feat: add Rubicon Aquila V2 (constant-product AMM, 4 chains)

[bghughes]

Summary

Adds Rubicon Aquila V2 — Rubicon Finance's UniswapV2-fork constant-product AMM — as a routable liquidity source via the existing generic UniswapV2 adapter. Aquila is deployed on Ethereum, Optimism, Arbitrum, and Base.

Scope

Config-only on the adapter side. The UniswapV2 class in this repo is parameterized over UniswapV2Config and auto-registers every key via getDexKeysWithNetwork/_.omit. Adding Aquila is a new top-level entry in that map. No new directory, no new class, no math.

Files changed (5 files, +109 / -0)

• src/dex/uniswap-v2/config.ts — one new entry, RubiconAquila, covering all four chains.
• src/dex/uniswap-v2/uniswap-v2-e2e-mainnet.test.ts — one minimal describe('RubiconAquila', ...) block with a single SELL test (WETH → USDC).
• src/dex/uniswap-v2/uniswap-v2-e2e-optimism.test.ts — same shape, single SELL test (USDC → DAI — Aquila Optimism has no native WETH/USDC pair).
• src/dex/uniswap-v2/uniswap-v2-e2e-arbitrum.test.ts — single SELL test (WETH → USDC).
• src/dex/uniswap-v2/uniswap-v2-e2e-base.test.ts — single SELL test via the file's testForNetwork() helper (WETH/USDC).

Configuration

Chain	Factory	Init code hash	feeCode
Ethereum	0x7bad585c3ae4ae266f92a4af13b388bc7b26067c	0x79cb29831f0abd24ae48de6fa5dc9eb647f10df38618ed09b70b2044d35dfba5	30
Optimism	0x3B2C6fe3039B42f00E98b76531C05932abfB258e	same	30
Arbitrum	0xEca3EA559b7566e610d113bbA8D1B15B085C9c68	same	30
Base	0xA5cA8Ba2e3017E9aF3Bd9EDa69e9E8C263Abf6cD	same	30

Verification

• Pair swap() ABI — byte-identical to UniswapV2 (IAquilaPair.sol:70-75).
• getReserves() shape — standard UniV2 (uint112, uint112, uint32) confirmed on-chain.
• Init code hash — sourced from RubiconDeFi/aquila → AquilaLibrary.sol:35; verified on-chain by computing pairFor(USDC.e, OP) and matching factory.allPairs(0) on Optimism.
• Fee — 997/1000 numerator from AquilaLibrary.sol:82 → feeCode: 30 (standard UniV2).
• Cross-validation — the Aquila Base factory 0xA5cA8Ba2e3017E9aF3Bd9EDa69e9E8C263Abf6cD is the same address DefiLlama/DefiLlama-Adapters already indexes at projects/rubicon/index.js.

Local checks

pretty-quick, tsc, and eslint all pass (run via the repo's prepare script during pnpm install and again via the pre-commit hook). Existing uniswap-v2-integration.test.ts continues to pass on the 2 RPC-only cases (getTopPoolsForToken requires API_KEY_THE_GRAPH which we don't set locally — affects all UniswapV2 forks equally, not specific to this change).

Links

• Rubicon Finance: https://rubicon.finance
• Docs / integrations page: https://docs.rubicon.finance/integrations
• Deployments page: https://docs.rubicon.finance/developers/deployments
• Aquila contracts: https://github.com/RubiconDeFi/aquila

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Note

Low Risk
Low risk: config-only addition of a new UniswapV2-fork entry plus new e2e tests; main risk is incorrect factoryAddress/initCode values causing routing or quoting failures on the listed networks.

Overview
Adds RubiconAquila to UniswapV2Config, wiring in factory addresses + init code hash (and standard feeCode/gas estimates) for Mainnet, Optimism, Arbitrum, and Base so the existing UniswapV2 adapter can route against Aquila.

Extends UniswapV2 e2e suites on those networks with minimal RubiconAquila swap tests (e.g., WETH→USDC on Mainnet/Arbitrum/Base, USDC→DAI on Optimism) to validate integration.

^{Reviewed by Cursor Bugbot for commit 1ed2fe3. Bugbot is set up for automated code reviews on this repo. Configure here.}

[bghughes]

Hi @0xNazarii @KanievskyiDanylo 👋 — friendly bump on this one. It adds Rubicon's Aquila V2 (constant-product AMM) across 4 chains; CI (Cursor Bugbot) is green and there are no open comments. Companion to #1183 (our CLMM PR). Happy to rebase or address anything whenever you get a chance — thanks!