# How We Built StableSwap Hooks for Revert Finance on Uniswap v4 > We built Curve-style StableSwap pricing as a Uniswap v4 hook for Revert Finance. Production-ready, multi-asset, and gas-efficient. Date: 2026-04-15T12:00:00-03:00 Author: Fernando Zavalía URL: https://blog.bootnode.dev/posts/stableswap-hooks-uniswap-v4 [Revert Finance](https://revert.finance/) came to us with a clear problem. Stablecoins and liquid staking tokens like USDC/USDT or wstETH/WETH trade near 1:1, but generic AMM pricing still charges unnecessary slippage on these swaps. [Curve Finance](https://curve.fi/) solved this years ago with StableSwap, a pricing algorithm built for correlated assets. But that math only existed inside Curve's ecosystem. If you wanted it, you had to leave [Uniswap](https://uniswap.org/). [Uniswap v4](https://docs.uniswap.org/contracts/v4/overview) changed the equation. Its new [hooks architecture](https://docs.uniswap.org/contracts/v4/concepts/hooks) lets developers attach custom logic to core AMM operations without forking the protocol. Revert brought us in to take advantage of that: build a production-ready hook that brings Curve-style StableSwap math into the Uniswap ecosystem. ## What We Built **Optimized stable asset trading.** Pools designed for assets that trade near 1:1, like USDC/USDT or [wstETH](https://lido.fi/)/WETH. The StableSwap pricing algorithm keeps slippage minimal even on large trades. In the high-volume, thin-margin world of stablecoins, that difference matters. **Multi-asset pools.** A single pool can hold two, three, or four assets at once. This avoids splitting liquidity across multiple pair pools, which typically means worse prices and more complexity for integrators. **Three-tier fee system.** LP fees, hook fees, and protocol fees, each tunable independently. Protocol teams get precise control over how value flows between liquidity providers, the hook operator, and the treasury. **Rate oracle support.** Assets like wstETH don't hold a fixed ratio to ETH. The exchange rate shifts as staking rewards accumulate. Our hook consumes real-time rate data and feeds it into the pricing math, so the invariant stays accurate as rates drift. **Fungible LP tokens.** Liquidity positions are standard [ERC-20](https://eips.ethereum.org/EIPS/eip-20) tokens, not NFTs. That makes LP shares transferable, composable with other DeFi protocols, and familiar to teams that have worked with earlier-generation AMMs. **Native ETH support.** Pools accept ETH directly. No wrapping to WETH before depositing or swapping, which cuts transaction steps and simplifies the experience. ## Engineering Challenges **Porting StableSwap math to [Solidity](https://soliditylang.org/).** The StableSwap invariant has no closed-form solution. Finding the correct output for a given input requires the Newton-Raphson method, applied iteratively until convergence. Solidity has no floating-point arithmetic, so every calculation runs in fixed-point integers where rounding errors compound across iterations. Getting this right meant careful precision management at every step while keeping gas costs practical for mainnet. **Handling assets that drift from 1:1.** Standard StableSwap assumes all pool assets are equal in value. Liquid staking tokens break that: wstETH is worth more than ETH, and the ratio grows continuously. We built a rate oracle system that injects the current exchange rate into the invariant calculation before every operation. The math always works on value-normalized quantities, not raw token amounts. **Deploying hooks to deterministic addresses.** Uniswap v4 has an unusual constraint: a hook's contract address must encode which hook functions it implements. The address itself acts as a capability bitmap. Generating a valid address requires [CREATE2](https://eips.ethereum.org/EIPS/eip-1014) with a specific salt, and finding that salt means iterating through candidates off-chain until the resulting address matches the required bit pattern. We built tooling to mine valid salts and deploy reliably. **Scaling across pool sizes.** Supporting two, three, and four assets in a single codebase means every core operation (swap routing, fee calculation, slippage checks, invariant evaluation) must generalize across a variable number of tokens. The math scales non-linearly: adding a third or fourth asset doesn't just add a term, it changes the shape of the problem. Each operation was designed and tested across all supported pool sizes. **Safe amplification coefficient ramping.** The amplification coefficient ("A") controls how tightly the pool prices assets near parity. Higher values mean less slippage at equilibrium but worse pricing at extremes. Changing A abruptly opens arbitrage windows. We implemented time-based ramping: the coefficient moves gradually from its current value to a new target over a configurable window, with safety bounds that prevent destabilizing an active pool. ## Tech Stack - **Built on:** [Solidity](https://soliditylang.org/) 0.8.30, [Uniswap v4](https://docs.uniswap.org/contracts/v4/overview) Core and Periphery, [OpenZeppelin](https://www.openzeppelin.com/) - **Tooling:** [Foundry](https://getfoundry.sh/) (Forge) - **Testing:** 290 tests across 16 suites, all passing - **Codebase:** roughly 1,400 lines of modular Solidity ## The Result Revert Finance now has a production-ready StableSwap implementation running inside Uniswap v4. No separate protocol, no fragmented liquidity. Protocols and users trading stable pairs get Curve-quality pricing without leaving the Uniswap ecosystem. The source code is open on GitHub: [revert-finance/stableswap-hooks](https://github.com/revert-finance/stableswap-hooks). If you need custom AMM infrastructure, DeFi protocol development, or deep Solidity engineering, [let's talk](https://www.bootnode.dev/#contact). ## BootNode [BootNode](https://www.bootnode.dev/) is a high-output engineering and product shop specializing in DeFi, staking, infrastructure, and interoperability. We help protocols and builders ship faster and scale with confidence. Explore other projects and get in touch [here](https://www.bootnode.dev/#caseStudies). ## Revert Finance [Revert Finance](https://revert.finance/) provides actionable analytics for liquidity providers in AMM protocols. Their tools help LPs understand and optimize their positions, making it easier to manage liquidity across decentralized exchanges. ## Uniswap v4 [Uniswap v4](https://uniswap.org/) is the latest version of the Uniswap Protocol. Its hooks architecture allows developers to attach custom logic to AMM pools, enabling new categories of on-chain trading infrastructure without forking the protocol.