Turns a passive limit order into a yield-bearing position and compensates the user for impermanent loss out of the yield it earns. Submitted to the UHI9 Hookathon (Impermanent Loss & Yield theme), live on Unichain mainnet.

• Oracle-free IL rebate — impermanent loss derived from sqrtPriceX96 deltas via a 2nd-order Taylor approximation; rebate = min(yield, IL). No external price feeds.
• Yield routing — executed output is deposited into an ERC-4626 vault until claim.
• Orders as NFTs — every order is an ERC-721: composable and tradable on secondary markets.
• O(1) tick scanning — doubly-linked list of active ticks only; swap cost scales with populated ticks crossed, not range width.
• Anti-DoS execution — failed orders don't revert the swap: they emit and re-queue, with gas metering to avoid OOG.
• Flash accounting — atomic settlement via Uniswap V4 native accounting, no ERC-20 transfer overhead.

Stack: Solidity 0.8.26 · Uniswap V4 · OpenZeppelin (ERC-721 / ERC-4626) · Foundry · Next.js · wagmi v2 · viem · RainbowKit

Deployed: hook on Unichain → 0x8C19…d4CE

Production limit orders for Uniswap V4 with automated, gas-bounded execution triggered directly inside swaps. Live on Base and Unichain mainnet.

• Self-executing — orders fill in the afterSwap hook as the pool crosses their tick. No keepers, no relayers.
• O(1) tick buckets — doubly-linked list of populated ticks for constant-time lookup during execution.
• Anti-DoS, graceful execution — a failing order never bricks the swap path.
• Bounded gas — 5 BPS execution fee, gas-metered batch execution, 150k gas cutoff per swap.
• Audit-ready — documented scope and invariants for external review: AUDIT_SCOPE.md.

Stack: Solidity 0.8.26 · Uniswap V4 · Foundry · Next.js · wagmi v2 · RainbowKit

• Fully on-chain — execution lives in the contract, not in a bot. If it needs a keeper or a relayer to work, it isn't done.
• Gas as a hard constraint — bounded, metered execution paths; no unbounded loops on the swap hot path.
• Anti-DoS by design — one failing order must never brick the pool for everyone else.
• Test-first — full Foundry suites covering unit, integration, and adversarial paths before anything ships.
• Mainnet or it didn't happen — deployed, verifiable, with a live frontend.

• Contracts — Solidity · Foundry · Uniswap V4 · OpenZeppelin (ERC-721 / ERC-4626)
• Frontend — Next.js · TypeScript · wagmi v2 · viem · RainbowKit
• Chains — Base · Unichain · Arbitrum (upcoming)
• Ops — Gnosis Safe 2-of-3 · Vercel · GitHub Actions · Foundry CI

• 🌐 Portfolio — impetus82.github.io
• 💬 Telegram — @yurka_e
• ✉️ Email — egoshin_crypto@proton.me