In a landmark ruling with profound implications for the decentralized finance (DeFi) sector, U.S. District Judge Katherine Polk Failla of the Southern District of New York has dismissed with prejudice the remaining state-law claims in a class-action lawsuit against Uniswap Labs and its founder, Hayden Adams. The decision, issued on February 27, 2025, concludes a case first filed in 2022 that sought to hold the decentralized exchange developer liable for financial losses users suffered from trading scam tokens on its protocol.
The plaintiffs alleged that Uniswap's protocol facilitated fraud by enabling the listing and trading of assets involved in "rug pulls" or pump-and-dump schemes. They pursued claims including aiding and abetting fraud, violations of consumer protection statutes, and unjust enrichment. However, Judge Failla firmly rejected the core legal theory, stating it "defies logic" to hold the drafter of smart contract code liable for misuse by third parties on an open, permissionless protocol. The court found the plaintiffs failed to plausibly allege that Uniswap had actual knowledge of the fraud or engaged in deceptive conduct.
This dismissal follows the earlier rejection of federal securities claims in 2023, which was affirmed by the U.S. Court of Appeals for the Second Circuit. The latest ruling means plaintiffs cannot refile the same claims, providing finality to the legal challenge.
Uniswap Labs General Counsel Brian Nistler hailed the decision as "another precedent-setting" outcome for DeFi, emphasizing the court's rejection of attempts to hold developers liable for third-party misuse of open-source code. Founder Hayden Adams echoed this sentiment, stating, "if open-source smart contract code is used by scammers, the scammers are liable, not the open source devs," calling it a "good, sensible outcome."
The ruling establishes a crucial judicial distinction between providing a neutral, automated trading tool and actively participating in fraud. It reinforces that legal responsibility for scam tokens rests with the anonymous issuers, not the protocol developers, drawing a clear line between the liability of centralized exchanges (which custody funds and curate listings) and decentralized, non-custodial protocols like Uniswap.
Legal experts view the dismissal as a critical precedent for protocol neutrality, offering temporary but essential breathing room for DeFi innovation. However, it does not preclude future, more narrowly tailored regulations. The immediate market reaction saw Uniswap's native UNI token rise approximately 6% to $3.92, buoyed by the legal clarity and a broader market rally.
