Crypto Gloss

Cetus Protocol

Cetus Protocol is the leading DEX and concentrated liquidity market maker (CLMM) on Sui and Aptos — the primary liquidity venue for the Move-language blockchain ecosystem — featuring Uniswap V3-style range liquidity, a composability SDK for other Sui dApps to embed swaps, and a vault ecosystem for automated CLMM position management.

Overview

Cetus Protocol launched in 2023 as Sui and Aptos opened their mainnets, positioning itself as the essential liquidity infrastructure for Move-based blockchains. On Sui specifically, Cetus achieved dominant market position as the first and largest CLMM DEX — similar to how Uniswap V3 defined Ethereum’s liquidity layer. Cetus is notable for its composability focus: other Sui DeFi protocols (lending, options, aggregators) integrate Cetus pools via SDK, making it the foundational liquidity layer for Sui DeFi rather than just a standalone exchange.

Concentrated Liquidity Market Maker (CLMM)

Cetus’s CLMM architecture is modeled on Uniswap V3:

Ticks and Ranges

  • Liquidity provided within a chosen price range (e.g., SOL/USDC between $100-$200)
  • Concentrated within range → higher capital efficiency vs standard flat AMM
  • Position represented as NFT (each LP position is a unique range with its own state)
  • Earns swap fees only when price is within the LP’s chosen range

Dynamic Fee Tiers

Cetus supports multiple fee tiers on the same trading pair:

  • 0.01% — for highly pegged stable pairs (USDC/USDT)
  • 0.05% — for correlated assets (wETH/stETH equivalent)
  • 0.25% — standard volatile pairs
  • 1.00% — high-volatility/exotic pairs

Flash Swap Mechanism

Cetus supports flash swaps:

  • Borrow tokens from Cetus pool in same transaction block
  • Execute arbitrage or other logic
  • Repay within the same transaction
  • Enables complex Sui atomic composability patterns

Sui-Specific Features

Cetus takes advantage of Sui’s object-centric model:

Object-Based Liquidity Positions:

  • Each LP position is a Sui “object” — owned directly by user wallet
  • Not tracked via mapping in a contract; directly owned object
  • Enables direct position transfers without contract interaction

Programmable Transaction Blocks (PTBs):

  • Sui’s chaining of transactions into atomic blocks enables complex multi-step strategies
  • Cetus integrates with PTBs for one-Tx leveraged LP entry and multi-pool arbitrage

Cetus Vault System

Automated CLMM position management:

  • Auto-rebalance vaults — repositions LP ranges when price exits a range
  • Auto-compound vaults — claims fees and reinvests automatically
  • Managed by Cetus’s keeper infrastructure
  • LP token (vault receipt) is fungible — unlike raw CLMM NFT positions

CETUS Token

  • Governance — CETUS holders vote on protocol parameters, new supported assets, fee settings
  • xCETUS — locked CETUS with governance weight and fee share (vote-escrow model)
  • Emissions directed to liquidity pools via xCETUS gauge voting
  • Farmed by LPs in all Cetus pools proportional to liquidity size and pool weights

Aptos Deployment

Cetus operates on Aptos as well as Sui:

  • Aptos deployment uses the same CLMM architecture adapted for Aptos’s Move VM
  • Aptos pools have lower TVL than Sui but provide liquidity for Aptos DeFi ecosystem
  • Different token markets vs Sui due to distinct token economies

Exploit (May 2025)

On May 22, 2025, Cetus Protocol suffered a critical exploit caused by an integer overflow vulnerability in its concentrated liquidity contracts. An attacker manipulated the AMM pricing math to drain approximately $223M in liquidity from Cetus pools on Sui.

In an unprecedented response, the Sui Foundation and validators voted to freeze the attacker’s on-chain address at the validator level, preventing the attacker from moving the stolen funds. Approximately $162M was frozen on-chain; roughly $61M had already been bridged out before the freeze was enacted. Most of the frozen funds were subsequently returned to Cetus for creditor recovery.

The validator-level address freeze was highly controversial in the broader crypto community: it demonstrated that a majority of Sui validators could effectively blacklist any address, raising concerns about censorship resistance and whether Sui is truly a permissionless network. The Cetus team described it as a necessary emergency measure.

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