Uniswap v4 pools whose fee rises with volatility, so liquidity providers lose less to arbitrage.

Official links: Website (armsys.xyz) · @armsysxyz (x.com) · DefiLlama (defillama.com)

What ARMSys does

• Dynamic fee hook: 0.9 bp in calm markets up to 250 bp retail / 1000 bp MEV
• Live Robinhood Chain pools: NVDA/USDG, INTC/USDG, SPCX/USDG
• Also live on Base (ETH/USDC)
• Provide liquidity through the Uniswap app on ARMSys pools

LPs earn the pool's swap fee, which the hook raises when realized volatility rises; no protocol fee is described on the site.

ARMSys is a Uniswap v4 dynamic-fee hook that raises the fee when a pool is about to be arbitraged, so liquidity providers keep more of what they would otherwise lose to loss-versus-rebalancing — the quiet tax LPs pay to arbitrageurs on every price move. It also runs on Base. Its site publishes the Robinhood Chain hook and pools for NVDA/USDG, INTC/USDG and SPCX/USDG, and states that it is unaudited.

• On Robinhood Chain since: 2026-08
• Token: No token
• Audits: None published

ARMSys news

• 2026-09-05 — ARMSys fees adapter (Base + Robinhood Chain) merged into DefiLlama

ARMSys contracts on Robinhood Chain

• ARMSys dynamic-fee hook 0x20f8b7ec9cc3bb5c739dedb15a8b4275f84b00c8

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