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Hyperliquid SK Hynix Perpetual Plunges After Anomalous Seoul Pre‑Market Print

The episode shows deployer-controlled oracles can transmit isolated off-exchange prints into tokenized-stock perpetuals, triggering mass liquidations.

Overview

  • A SK Hynix perpetual on Hyperliquid briefly dropped about 17.9–20% to roughly $900 before rebounding above $1,000 after a single pre-market trade on South Korea’s NextTrade printed an unusually low price.
  • Trade.xyz deployed and operated the xyz:SKHYNIX market under Hyperliquid’s HIP-3 rules, so its relayer supplied the oracle inputs that passed the NXT print into the contract’s mark-price calculation.
  • On-chain trackers reported roughly $57.4 million in long liquidations across about 960 accounts as open interest fell from an estimated $406–407 million and 24‑hour volume approached $1 billion.
  • Trade.xyz says its oracle followed its published discovery bounds that capped instantaneous moves and explains why a ~28.7% implied NXT print translated into about an 18% perp drop, and the firm has pledged to cover eligible liquidation losses while it tightens tail-event filters.
  • The incident highlights three risk points for tokenized-stock perps: deployer-controlled oracle choice, cross-margin mechanics that enlarge a liquidation blast radius, and thin off‑hour liquidity that lets one off-chain print move a 24/7 crypto derivative.