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Decentralized exchange GMX suffers $565K price manipulation ‘exploit’

Decentralized exchange GMX suffers $565K price manipulation 'exploit'


Decentralized exchange (DEX) GMX has reportedly suffered a price manipulation exploit from an exploiter who managed to make off with around $565,000 from the AVAX/USD market.

The unidentified exploiter is understood to have capitalized on GMX’s “minimal spread” and “zero price impact” features to pull off the exploit, which impacted GLP token holders who provided liquidity in the form of AVAX (the Avalanche token) to GMX.

GMX confirmed the price manipulation exploit in a Sept. 18 post on Twitter, but stated that the AVAX/USD market would remain open despite imposing a $2 million cap on long positions and $1 million cap on short positions.

Head of Derivatives at Genesis Trading Joshua Lim was one of the first to analyze the exploit, stating that the exploiter “successfully extracted profits from GMX’s AVAX/USD market by opening large positions at 0 slippage” before transferring the AVAX/USD to centralized exchanges at a slightly higher price.

Lim said this exploit method was repeated five times, with the first cycle taking effect at 01:15 UTC on Sept. 18. Each cycle transferred more than 200,000 AVAX tokens, (roughly $4-5 million per cycle) with the exploiter extracting about $565,000 in profit after paying spread to market makers on other exchanges.

Lim however noted that this wasn’t an “exploit” in that it was “GMX working as designed.”

Technical analyst “Duo Nine” added that the exploiter was able to take advantage of several large trades against GLP holders because the fixed prices supplied by the Chainlink-run oracles come with no price impact, which is what made the price manipulation exploit possible.

“If traders make profit, the liquidity providers lose. If traders exploit this vulnerability, the GLP holders may lose all their money!”

While GMX immediately capped short and long open interest for AVAX/USD to protect the DEX from further manipulation, Lim said that GMX may…

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