Curve Finance

Curve's stableswap invariant is optimized for trades between like-pegged assets (stablecoins, LSTs). It pioneered vote-escrow tokenomics where governance power is bought with locked CRV (veCRV).

Stableswap invariant gives minimal slippage on like-pegged trades; veCRV bribe markets (Convex/Votium) steer emissions.

- StableSwap AMM: Curve's core exchange invariant, combining a constant-sum and constant-product market maker so like-pegged assets (e.g. stablecoins, staked-ETH derivatives) trade with very low slippage near the peg. Introduced in Michael Egorov's 2019 StableSwap whitepaper. - Curve v2 (CryptoSwap / Tricrypto): A generalized invariant with internal price oracles that concentrates liquidity around a dynamically adjusted price, enabling low-slippage swaps between non-pegged, volatile assets (e.g. the Tricrypto USDT/WBTC/ETH pool). - CRV token & veCRV vote-escrow: CRV is the governance and emissions token. Locking CRV for up to 4 years mints non-transferable veCRV, which grants governance voting power, boosts LP rewards up to 2.5x, and earns a share of protocol fees. veCRV pioneered the 've-tokenomics' model widely copied across DeFi. - Gauge system & CRV emissions: Liquidity gauges measure LP participation; veCRV holders vote weekly to direct CRV emissions across gauges. This created a 'gauge/bribe economy' where protocols incentivize votes to attract liquidity to their pools. - crvUSD stablecoin: Curve's native overcollateralized USD stablecoin, deployed on Ethereum mainnet on 2023-05-03. Users mint crvUSD against collateral such as ETH, wstETH, WBTC, sfrxETH and tBTC. - LLAMMA (Lending-Liquidating AMM Algorithm): The liquidation engine behind crvUSD. Rather than liquidating collateral all at once, LLAMMA continuously converts collateral into crvUSD across price bands ('soft liquidation'), reducing the risk of abrupt, total liquidation.

- Curve DAO Token (CRV): Token, Governance token (vote-escrow via veCRV)

- Smart Contract: Curve contracts are written in Vyper. The July 30 2023 exploit showed that a bug in the Vyper compiler itself (versions 0.2.15/0.2.16/0.3.0) can silently break Curve's non-reentrant locks, allowing reentrancy drains of multiple pools even when the Curve source code appears correct. Compiler and low-level implementation risk is therefore a first-order concern. - Oracle: Curve v2 (CryptoSwap/Tricrypto) and crvUSD rely on internal EMA price oracles and aggregated stablecoin prices. Auditors (e.g. ChainSecurity) flagged that flash-loan-driven manipulation of pool totalSupply could distort the crvUSD price aggregator, so mispriced or manipulable oracle inputs can lead to bad mints or unfair liquidations. - Reserve / Depeg: crvUSD is only as sound as its collateral and the LLAMMA soft-liquidation engine. In fast, gapping markets soft-liquidation may fail to fully de-risk positions, leaving undercollateralized debt and creating depeg pressure on crvUSD. - Governance: Voting power concentrates in veCRV, and the emissions gauge system spawned a 'bribe economy' (the Curve Wars). Large veCRV holders and vote-buying markets can steer CRV emissions toward their own pools, and heavy founder/insider CRV holdings historically concentrated influence and market risk. - Systemic: CRV was widely used as loan collateral across DeFi (Aave, Fraxlend, Inverse, UwU, LlamaLend). The founder's large CRV-backed borrowing meant a CRV price drop threatened cascading liquidations across multiple protocols, and the June 2024 liquidation left real bad debt in lending markets - illustrating cross-protocol contagion risk tied to CRV.

- Money-market fund / FX spot desk for stable assets: similar in that Like an FX or money-market desk, Curve provides deep, low-slippage liquidity for swapping between closely-priced instruments (e.g. different USD stablecoins), earning a spread/fee on flow.; differs in that Curve is a non-custodial, permissionless smart-contract protocol with no market maker or intermediary; liquidity is pooled from users, pricing is algorithmic, and there is no KYC, settlement counterparty, or central operator.