Exactly Protocol is a fixed and variable rate DeFi lending protocol on Optimism and Ethereum that enables users to lend or borrow at fixed interest rates for specific maturity windows (e.g., 28-day or 182-day fixed terms) using a dynamic pricing model where fixed rates adjust based on utilization of each individual maturity pool — borrowing heavily from traditional finance’s yield curve concepts (term structure of interest rates) and bringing them on-chain — alongside traditional variable rate pools, with EXA as the governance token allowing holders to vote on market parameters, rate models, and new asset listings.
How It Works
- Fixed rate pools by maturity — Exactly creates separate fixed-rate liquidity pools for each maturity date (e.g., the USDC 28-day pool, the USDC 91-day pool). Users who lend to a fixed pool agree to lock their funds until that maturity for a guaranteed fixed APR.
- Fixed rate borrowing — Borrowers can borrow at a fixed rate from a maturity pool. The rate is determined by the pool’s utilization curve — higher utilization = higher borrowing rate (similar to variable rate models but applied per maturity slot).
- Variable rate pools — Alongside fixed-rate pools, Exactly maintains variable rate pools (similar to Aave or Compound). Deposits that are not committed to specific maturities earn variable rates.
- Early repayment and withdrawal — Fixed-rate loans can be repaid early (with penalty). Fixed-rate deposits can be withdrawn early by swapping into the variable pool at current market rates.
- Yield curve — Because Exactly has fixed rates across multiple maturities simultaneously, it creates an on-chain yield curve — a term structure showing interest rates at different time horizons, providing a form of price discovery for term funding in DeFi.
- EXA governance — EXA holders vote on supported assets, maturity windows, rate parameters, and treasury allocation on Exactly’s DAO.
Tokenomics
| Parameter | Value |
|---|---|
| Ticker | EXA |
| Max supply | 10,000,000 (10 million) |
| Distribution | Community (liquidity incentives), team/investors, treasury |
| Governance | EXA holders vote on protocol parameters |
| Chain | Optimism (primary), Ethereum mainnet |
Use Cases
- Fixed-rate borrowing — Lock in a known borrowing rate for a defined period, unlike variable-rate borrowing on Aave where rates change daily.
- Fixed-rate lending — Earn a guaranteed APR by providing liquidity for a fixed term.
- Yield curve construction — DeFi-native on-chain term structure for rate discovery.
- Basis trades — Sophisticated users can trade fixed vs. variable rate differentials.
History
- 2022-Q3 — Exactly Protocol is founded by a Latin American team (Argentina-based). The protocol development focuses on bringing fixed-rate lending to DeFi, a segment that Notional Finance and Yield Protocol had pioneered on Ethereum mainnet.
- 2022-11 — Exactly Protocol launches on Optimism mainnet. Choosing Optimism allows lower gas costs (important for smaller loans and fixed-rate mechanics that require maturity settlement transactions).
- 2023 — Exactly is audited and listed on Optimism’s ecosystem DeFi lineup. TVL grows as users discover the fixed-rate lending mechanics. EXA token launches with liquidity incentive distributions.
- 2023-08-18 — Exactly Protocol suffers a security exploit where approximately $7.3 million is stolen through a vulnerability in the DebtManager periphery contract. The exploit is front-run by a MEV bot. The funds are not recovered. Exactly patches the vulnerability and continues operating.
- 2024 — Exactly continues operating on Optimism post-hack with recovered (though reduced) TVL. The protocol represents one of a small group of on-chain fixed-rate lending protocols alongside Notional (Ethereum), Pendle (fixed yield), and Yield Protocol.
Common Misconceptions
“Fixed rate lending in DeFi is risk-free.”
Fixed rates reduce interest rate risk (rate variability) but not smart contract risk, liquidation risk, or protocol insolvency risk. Exactly’s August 2023 exploit demonstrates that fixed-rate mechanics do not eliminate protocol-level security risk.
“Exactly’s yield curve is the same as TradFi yield curves.”
Exactly’s yield curve reflects utilization-based DeFi supply/demand at each maturity. It is not driven by central bank policy, inflation expectations, or credit risk like government bond yield curves. However, it does provide genuine on-chain price discovery for term lending/borrowing rates.
Last updated: 2026-04