Under thin liquidity, actual transactions do not equal reliable prices.

On the morning of July 28, 2026, the pre-market in South Korea saw only one share of SK Hynix traded at 1,272,000 Korean Won, equivalent to approximately 868 dollars. This transaction of less than 900 dollars was subsequently entered into the TradeXYZ pricing system, causing the SKHX perpetual contract to drop from a low of 1,128.2 dollars to 927 dollars within a minute.

In under three minutes, hundreds of accounts were taken over by the system. In the subsequent four hours, the liquidation scale rose to about 80 million dollars.

868 dollars triggered a market of 500 million dollars in SK Hynix perpetual contracts on Hyperliquid.

Pre-Market Pricing of Korean Stocks

The event started at Nextrade, which is an alternative trading system called NXT that operates outside KRX in South Korea.

NXT uses continuous bidding in pre-market trading. If the bid price exceeds the ask price, the orders will execute immediately. It does not deviate from the daily price limits for Korean stocks; the upper and lower limits are still based on the previous trading day's closing price at KRX, with a range of about 30%.

The closing price of SK Hynix on the previous day was about 1,816,000 Korean Won. Calculating down 30%, and adjusting according to the minimum quotation unit for Korean stocks, 1,272,000 Korean Won falls right near the legal price lower limit.

This transaction did not breach market rules. The problem lay in the depth of the order book: the buy orders in NXT's pre-market were thin, and a sell order at a sufficiently low price that executed one share pushed the latest transaction price down to the lower limit.

Source: @yourquantguy

It remains unclear whether the seller made a mistake, deliberately lowered the price, or simply was willing to sell at that price. For subsequent liquidation, the subjective intent is not as important. It is a real transaction and within the permissible price range, providing external market systems with reason to accept it.

The danger starts here.

Conduit of Incorrect Pricing

According to official documentation from TradeXYZ, SKHX tracks the dollar value of one share of SK Hynix common stock. The calculation method is straightforward: the Korean Won price of 000660.KS divided by the USDKRW exchange rate gives the oracle price for SKHX.

TradeXYZ has divided Korean stocks into external oracle feeding and internal pricing periods. The pre-market external pricing period runs from 8:00 AM to 8:50 AM KST, corresponding to 7:00 AM to 7:50 AM Beijing time. Thus, as NXT began its pre-market trading, TradeXYZ would obtain executable quotes from institutional data providers and input it as an external price.

Before 7:00 AM Beijing time, SKHX was still in the internal pricing phase, with the oracle primarily adjusting its prices slowly based on the impact prices of TradeXYZ's own order book. Once it reached 7:00 AM, external data would resume, and the oracle would switch back to external prices during the next update.

This switch coincided exactly with the transaction of 868 dollars.

According to on-chain records, at 07:00:21.678, TradeXYZ's "oracle update component" submitted an update to HyperCore: the external price for SKHX was 868.17 dollars, the oracle price was 908.21 dollars, and the two "mark price components" were 921.96 and 954.98 dollars respectively.

The "mark price" is the price that TradeXYZ presents to users and actually uses. TradeXYZ takes the median from three numbers: the oracle price; the oracle price plus the 150-second EMA deviation relative to the mark price of the perpetual contract; and the median of the best bid price, best ask price, and last transaction price on the order book.

This design incorporates TradeXYZ's order book and time smoothing mechanism, which can delay the transmission of abnormal prices, but does not account for the hidden risks deeper within: external pricing may also rely on a market with insufficient liquidity.

In the one minute before 07:00 AM, SKHX opened at 1,128.2 dollars, reached a low of 927 dollars, the contract volume reached 40,978 (contracts), generating a total of 7,501 transaction records. The internal pricing period, meant to limit price discovery within a ±10% boundary, did not prevent this drop, as external pricing had resumed and the system's reference anchor switched to the new external price.

Liquidation Flowing from Traders to System Accounts

Liquidation figures need to be split into two metrics.

According to HyperInsight's detailed statistics on on-chain addresses, the nominal amount of SKHX liquidation in a short time was about 79.398 million dollars, with open contracts decreasing from 481 million dollars to 331 million dollars, a reduction of about 150 million dollars. The top three addresses on the liquidation list collectively experienced liquidations totaling 14.7754 million dollars, among which the address starting with 0x320 incurred the largest liquidation of about 3.957 million dollars, realizing a loss of about 2.045 million dollars.

During this liquidation, about 26.26 million dollars flowed to a special address: 0x4000000000000000000000000000000000000001.

From 07:00:21 to 07:00:48, it took over 406 long accounts, totaling 27,098.687 SKHX contracts at a weighted average price of about 969.05 dollars.

The liquidation process typically first sends forced liquidation orders into the order book. If market buyers can digest the sell orders, positions are closed in the open market; if the order book cannot execute promptly, the margin for the accounts continues to worsen, and the system must transfer the remaining positions out. In this incident, 0x400...0001 played the role of backstop and liquidation transfer.

It passively became long.

The takeover did not end the risk. After the price continued to fall, on-chain records began to list 0x400...0001 as an account being liquidated. That address had a total of 26,560.549 long positions entering the next wave of liquidation, corresponding to a nominal transaction amount of about 24.7374 million dollars, realizing a loss of 1.001 million dollars.

There is also a documentation issue here. TradeXYZ's public page still states that XYZ assets are not protected by the HLP Liquidator Vault, and there is currently no backup liquidator; however, actual on-chain data marks these positions as backstop. Therefore, 0x400...0001 cannot be directly equated with the HLP treasury. A more prudent definition is that it is the system backup account invoked by HyperCore during the SKHX incident. The public documentation has yet to explain the relationship between this current process and the previous version description.

Binance Avoids Trouble This Time by Skipping External Quotes for an Hour

The same transaction in the South Korean spot market also affected Binance's SK Hynix perpetual contracts, but the results were much lighter.

High-frequency trader Boywus made a direct comparison of the two mechanisms: at 7:00 AM Beijing time, TradeXYZ on Hyperliquid had already connected to external quotes in the South Korean pre-market; Binance, on the other hand, remained in the internal pricing phase until around 8:00 AM, near the opening of the main market in Korea, before switching to external quotes.

Binance's official document shows that stock perpetual contracts use the order book impact midpoint when the external market is closed, and use EWMA for smoothing, among other purposes, to reduce opening price jumps and risks of forced liquidation during low liquidity periods. In the first minute of 7:00 AM, the SKHYNIXUSDT index only dropped from 1,132.49 dollars to 1,130.66 dollars;

TradeXYZ had already taken on earlier price discovery at 7:00, while Binance dropped the external quotes for this hour, losing some timeliness but avoiding the impact of directly entering the liquidation system at 868 dollars.

This is unrelated to centralization or decentralization. The difference comes solely from when external prices take over, whether the switching process is smooth, and whether there is independent exceptional value protection for liquidation prices.

Source: @Boywus

Having Reached This Point

Some may argue that TradeXYZ merely reflects the true state of the market. 1,272,000 Korean Won was indeed traded, the data provider made no errors, and all the modules of the trading platform followed established rules to transmit the price on-chain. From this perspective, compensation is difficult to obtain a clear rule basis.

However, correct price discovery does not imply reasonable liquidation design.

Traditional markets have long distinguished between the latest transaction price, index price, and fair price used for risk control. The existence of "mark price" is to prevent a localized transaction from directly determining the fate of highly leveraged accounts. In this incident, although external quotes went through the median, EMA, and the limit on updating range, they still triggered about 80 million dollars in liquidation within a minute, indicating that the existing protection mechanism does not match the depth of the reference market.

Involving more quoting companies cannot solve this problem individually. Multiple data sources observe the same NXT pre-market order book, and a single share's low-price transaction would simultaneously enter their quotes, with the median still tending towards the same anomalous price. The service providers are dispersed, but the underlying liquidity is not.

Hyperliquid has defined and assigned the oracle definition and operational responsibility for the HIP-3 market to the deployers, but the liquidation is executed by HyperCore, meaning the risk and reputation are not limited to the HIP-3 deployers.

Earlier and broader price discovery has value but comes with a cost, hopefully, Hyperliquid and TradeXYZ can learn from this experience.

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