Bancor Launches Historic Patent War Against Uniswap – Could This $40B DEX Battle Redefine DeFi IP Rights?

Bancor launched a landmark patent lawsuit against Uniswap on May 20, accusing the dominant DEX of eight years of unauthorized use of its patented automated market maker (AMM) technology, threatening to upend DeFi’s open-source foundations and IP norms.

The lawsuit , filed in U.S. District Court for the Southern District of New York by Bancor’s nonprofit Bprotocol Foundation and original developer LocalCoin, claims Uniswap’s protocol infringes on Bancor’s 2017 patents that transformed decentralized trading, demanding damages and challenging how DeFi innovation is protected and monetized.

Legal Tussle Over AMM Patent Infringement Challenges DeFi Ethos

Central to the dispute is Bancor’s claim that it invented and patented the constant product automated market maker (CPAMM) model that powers permissionless on-chain trades through smart contracts.

Bancor noted that it filed the original patent application for its invention on January 8, 2017, and released a white paper the following month.

The Bancor Protocol, launched in June 2017, was the first DEX powered by an AMM model. Bancor was granted two patents and launched the first CPAMM-based DEX that year.

Uniswap, which launched its v1 protocol in 2018, has since grown into the dominant DEX in crypto with over $40 billion in total value locked.

Bancor now alleges that Uniswap has been infringing on its patents from the beginning and has done so without licensing, authorization, or collaboration.

“For the last eight years, Uniswap has been using our patented technology in its projects without our permission. As a result, we have taken legal action to defend our technology for the good of the entire DeFi community,” Bancor’s project lead, Mark Richardson, stated.

The plaintiffs claim that Uniswap’s most recent protocol release, v4 , continues the use of the infringing CPAMM model.

Bancor and LocalCoin are seeking damages and claim that allowing such unlicensed use threatens the incentive structure for innovation across the decentralized finance industry.

“If companies like Uniswap can act unchecked without consequence, we fear it will hinder innovation across the industry to the detriment of all DeFi players,” Richardson added.

The legal challenge brings new attention to intellectual property disputes in a sector that has historically thrived on open-source principles.

Uniswap, often seen as the largest decentralized exchange, has yet to respond publicly. If the case proceeds, it could force the DeFi industry to confront questions about the role of patents and ownership over foundational blockchain technologies.

Court Clears Bancor of U.S. Charges as Uniswap Skates Past SEC Probe

As Bancor steps into a historic intellectual property battle against Uniswap, both protocols are emerging from very different regulatory backdrops.

In September 2024, a Texas federal judge dismissed a securities class action lawsuit filed against Bancor’s operators, citing a lack of U.S. jurisdiction.

The plaintiffs had accused Bancor of misleading investors with its now-suspended impermanent loss protection program, claiming over $2.3 billion was drawn into the protocol under false promises.

But the court found Bancor’s ties to the U.S. too weak, pointing instead to Israel as a more appropriate venue for legal action. The ruling effectively shields Bancor from U.S. securities laws, at least for now.

Meanwhile, Uniswap Labs secured a major win of its own. In February 2025, the U.S. Securities and Exchange Commission dropped its investigation into the firm, nearly a year after issuing a Wells notice .

Bancor now has TVL at $58 million, 98% below its peak in May 2021, according to DeFiLlama.

However, Uniswap is now commanding 23% of daily DEX volume and celebrating a $3 trillion all-time milestone. The coming patent war is shaping up not just as a legal fight but as a defining moment for DeFi’s future.