Papertrade Faces BBO Manipulation Allegations on HyperEVM
Papertrade, a perpetual trading platform built on HyperEVM, is facing allegations that traders exploited its pricing mechanism by manipulating the best bid and offer (BBO) on Hyperliquid. An X user identified as @Dr_bobo54 alleged that two wallets used orders worth roughly $20 million on Hyperliquid to shift ETH quotes by 10–20 basis points while maintaining substantially larger long positions on Papertrade.
The allegations raise questions about the vulnerability of pricing systems that rely on external market quotes to execute trades. According to Wu Blockchain the claims, the wallets could influence the reference price used by Papertrade through activity on Hyperliquid, potentially affecting the execution of positions on the separate platform.
How the Alleged Pricing Exploit Worked
Papertrade reportedly uses the midpoint between Hyperliquid's best bid and best offer as its execution price. The best bid represents the highest price buyers are offering, while the best offer is the lowest price sellers are willing to accept. The midpoint is calculated from those two quotes.
According to @Dr_bobo54, two wallets placed orders worth approximately $20 million on Hyperliquid to move ETH quotes by 10–20 basis points. At the same time, the wallets allegedly held much larger long positions on Papertrade. The claim suggests that changes in Hyperliquid's quotes could influence the price used to execute trades on Papertrade, creating a potential opportunity for traders with positions on both platforms.
The reported figures describe the alleged markets size of the orders and the movement in ETH quotes. They do not, by themselves, establish the total value of the positions held on Papertrade or quantify any resulting profit or loss.
Protocol Risk Previously Identified
Trader Rune noted that Papertrade's own documentation identifies BBO manipulation as an unresolved protocol risk. That reference indicates the possibility of manipulating the pricing input had been acknowledged in the platform's documented risk disclosures.
Using the midpoint of an external order book can expose an execution mechanism to changes in the underlying bid and offer quotes. However, the presence of a documented risk does not independently establish that the alleged wallets successfully exploited it or that the reported activity caused financial damage.
The allegations have not been independently verified, and Papertrade has not confirmed any losses. The available claims therefore do not establish whether the reported activity resulted in realized gains for the wallets, losses for other traders, or any measurable financial impact on the platform.
The case centers on the relationship between Hyperliquid's BBO quotes and Papertrade's execution pricing on HyperEVM. The specific allegation is that orders worth roughly $20 million moved ETH quotes by 10–20 basis points while the traders held much larger long positions on Papertrade.
Writer: Victoria HaleTechnology & Blockchain WriterVictoria Hale writes about blockchain technology, digital infrastructure, and the intersection of emerging technologies with finance. Her articles explore how new protocols and systems are shaping the evolving digital economy.She prioritises clarity and accuracy when explaining technical developments to a general audience.
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