume, and noted the app had launched perpetual futures that same month through partnerships with Hyperliquid and Trade.xyz. On August 18, 2026 Park announced a single day usage milestone, "1,000,000 swaps done on fomo today!", and the same day the app shipped Chinese language support on its web client, with Park polling followers on which language fomo should support next.

Community relations

On July 25, 2026, trader SolanaDali publicly flagged a leaderboard PNL calculation bug on fomo, writing it was a "shitshow with all these Fake PNLs." Park reached out to the trader directly, which SolanaDali later publicly credited as "what real founders do and take accountability."

On July 28, 2026, Park publicly denied that fomo pays traders to use the app, after reports surfaced of unnamed competitors offering "large piles of cash" to leave. He said fomo's network "has been built organically" and that the company would "never pay anyone to trade on our app."

Public persona

On X, seyong posts product announcements, growth milestones and trading culture commentary in the informal register of crypto twitter, and community threads retelling his Korea to Yale to dYdX story circulate as founder lore. Unlike many trench figures he operates under his widely published real name, which appears in TechCrunch, The Block and fomo's own materials.

TwitterScore data shows the @seyong handle itself predates his crypto career, registered in February 2011; the account ranks 806th of 483,288 tracked crypto accounts and counts ZachXBT, Solana's official X account, toly, Ansem and Mike Dudas among its followers.

His persona centers on the word "normies," the mainstream users fomo is built to onboard: "Steady lads. The normies are coming," he posted in July 2025, and in November 2025 he announced in app $MON token gifting to more than 10,000 users, saying that for the first time normies could access the same rewards as crypto native users. The account has earned a parody in return, @blackseyong, which posts fomo memes in his voice ("bro loves normies"); seyong banters with it directly, replying "just press enter and it copies" to one of its posts on August 18, 2026. The same day he joked about fomo's new social "clans" feature, "i cant believe no one has invited me to a clan. am i washed".

References

techcrunch.com: https://techcrunch.com/2025/11/06/why-benchmark-made-a-rare-crypto-bet-on-trading-app-fomo-with-17m-series-a
The Block: https://www.theblock.co/post/405563/crypto-trading-app-fomo-raises-75-million-at-550-million-valuation-in-index-ventures-led-series-b-report
X profile of @seyong: https://x.com/seyong
X profile of @seyong: https://x.com/seyong/article/2071277475720770022
X post by @Param_eth: https://x.com/Param_eth/status/2087819367207874915
X post by @EtanBoss: https://x.com/EtanBoss/status/2069883655091269665
solana.com: https://solana.com/podcasts/billions-with-pedro-miranda/episodes/79c3be30-ca81-40ec-bb32-093f92039c5c
open.spotify.com: https://open.spotify.com/episode/0vUaWpJfseVt0sSV69AdiU
therollup.co: https://therollup.co/podcast/fomo-co-founder-the-fomo-bull-thesis-for-trading-crypto-be-early
cypherhunter.com: https://www.cypherhunter.com/en/p/se-yong-park/
SolanaCompass: https://solanacompass.com/news/fomo-posts-264m-weekly-revenue-all-time-high-on-solana-outpacing-phantom-and-jupiter
Crypto Briefing: https://cryptobriefing.com/fomo-weekly-revenue-all-time-high-solana/
KuCoin: https://www.kucoin.com/news/flash/fomo-weekly-revenue-hits-1-39m-on-solana-third-highest-among-protocols
Crypto Briefing: https://cryptobriefing.com/fomo-overtakes-hyperliquid-24-hour-revenue/
X post by @seyong: https://x.com/seyong/status/2089531068525273371
X post by @seyong: https://x.com/seyong/status/2089806092209434814
X post by @seyong: https://x.com/seyong/status/2089775047707631814
X post by @seyong: https://x.com/seyong/status/2089755225905066275
TwitterScore: https://twitterscore.io/twitter/seyong/
X post by @seyong: https://x.com/seyong/status/1942621714417926625
X post by @seyong: https://x.com/seyong/status/1993035246737277278
X post by @blackseyong: https://x.com/blackseyong/status/2089455315792335301
X post by @seyong: https://x.com/seyong/status/2089796178862887278
X post by @SolanaDali: https://x.com/SolanaDali/status/2081032847368794155
X post by @SolanaDali: https://x.com/SolanaDali/status/2081063568414224744
X post by @seyong: https://x.com/seyong/status/2083972345769705562