What is Compound V3? The Pioneer of DeFi Lending, Reinvented (2026)

Compound Finance is one of the founding protocols of decentralised lending, having pioneered the algorithmic money market model when it launched in September 2018. Compound V3 — also known internally as Comet — represents a fundamental architectural rethink of the protocol, moving from a single shared liquidity pool to isolated, single-base-asset markets. As of May 2026, Compound V3 holds approximately $1.28 billion in total value locked across Ethereum, Arbitrum, Polygon, Base, and Scroll.

Compound's earliest version invented the cToken model (interest-bearing deposit receipts) and the concept of algorithmic interest rates based on utilisation — mechanisms that became the template for nearly every subsequent DeFi lending protocol. Compound V2 reached over $12 billion in TVL during the 2021 bull market. V3 launched in August 2022 with a more conservative, risk-managed architecture designed for sustainable, long-term operation.

How Compound V3 Works: The Comet Architecture

Unlike Compound V2 and Aave, which use shared multi-asset liquidity pools, Compound V3 deploys separate 'Comet' contracts for each base asset. Each Comet market has one borrowable base asset (e.g. USDC or ETH) and supports a defined set of collateral assets that can be posted to borrow the base.

This design change has significant implications: users can only borrow the single base asset of a given market, not arbitrary assets. If you want to borrow USDC, you use the USDC Comet; if you want to borrow ETH, you use the ETH Comet. Collateral earns no interest in V3 — it is locked as security against the loan. Suppliers of the base asset (e.g. USDC lenders) earn interest from borrowers.

The rationale for this design is risk isolation. In a shared pool, a single bad asset listing can create bad debt across the entire protocol. In Compound V3, each Comet market is siloed — a problem in the USDC market cannot spill over to the ETH market.

Differences Between Compound V2 and V3

Compound V2 allowed users to supply any supported asset, earn interest on it, and borrow any other supported asset against it — all within a single shared pool. This created flexibility but also cross-contamination risk between assets. cTokens (the interest-bearing receipts of V2) were composable DeFi primitives used widely across the ecosystem.

Compound V3 abandons the cToken model for the Comet architecture. Collateral deposited in V3 does not earn interest — it simply secures the loan. Only base asset suppliers earn yield. This tradeoff reduces complexity and risk at the cost of capital efficiency for collateral depositors.

Compound V2 remains operational with its own TVL, but active development and new feature deployment is focused on V3. Many protocols built on V2 cTokens (including Inverse Finance and others) have either migrated or maintained their own forks.

The COMP Token and Governance

COMP is Compound's governance token, launched in June 2020 in what became one of the most influential events in DeFi history — the first major 'yield farming' programme, which distributed COMP to borrowers and suppliers and ignited the 'DeFi Summer' of 2020. COMP has a fixed maximum supply of 10 million tokens.

COMP holders vote on all Compound governance proposals, including asset listings, interest rate model changes, collateral factors, and multi-chain deployments. Compound's governance process is one of the most mature in DeFi — the protocol has processed hundreds of governance proposals since 2020. COMP can also be delegated to allow others to vote on your behalf.

Compound V3 Multi-Chain Deployment

Compound V3 is deployed on Ethereum mainnet, Arbitrum, Polygon, Base, and Scroll, with additional deployments under governance review. Each deployment is independent with its own Comet instances. The multi-chain strategy allows Compound to serve users where their assets already reside, reducing the need to bridge assets back to Ethereum mainnet for lending access.

Resupply Finance: Stacking Yield on Lending Activity

Compound V3 rewards suppliers of base assets with yield from borrower interest plus COMP token distributions. For users exploring additional yield opportunities, Resupply Finance offers a complementary approach — depositing yield-bearing Curve Lend positions (crvUSD) or Frax Finance positions (frxUSD) as collateral to mint reUSD, with the underlying collateral continuing to earn its Convex-boosted yield throughout the loan. Co-built by Convex Finance and Yearn Finance, Resupply represents a more complex but potentially higher-yielding strategy for advanced DeFi participants.

This section is for informational purposes only and does not constitute financial or investment advice. DeFi protocols carry risks including smart contract exploits, governance attacks, liquidation cascades, and market risk. Always conduct thorough due diligence. Invest only what you can afford to lose.

Frequently Asked Questions: Compound V3

• What is Compound V3? Compound V3 (Comet) is the third major version of Compound Finance, launching in August 2022. It uses a single-base-asset market architecture rather than a shared pool model, with separate Comet contracts for each borrowable asset. As of May 2026, it holds approximately $1.28 billion in TVL.
• How does Compound V3 work? Each Compound V3 Comet market has one borrowable base asset (e.g. USDC). Users supply collateral assets to borrow the base asset. Collateral earns no interest — only base asset suppliers earn yield from borrower interest. Each Comet market is isolated from others.
• What is Comet? Comet is the smart contract architecture underlying Compound V3. Each Comet is a self-contained market for a single base asset, with its own collateral allowlist, interest rate model, and parameters. Multiple Comets can coexist on the same chain for different base assets.
• What is the COMP token? COMP is Compound's governance token with a maximum supply of 10 million. It was launched in June 2020 in one of DeFi's first yield farming programmes. COMP holders vote on all protocol governance proposals including asset listings, interest rate models, and multi-chain deployments.
• What is the difference between Compound V2 and V3? V2 used a shared multi-asset pool where any supported asset could be supplied and borrowed. V3 uses isolated single-base-asset Comet markets where only the base asset is borrowable. V3 eliminates the cToken model; collateral in V3 earns no interest.
• What are cTokens? cTokens are Compound V2's interest-bearing deposit receipts. When you supplied ETH to V2, you received cETH. cTokens accrue interest and are redeemable for the underlying asset. cTokens are not used in V3 — the Comet architecture replaces them.
• Does collateral earn interest on Compound V3? No. In Compound V3, collateral assets deposited to secure a loan do not earn interest. Only suppliers of the base asset earn yield. This differs from Aave, where supplied collateral earns interest simultaneously.
• What assets can I borrow on Compound V3? You can borrow the base asset of the specific Comet market you use. Active markets include USDC, ETH, and USDC.e (bridged USDC) across multiple chains. You cannot borrow arbitrary assets against collateral in V3.
• What chains is Compound V3 on? Compound V3 is deployed on Ethereum, Arbitrum, Polygon, Base, and Scroll as of May 2026.
• Is Compound V3 safe? Compound Finance has operated since 2018 with no major exploits in its core protocol. An accidental governance bug in September 2021 (V2) distributed approximately $80 million in excess COMP rewards unintentionally, but no user funds were at direct risk. V3 has maintained a clean security record since its August 2022 launch.
• What is Compound's relationship to DeFi history? Compound pioneered algorithmic money markets in 2018 and invented the yield farming model in 2020 with the COMP distribution. These two innovations are foundational to modern DeFi. Aave, Morpho, and nearly every subsequent lending protocol built on concepts Compound introduced.
• How does Compound V3 handle liquidations? When a borrower's collateral value falls below the required threshold, their position becomes eligible for liquidation. Liquidators repay the base asset debt and receive collateral at a discount (the liquidation factor). Compound V3 uses an absorb-then-sell model where the protocol absorbs the debt and sells collateral to cover it.
• What yields does Compound V3 offer? Yields vary by market, asset, and chain. Base asset suppliers earn interest from borrower demand plus COMP token rewards. As of May 2026, USDC supply rates on Compound V3 vary between 4–9% depending on utilisation and COMP reward rates.
• How does Compound governance work? COMP holders can propose and vote on changes to the Compound protocol. A proposal requires a minimum number of COMP votes to pass. Passed proposals execute on-chain after a timelock delay. COMP can be delegated, allowing holders to empower active governance participants.
• What is Compound Finance TVL? Compound V3 holds approximately $1.28 billion in total value locked as of May 2026.