Overview
Centuari matches lenders and borrowers at agreed-upon fixed rates through an order book mechanism. Liquidity flows from multiple chains to Arbitrum, where all matching and execution occurs.
The Hybrid Order Book Model
Unlike pool-based protocols (Aave, Compound) where rates are algorithmically determined, Centuari uses a hybrid order book where users explicitly state their desired rates.Lenders Post Orders
“I want to lend 10,000 USDC at 8% APY for 90 days”
Borrowers Post Orders
“I want to borrow 10,000 USDC at 8% APY for 90 days”
Hybrid Architecture
Off-chain Orders, On-chain Settlement: Orders are stored and matched off-chain for speed and zero gas costs. Settlement happens on Arbitrum smart contracts for security and trustlessness.
| Component | Location | Purpose |
|---|---|---|
| Order Storage | Off-chain | Fast order placement & cancellation |
| Order Matching | Off-chain | Instant matching engine |
| Settlement | On-chain (Arbitrum) | Trustless execution of matched orders |
| Position Management | On-chain | CBT tokens, collateral, redemptions |
Cross-Chain Architecture
Arbitrum is the home chain. All core protocol activity and capital execution happens on Arbitrum, with liquidity aggregated from multiple source chains.
Supported Chains
| Chain | Status | Role |
|---|---|---|
| Arbitrum | ✅ Live | Home chain (execution) |
| Ethereum | ✅ Live | Liquidity source |
| Polygon | ✅ Live | Liquidity source |
| Optimism | ✅ Live | Liquidity source |
| Base | ✅ Live | Liquidity source |
How Cross-Chain Works
Gas Fees Explained
Centuari minimizes gas costs through its hybrid architecture:What’s Gasless
| Action | Gas Cost | Notes |
|---|---|---|
| Placing orders | $0 | Off-chain, no gas |
| Canceling orders | $0 | Off-chain, no gas |
| Modifying orders | $0 | Off-chain, no gas |
| Order matching | $0 | Off-chain matching engine |
What Requires Gas
| Action | Gas Cost | Notes |
|---|---|---|
| Depositing funds | Very low | On-chain (Arbitrum) |
| Withdrawing funds | Very low | On-chain (Arbitrum) |
| Settlement | Very low | On-chain after order match |
Why Arbitrum? Arbitrum’s L2 scaling means gas costs for deposits/withdrawals are typically under $0.10, a fraction of Ethereum mainnet costs.
Cross-Chain Bridging
When depositing from other chains (Ethereum, Polygon, etc.), bridging fees apply. Fast bridging is used for quick settlement, typically completing within minutes.Position Lifecycle
For Lenders
For Borrowers
The Centuari Bond Token (CBT)
When lenders’ orders are matched, they receive CBT representing their position.- What is CBT?
- Example
- Why It Matters
CBT is a tokenized lending position that behaves like a Zero Coupon Bond:
- You receive more CBT than your deposit (at a discount price per token)
- Each CBT is worth exactly $1 at maturity
- The extra CBT represents your fixed interest
Matching Mechanism
Orders are matched using a price-time priority algorithm:- Best price first: Orders offering better rates match first
- Time priority: Among equal rates, earlier orders match first
- Partial fills: Large orders can be filled across multiple counterparties
Liquidity providers can earn the spread by posting both lend and borrow orders, similar to market makers on traditional exchanges.
Key Protocol Parameters
| Parameter | Value | Description |
|---|---|---|
| Maturity dates | 1st of month | Predetermined dates, max 3 active |
| Minimum order size | 1 USDC | Smallest order allowed |
| Collateral ratio | 110-150% | Varies by asset type |
Predetermined Maturity System
Centuari uses a rolling system of predetermined maturity dates:- All positions mature on the 1st of each month
- Maximum 3 maturity dates active at any time
- Auto-rotates when nearest maturity passes
What Happens at Maturity
Lenders
- Auto rollover ON: Position automatically extends at current market rate
- Auto rollover OFF: Receive principal + interest in your wallet
Borrowers
- Auto refinance ON: Loan automatically rolls to best available rate
- Auto refinance OFF: Must repay loan or face liquidation
Security Model
Smart Contract Security
Smart Contract Security
All contracts are audited by multiple firms and covered by bug bounty.
Collateral Management
Collateral Management
Borrower collateral is held in secure vaults with automated liquidation.
Cross-Chain Bridges
Cross-Chain Bridges
Only battle-tested bridge infrastructure is used for cross-chain transfers.
Dive deeper
Explore the Fixed Rate product in detail