Exactly Protocol is a dual fixed-and-variable rate lending protocol on Optimism (primary) and Ethereum that creates a unified system where users can choose between borrowing or lending at fixed rates with defined maturity dates via Fixed Rate Pools, or use the protocol’s Variable Rate Pool functioning similarly to Aave’s standard supply/borrow model. In the Fixed Rate Pools, interest rates for each maturity (7-day, 30-day, 90-day periods) are set by the protocol’s embedded interest rate model but quoted upfront to users, providing rate certainty: a user who borrows USDC at 4.5% fixed for 30 days pays exactly 4.5% annualized for 30 days regardless of protocol borrow demand afterward. The Variable Rate Pool provides Aave-like flexible borrowing with no maturity date, at rates that adjust continuously. Both pools share the same collateral system: users post collateral to the Variable Pool and can access either fixed or variable borrowing against it. The coexistence of fixed and variable pools within a single protocol design creates an implicit yield curve: the 7-day fixed rate, 30-day fixed rate, and 90-day fixed rate represent the market’s term structure within Exactly’s system, although rates are set by algorithm rather than auction (unlike Term Finance). EXA is Exactly’s governance token, distributed through staking and protocol participation incentives. Exactly launched on Optimism in mid-2022 and received Optimism’s OP token incentives as part of OP Stack ecosystem development grants, which bootstrapped initial TVL.
Key Facts
- Protocol: Exactly Protocol
- Networks: Optimism (primary), Ethereum
- Governance token: EXA
- Products: Fixed Rate Pools + Variable Rate Pool
- Fixed maturities: 7 days, 30 days, 90 days (typical)
- Rate setting: Algorithmic (not auction-based)
- TVL: $20-50M (2023-2024)
- Differentiation: Integrated fixed + variable in single protocol; Optimism-native
Fixed Rate Pool Architecture
Fixed Rate Pools are organized by asset and maturity:
- Pool: USDC · 30-day | Supply rate: 4.2% | Borrow rate: 5.0%
- Pool: ETH · 30-day | Supply rate: 2.1% | Borrow rate: 3.5%
- Pool: WBTC · 30-day | Supply rate: 1.8% | Borrow rate: 2.9%
User actions within Fixed Rate Pools:
- Lend (supply): Lock USDC into 30-day pool → receive fixed 4.2% APY for 30 days
- Borrow: Post ETH collateral → borrow USDC at fixed 5.0% APY for 30 days
- At maturity: Lenders withdraw principal + interest; Borrowers must repay or rollover
Rate model: Rates adjust based on pool utilization (higher utilization = rates rise) but are locked for each individual user at time of entry
Variable Rate Pool
The Variable Rate Pool mirrors Aave’s standard mechanism:
- Deposit any time, earn variable APY
- Borrow any time, pay variable APY
- No maturity date
- Rates adjust algorithmically (utilization model)
- Can be used as collateral bridge for Fixed Rate Pool borrowing
Exactly vs. Term Finance and Notional
| Feature | Exactly | Term Finance | Notional |
|---|---|---|---|
| Rate mechanism | Algorithmic (utilization) | Auction (sealed-bid) | AMM (fCash) |
| Variable pool | Yes (integrated) | No | Limited |
| Network | Optimism primary | Ethereum | Ethereum |
| Rate discovery | Model-based | Market-clearing | AMM price |
| UX complexity | Medium | Medium-High | High |
Related Terms
Sources
- “Exactly Protocol: Fixed-Rate Lending Meets Variable-Rate Flexibility” — Exactly Protocol Whitepaper / Technical Documentation (2022). Technical documentation of Exactly Protocol’s dual-pool architecture — detailing the fixed-rate pool lifecycle (entry, rate locking, maturity, withdrawal), the interest rate model governing fixed pool rates (utilization-based similar to Aave but applied to determine fixed entry rates), the relationship between Variable Pool and Fixed Rate Pools in the integrated collateral system, and the protocol’s design philosophy of offering choice between rate certainty and flexibility within a single unified collateral system.
- “Optimism and Exactly: How OP Incentives Bootstrap Fixed-Rate DeFi” — Blockworks / Optimism DeFi Ecosystem (2022-2023). Analysis of how Exactly Protocol leveraged Optimism’s RetroPGF and ecosystem incentive programs to establish TVL on a nascent chain — examining the distribution of OP tokens to Exactly depositors, the resulting user acquisition economics, and how Optimism’s ecosystem support enabled Exactly to reach $30M+ TVL where a purely organic launch would have been slower.
- “Variable vs. Fixed: The UX Tradeoffs of Maturity-Based Lending” — DeFi Research / User Experience Analysis (2023). Analysis of the user experience differences between variable-rate lending (Aave) and maturity-based fixed-rate lending (Exactly, Term Finance) — examining why variable rate dominates in TVL despite fixed rate’s theoretical benefits, the cognitive load of managing maturity dates, the liquidity risk of being locked into a fixed position when better rates emerge, and what UX improvements could make fixed-rate DeFi more accessible.
- “EXA Token: Governance and Value Accrual in Exactly Protocol” — Token Terminal / EXA Analysis (2023). Analysis of Exactly Protocol’s EXA governance token — examining its distribution model (protocol emissions to liquidity contributors), governance rights (parameter setting, protocol upgrades, treasury management), value accrual mechanisms (protocol fee distribution to EXA stakers), tokenomics, and whether EXA represents “real yield” (Protocol fee sharing) or emission-based yield.
- “Exactly Protocol Security: Audit History and Smart Contract Risk” — Code4rena / Exactly Security Analysis (2023). Analysis of Exactly Protocol’s smart contract security practices — examining the audit reports from multiple firms (Coinspect, ABDK Consulting), the Code4rena competitive audit contest results, specific findings (severity levels, mitigations), design decisions that reduce attack surface (immutable core, minimal admin privileges), and residual risks in the fixed-rate pool accounting mathematics.