Crypto Gloss

Inverse Finance

Inverse Finance is a community-governed DeFi protocol issuing DOLA — a USD-pegged decentralized stablecoin — and operating FiRM, an innovative fixed-rate borrowing market where users lock DBR (DOLA Borrowing Rights) tokens to pre-pay their borrowing costs at a known rate rather than facing variable interest.

Overview

Founded in 2020, Inverse Finance began as a leveraged yield farming platform before evolving into a stablecoin and lending protocol. Its most significant products are DOLA (a USD-pegged stablecoin backed by a basket of collateral) and FiRM (Fixed Rate Market) — a novel lending mechanism where borrowers use Dola Borrowing Rights (DBR) tokens to access fixed-rate DOLA loans, eliminating the variable rate uncertainty common in DeFi lending. Inverse Finance suffered two significant oracle manipulation exploits in 2022 ($15.6M and $1.2M), which led to major governance restructuring and the pivot to FiRM’s more security-hardened design.

DOLA Stablecoin

DOLA is Inverse Finance’s USD-pegged stablecoin:

Issuance mechanisms:

  • FiRM borrowing — users post collateral (ETH, wstETH, WBTC, cvxCRV, etc.) to borrow DOLA
  • AMM integration — DOLA circulates in Curve and Velodrome/Aerodrome pools, maintaining the peg through market depth
  • Fed mechanism — Inverse DAO can “print” or “contract” DOLA supply across different venues (called “Feds”) to manage peg stability

Peg maintenance:

  • The DOLA Fed expands supply into yielding protocols when DOLA trades above $1 (creating sell pressure)
  • The Fed contracts supply by repaying outstanding DOLA when it trades below $1 (creating buy pressure)
  • Curve pool depth provides liquidity to absorb temporary imbalances

FiRM: Fixed Rate Market

FiRM is Inverse Finance’s signature innovation:

DBR (DOLA Borrowing Rights)

DBR is a separate token that represents the right to borrow one DOLA for one year:

  • 1 DBR = the right to hold 1 DOLA borrowed for 1 year
  • Borrowers must hold sufficient DBR relative to their borrowed DOLA continuously
  • DBR depletes over time at a rate of 1 DBR per borrowed DOLA per year
  • If a borrower’s DBR balance is depleted, their position enters “deficit” mode and can be force-replenished (at a fee)

How Fixed Rate Works

  1. User acquires DBR tokens (via Velodrome/Curve market or INV staking rewards)
  2. User opens a FiRM position: posts collateral, borrows DOLA
  3. DBR depletes from their wallet continuously at (borrowed DOLA ÷ 365 days) per day
  4. The “cost” of the loan is the market purchase price of DBR — known at time of borrow
  5. Unlike Aave/Compound where rate can spike overnight, FiRM cost is fixed at DBR purchase price

Example: If DBR trades at $0.10 and a user buys 100 DBR, they can borrow 100 DOLA for 1 year for a known cost of $10 — a 10% annual rate known upfront.

INV Token

INV is Inverse Finance’s governance token:

  • Governance — INV holders govern protocol parameters, Fed policy, collateral additions, and DBR supply
  • Staking rewards — staked INV (sINV) distributes a share of protocol revenue
  • DBR issuance — INV stakers receive DBR as staking rewards, enabling long-term stakers to borrow DOLA at reduced effective cost

2022 Exploits and Restructuring

Inverse Finance suffered two oracle manipulation exploits:

  • April 2022 — $15.6M stolen via price manipulation of the INV/ETH Sushi LP oracle
  • June 2022 — $1.2M stolen via a similar oracle attack on DOLA market

Response:

  • Moved away from LP-based price oracles to Chainlink/Uniswap TWAP
  • Developed FiRM specifically to minimize oracle attack surface (personal collateral escrow model)
  • Implemented a debt repayment plan for affected users funded by DAO treasury

Sources

  1. Inverse Finance Documentation and FiRM Technical Overview — Inverse Finance Team, 2022–2023. Describes FiRM’s personal escrow collateral model, DBR token depletion mechanics for fixed-rate borrowing, DOLA Fed supply management, and INV staking for DBR rewards.
  1. “Inverse Finance Exploits: Oracle Manipulation Case Studies” — Rekt News / Chainalysis, 2022. Detailed post-mortems of both 2022 Inverse Finance exploits: attack vector analysis (LP-based oracle manipulation), flow of stolen funds, and Inverse Finance’s transparent response including user compensation plans.
  1. “Fixed-Rate DeFi Borrowing: DBR vs. Notional vs. Euler” — Messari Research, 2023. Compares fixed-rate DeFi lending mechanisms including Inverse Finance’s DBR pre-payment model, Notional Finance’s fixed-term bonds, Yield Protocol’s fixed-rate vaults, and Element Finance’s principal tokens — evaluating UX simplicity, rate predictability, and user adoption.
  1. “DOLA: Decentralized Stablecoin with Fed Mechanics” — Delphi Digital, 2023. Examines DOLA’s stablecoin design including Fed supply management mechanism, Curve pool depth, and how DOLA maintained its peg through the 2022 exploits despite significant protocol stress.
  1. Inverse Finance Governance Forum and Exploit Records — INV DAO, 2022–2023. Governance proposals covering exploit remediation, user compensation plan funding, FiRM launch decisions, DBR initial distribution, and collateral type additions to FiRM markets.

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