Crypto Gloss

DeepBook

DeepBook is Sui Network’s native on-chain central limit order book (CLOB), built by Mysten Labs as shared public infrastructure — providing a matching engine that any Sui dApp can use as their liquidity layer, enabling professional-grade order book trading with maker-taker fees without each protocol deploying its own order book.

Overview

DeepBook launched on Sui mainnet as a first-party infrastructure primitive, co-developed by Mysten Labs (Sui’s core development team). Unlike traditional DeFi DEXes that each operate their own liquidity pool, DeepBook is a shared order book used by multiple protocols — Sui’s answer to Serum on Solana. Any Sui application can post bids/asks to DeepBook, route swaps through it, or build trading UIs on top of it. This creates a public good liquidity layer: the more protocols integrate DeepBook, the deeper the shared order book becomes for all participants.

Architecture

The protocol is built around the following components.

Central Limit Order Book (CLOB) Design

DeepBook implements a classic price-time priority CLOB:

  • Price levels — discrete bid/ask price levels forming the limit order book
  • Time priority — within a price level, earlier orders execute first
  • Matching engine — atomic order matching in a single Sui transaction or PTB
  • Maker-taker model — makers (limit orders) earn rebates; takers (market orders) pay fees

Shared Object Model

On Sui, DeepBook’s order book is a “shared object” — accessible by all Sui transactions:

  • Multiple protocols can read and write to the same DeepBook pool in the same transaction block
  • Enables high-frequency market making and arbitrage impossible on single-owned-object designs
  • Programmable Transaction Block (PTB) support: complex multi-step order strategies in one atomic transaction

Pool Structure

Each DeepBook “pool” pairs two assets:

  • Separate pools for each base/quote asset pair (e.g., SUI/USDC, WBTC/USDC)
  • Pool parameters: lot size (minimum order), tick size (minimum price increment)
  • Trading fees configurable per pool; lower for pools with committed market makers

DeepBook V3

DeepBook V3 launched in 2024 with major upgrades:

  • DEEP token integration — fee payment and maker rebates in DEEP token
  • Governance — DEEP holders govern pool parameters, tick sizes, fee rates
  • Improved matching engine — higher throughput, flash liquidity borrowing
  • Vault system — protocols can pre-stage funds in a vault for faster order execution

DEEP Token

DEEP is DeepBook V3’s native token:

  • Fee payment — traders pay fees in DEEP (discounted vs USDC fee payment)
  • Maker rebates — market makers receive DEEP rebates for liquidity provision
  • Staking — staked DEEP grants governance rights and enhanced maker rebates
  • Distributed to early liquidity providers and Sui ecosystem participants

Integration by Other Protocols

Because DeepBook is public infrastructure, many Sui protocols use it:

  • Cetus — routes swaps through DeepBook for certain stable pairs
  • Aftermath — integrates DeepBook for token launches and price discovery
  • Sui DEX aggregators — route orders through DeepBook when it has better pricing than CLMMs
  • Market making bots — institutional market makers maintain DeepBook depth for key pairs

Comparison to Serum/OpenBook (Solana)

DeepBook fills the same role on Sui that Serum (now OpenBook) fills on Solana:

  • Shared on-chain CLOB used by the entire ecosystem
  • First-party development by the L1 team (Mysten Labs vs Serum’s Project Serum/FTX)
  • Neutralized from single-entity control (unlike Serum’s FTX dependency)

Sources

Related Terms