Archimedes Dex

Archimedes is a DeFi app built to be better by fixing real friction: fewer transactions, less gas, and capital that works for you. Users can swap multiple tokens into a single asset in one on-chain transaction (basket swap) instead of one tx per token; an AI assistant (Claude) turns natural language into swap intents, pool lookups, and test-token minting so you don’t have to fight forms. When users invest in pools, allocated liquidity is put to work via LI.FI (cross-chain deploy and rebalance) and Yellow (off-chain session-based flows with on-chain settlement). We use Uniswap v4 and a custom hook (YieldOptimizerHook) on Base; the app also supports ENS (wallet names and “Send to” by name) and cross-chain quotes. The goal is a DeFi experience that’s clearer, cheaper, and more useful—measured in gas saved, prompts reduced, and liquidity actually earning.

We built Archimedes as a Next.js 15 app (React, Tailwind) with a Solidity backend. The frontend uses RainbowKit and wagmi to talk to Base Sepolia; the AI layer is Claude via the Vercel AI SDK in a Next.js API route (/api/agent) that parses natural language into structured intents (SWAP, BASKET_SWAP, FIND_POOLS, MINT_TEST_TOKENS) and returns JSON the UI consumes. Swaps go through Uniswap v4’s PoolManager using the Hookmate V4 Swap Router; we deploy our own YieldOptimizerHook on every pool so beforeSwap/afterSwap run on each leg. The “hacky” bit is the BasketSwapper contract: it’s a wrapper that holds no liquidity. The user approves it once per token; on basketSwap() we pull each input token, approve the router, then call the router’s swapExactTokensForTokens in a loop via low-level router.call(abi.encodeWithSignature(...)) so the router sees this contract as msg.sender. That gives one transaction for N swaps and one block confirmation, and the hook still fires for every leg. We use the LI.FI SDK for cross-chain quotes (in-app Cross-chain tab and /api/lifi/quote) and in the idle-liquidity-manager to get routes for rebalancing allocated liquidity across chains. Yellow is integrated for session-based off-chain flows (session create/end/balance API) so we can do instant quotes and micro-moves and settle on-chain when the session ends. ENS is wired with wagmi’s useEnsName/useEnsAddress so we show wallet names and resolve “Send to” by ENS. All pool keys, token addresses, and the path-finding logic live in the frontend (swap-path, quote, constants); the contract only receives precomputed SwapInput[] arrays. Deployed with Foundry scripts; mock tokens and pools on Base Sepolia for the demo