Worked example · 2026-10

Papertrade — a 1,000x exchange priced every trade off Hyperliquid's bid/ask midpoint, so a trader moved that midpoint by a few dollars — Papertrade / HyperEVM (Hyperliquid) — 2026-10-10

Loss

~$1.28M profit to one wallet (0x2025…840e) on ~$3.18B Papertrade volume on launch day, per The Block's review of trading data; the wallet withdrew ~$2.48M against ~$1.2M deposited. Papertrade's pool fell from ~$5M to ~$2.4M before recovering. A later 30-short position was liquidated for a ~$450K loss. Papertrade says the trader returned most gains through new accounts; unverified.

OAK Techniques observed

OAK-T17.001 (Cross-Venue Arbitrage-Driven Price-Discovery Distortion — primary. Papertrade prices every trade at the midpoint of Hyperliquid's best bid and offer. The wallet held large leveraged Papertrade positions while buying ~6,060 ETH on Hyperliquid (lifting ETH ~$3, 0.12%), selling ~5,210 ETH (dropping it ~$3.50), and later selling ~6,590 ETH into 660x shorts. At up to 1,000x, a 0.1% move on the reference venue is a full-margin payout on the derived one. See techniques/T17.001-cross-venue-arbitrage-price-distortion.md). No key, contract or authorisation was bypassed.

Attribution

pseudonymous. First flagged by X users Boblob and butler.

Key teaching point

Leverage divides the cost of moving your price feed. About $52K of Hyperliquid fees bought ~$1.28M because the venue's price was a single book's top-of-book and its open-interest caps let one account hold positions far larger than the depth behind that price. Papertrade calls it loose launch caps, not a design flaw; either way, the cap is what bounded the loss, and it was set for demand rather than for the cost of manipulation.