jiyoung kim's profile on Product Hunt

About

I build market-data apps at SIGNUM HQ, a one-person studio. The thing I keep coming back to: the numbers that actually explain why a US stock moved — how much volume printed off-exchange, where options open interest is stacked, where dealers flip from long to short gamma — are priced for institutions, not for the person reading the headline. So I ship them free, with no account, in English, Korean and Japanese. Three apps so far: SIGNUM HQ (the full picture), Undercurrent (the money behind each headline), and Why'd It Move? (one stock, one question, every night). Information and education only — not investment advice.

Badges

Tastemaker

Gone streaking

Maker History

SIGNUM HQDark pool, max pain and dealer gamma for US stocks
Aug 2026
Why'd It Move?Tonight's biggest US stock move, as a 30-second quiz
Aug 2026
UndercurrentSee the institutional money behind every headline
Aug 2026

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Joined Product HuntAugust 22nd, 2026

Forums

p/signum-hq

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2mo ago

I shipped institutional-grade data for free and the hardest part was not the data

SIGNUM HQ shows dark pool share, max pain, gamma exposure, the dealer gamma flip and unusual sweeps per US ticker, free, no account. Most of that lives behind terminals that cost more per month than rent.

Getting the data was the part I expected to be hard. It was not. Here is what actually was:

p/undercurrent

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2mo ago

We tracked every time the news and the money disagreed. The money is losing.

I build a free app that puts each market headline next to what institutional money actually did on that ticker dark pool share, options positioning, flow. When the story and the money point opposite ways, we mark it a divergence.

The uncomfortable part: we score them. Three days after every divergence, we check who was right and the running tally stays on screen where anyone can see it. As of this morning it reads: money 36, news 42, draw 62.

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1mo ago

Why'd It Move? - Tonight's biggest US stock move, as a 30-second quiz

Every night, the US stock that actually moved most becomes one question. You see the day's real 5-minute bars and pick why it moved — analyst action, sector rotation, earnings, macro. Then you find out, with the real reason and the numbers. Concepts you meet get filed into a library showing live values for that stock: RSI, VWAP, trend phase, short interest. Three minutes a night. English, Korean, Japanese. iOS and Android. Free, no account. Education only — not investment advice.