Docs Guides
Trade a Seoul stock while Seoul sleeps
SK hynix on a New York afternoon: reading the night, sizing for the open, and leaving an exit behind.
It is 14:00 in New York, 04:00 in Seoul. The Korean exchange closed at 15:30 and opens at 09:00, five hours from now, and SK hynix’s perp has been trading all night. Here is how to read it, take a position for the open, and leave an exit behind.
1. Read the night
- Open the Seoul desk: the clock says how long until the open, and the table how each Korean name has moved since the close.
- Compare SK hynix’s move with its usual move while shut (the ± figure on the markets board). Down 2.3% against a usual ±2.4% is an ordinary night; down 6% would not be.
- Check funding. Deeply negative means shorts pay longs to stay short: the crowd is short, and longs are being paid to wait.
- In the terminal, the After hours tab shows how the last nights ended at the open and how far the first 30 minutes moved.
2. Size for the open
The open is where these perps reprice in seconds. From 08:30 to 09:15 Seoul time the guard caps leverage at 3x, and a gap of twice the usual move happens. Choose leverage so the liquidation price sits far beyond that: at 3x it is about a third away; at 10x under a tenth, inside a bad open.
3. Place it
- Long, Limit at 1,010, a little under the price; or Market now; or Market with When set to At the open, so it waits for Seoul’s first print.
- Size $600 at 3x: $200 of margin.
- TP/SL on: a stop at 990, under the night’s range, and a take-profit at 1,070.
4. Leave it, safely
The take-profit and the stop live on Hyperliquid and hold with the tab closed. Turn on a push for fills, or /watch SKHX on Telegram, and the open will tell you what happened. If the order is a timed one, turn on running while away so it goes out without the tab.