Avi Eisenberg Wins: Judge Vacates Mango Markets Fraud Convictions

Avi Eisenberg had all $110M Mango Markets exploit convictions overturned on May 23, 2025, when Judge Arun Subramanian vacated his fraud and manipulation charges. However, Avi Eisenberg was separately sentenced to 52 months for possessing 1,200+ CSAM images discovered during his 2022 arrest.

The $110M Mango Markets Exploit Explained

Avi Eisenberg was charged in January 2023 and later convicted after a nine-day jury trial in April 2024 for exploiting a critical vulnerability in Mango Markets, a decentralized crypto exchange. The platform offered trading in its native MNGO token, MNGO Perpetual contracts (a kind of perpetual futures derivative), and allowed users to borrow assets against the value of their portfolios.

On October 11, 2022, Avi Eisenberg deposited $5 million in USDC into two accounts on Mango Markets. He used these to create offsetting long and short positions in MNGO Perpetuals, thereby controlling both sides of the market. He then purchased large amounts of MNGO on exchanges that fed Mango’s price oracle (FTX, AscendEX, Serum), dramatically inflating the token’s price and the notional value of his long position.

Using that inflated value as collateral, Avi Eisenberg borrowed over $100 million from Mango Markets. Minutes later, he dumped the MNGO tokens, crashing the price and boosting the value of his short position. He borrowed again, withdrew more funds, and disappeared—only to later return $67 million in a DAO-mediated settlement.

Mango Markets Exploit Timeline

October 11, 2022: Avi Eisenberg deposits $5M USDC into two Mango Markets accounts

Price Manipulation Phase: Purchases MNGO on FTX, AscendEX, and Serum to inflate price

Borrowing Phase: Uses inflated collateral value to borrow $100M+

Dump Phase: Sells MNGO, crashing price while profiting from short positions

Settlement: Returns $67M to DAO, keeping roughly $43M

In a statement on the exploit, Avi Eisenberg admitted to engaging in the conduct but asserted that his actions were legal. This argument—that he merely used the protocol as designed—formed the core of his defense strategy throughout criminal proceedings.

Why Judge Overturned Avi Eisenberg’s Convictions

On May 23, 2025, Judge Arun Subramanian issued a 35-page opinion granting Avi Eisenberg’s Rule 29 motion for acquittal, wiping away his convictions. The ruling—detailed, fact-heavy, and legally rigorous—rested on two key legal deficiencies in the government’s case: improper venue and failure to prove material misrepresentation for wire fraud.

1. Venue Failures on Commodities Charges

The Court found that the government failed to prove any essential part of the commodities offenses occurred in the Southern District of New York. Avi Eisenberg executed all transactions from Puerto Rico. The prosecution argued that monitoring activities in Manhattan by AscendEX’s vendor (HD Consulting) and a Mango Markets user in Poughkeepsie who attempted withdrawing funds were enough to establish venue.

The Court flatly rejected this, holding that neither constituted “essential conduct elements” of the offense, as required by the Constitution and federal venue doctrine. This ruling reinforces constitutional requirements that criminal trials occur in the correct venue—a safeguard with growing importance in internet-native crime where physical location becomes ambiguous.

2. Legal Misfit for Wire Fraud

The wire fraud conviction was overturned both for venue and for lack of material misrepresentation. Mango Markets had no terms of service, no prohibition against manipulation, and no requirement that loans be repaid. The Court found that while Avi Eisenberg gamed the system, he did not make a materially false statement or deception sufficient to constitute fraud under 18 U.S.C. § 1343.

“That word [‘borrow’] could have been ‘Access Collateral,’ ‘Utilize Assets,’ or anything else for that matter,” Subramanian wrote. Without rules or promises, there was no fraud—just an exploit. This distinction proves critical: exploiting poorly designed smart contracts differs legally from fraudulent misrepresentation, even if outcomes appear similar.

3. Commodities Fraud and “Mixed Swaps”

The government argued that Avi Eisenberg manipulated a “mixed swap,” a derivative type subject to the Commodity Exchange Act. The Court found that MNGO Perpetual was indeed a mixed swap because its valuation was based on both MNGO (a security) and a “funding rate” tied to USDC (a currency), bringing it under CEA jurisdiction. Nonetheless, the judge ruled that the conviction must be vacated due to venue failure, even though there was sufficient evidence of a “manipulative device.”

Avi Eisenberg’s CSAM Conviction And 52-Month Sentence

While Avi Eisenberg’s crypto-related convictions were overturned, he was separately sentenced to 52 months in federal prison for possessing child sexual abuse material (CSAM). Federal agents discovered over 1,200 images and videos of CSAM on his computer during his December 2022 arrest. The sentencing took place on May 1, 2025, in the US District Court for the Southern District of New York.

Although Avi Eisenberg was not accused of producing or distributing the material, prosecutors argued that mere possession contributes to continued exploitation of victims by sustaining demand. A federal prosecutor stated during sentencing that it “creates a market for these types of materials that otherwise wouldn’t exist.”

Judge Subramanian noted mitigating factors including Avi Eisenberg’s autism diagnosis and significant psychological trauma. Defense attorney Sanford Talkin pointed to his client’s upbringing in an ultra-Orthodox Jewish community in Rockland County, New York, as a source of psychological repression, emotional immaturity, and limited sexual awareness. Talkin suggested Avi Eisenberg may have been a victim of abuse himself, referencing “at least two situations” involving “unthinkable” acts inflicted during childhood.

Before handing down the sentence, Judge Subramanian acknowledged Avi Eisenberg’s efforts to understand the harm caused by his crimes but emphasized that a prison term was necessary, particularly as a deterrent against CSAM proliferation. He underscored the severity by reading statements from three witnesses during the hearing. The average federal sentence for CSAM possession is approximately four years, making Avi Eisenberg’s 52-month term (4.3 years) slightly above average.

Avi Eisenberg will serve his sentence at FCI Otisville, a medium-security facility in New York, and will undergo five years of probation after release. His probation includes stringent conditions: monitoring software on all digital devices and mandatory participation in a drug treatment program.

Importance Of The Ruling For DeFi

This decision is among the most significant legal outcomes yet in crypto-related criminal enforcement—and the first to decisively reject a high-profile DeFi fraud conviction. It underscores the challenges prosecutors face in applying traditional criminal laws to borderless, algorithmically-mediated financial activity.

The ruling reinforces constitutional venue requirements, a safeguard with growing importance in internet-native crime. Perhaps most importantly for decentralized finance, the case highlights how legal boundaries around fraud, manipulation, and permissible on-chain behavior remain in flux.

Avi Eisenberg’s exploit was not found legally innocent in substance—he still faces civil suits from the SEC and CFTC—but the criminal case could not survive the procedural and evidentiary burdens of U.S. law. Judge Subramanian’s ruling stands as a watershed moment for the intersection of DeFi and federal criminal law, signaling both the limitations of current enforcement tools and the evolving legal framework needed to address financial misconduct in decentralized markets.

Potential Retrial And Ongoing Legal Battles

Despite his CSAM sentencing, Avi Eisenberg continues fighting his Mango Markets conviction. His legal team argues that prosecutors failed to prove he acted with criminal intent, insisting he operated within the platform’s own rules and did not personally profit beyond controlling market conditions. They are seeking either full dismissal of charges or a retrial.

Prosecutors, however, maintain that Avi Eisenberg knowingly engaged in fraudulent behavior and cite a previous lawsuit he filed against another individual for market manipulation as evidence he understood the legal boundaries he later crossed. After being publicly identified as the Mango Markets exploiter, Avi Eisenberg fled to Israel—an action the government sees as tacit acknowledgment of guilt.

FAQ

Will Avi Eisenberg face retrial for Mango Markets?

Possible. Judge Subramanian indicated he may grant defense motion for retrial or acquittal, citing venue issues and questions about the government’s classification of MNGO Perpetual as a “swap.” The decision remains pending.

How much did Avi Eisenberg steal from Mango Markets?

Avi Eisenberg exploited Mango Markets for over $110 million but returned $67 million in a DAO-mediated settlement, keeping approximately $43 million.

Why were Avi Eisenberg’s crypto convictions overturned?

Judge Subramanian ruled the government failed to prove venue in Southern District of New York (all transactions occurred from Puerto Rico) and that Mango Markets had no terms of service or prohibition against manipulation, meaning no material misrepresentation occurred for wire fraud charges.

What is Avi Eisenberg’s current legal status?

Avi Eisenberg is serving 52 months at FCI Otisville for CSAM possession. His Mango Markets convictions are vacated pending potential retrial. He also faces ongoing SEC and CFTC civil lawsuits.

Did Avi Eisenberg profit from the Mango Markets exploit?

After returning $67M, Avi Eisenberg kept approximately $43M. However, his legal defense argues he didn’t “profit” but rather used the protocol as designed without breaking any stated rules.

What does this ruling mean for DeFi?

The decision highlights that exploiting smart contract vulnerabilities may not constitute criminal fraud if platforms lack explicit terms of service or anti-manipulation rules. However, civil liability and regulatory actions remain possible.