LimitCraft

⛓️ The Problem: Traditional limit orders rid lenders and traders of yield-earning opportunities by forcing them to wait for price targets. Capital sits idle, creating opportunity cost.

🚀 Our Solution: LimitCraft revolutionizes limit orders by integrating lending protocols directly into the order execution flow and also offers TWAP.

Key Innovations:

🪙 Auto Asset Unwrap

• Automatically withdraw maker tokens from AAVE just before your limit order fills
• No idle capital - your assets earn yield while orders are pending

⚡ Instant Yield Deployment

• Received tokens are instantly deposited into lending markets right after order execution
• Seamless transition from one yield-earning position to another at a favorable trade rate

📊 TWAP Execution

• Fill large orders gradually over customizable time intervals
• Reduces market impact while maintaining capital efficiency
• Each sub-order maintains the lending integration

🔐 Gasless Experience

• Permit2 integration eliminates repeated approval transactions
• Sign once, trade efficiently across multiple orders

Technical Advantages:

• Non-custodial: Built entirely on 1inch Limit Order Protocol extensions
• Gas Optimized: Batched interactions reduce transaction costs
• Mobile Responsive: Modern React UI with real-time order tracking

LimitCraft pushes the 1inch Limit Order Protocol to its limits, implementing sophisticated capital efficiency features through smart contract extensions:

🏗️ Smart Contract Architecture

Core Extensions (Solidity + Foundry):

• InteractionManager.sol - Orchestrates lending protocol interactions
• TwapCalculator.sol - Handles time-weighted order calculations
• Custom extension system integrating AAVE V3 lending pools

🔄 Advanced Order Mechanics

PreInteraction - Executed before order fills:

• Detects if maker asset is in AAVE lending position
• Automatically withdraws exact amount needed for the trade
• Supports both regular and TWAP order types

PostInteraction - Executed after order fills:

• Instantly supplies received tokens to AAVE lending pools
• Maintains capital efficiency throughout the trade lifecycle

TWAP Implementation:

• Uses getMakingAmount() and getTakingAmount() callbacks
• Custom time-based calculation with Chainlink price feeds
• Supports 1-168 hour execution windows with configurable intervals

⚡ Frontend Innovation

Modern React Stack:

• TypeScript + Vite for fast development
• Wagmi v2 + RainbowKit for Web3 integration
• shadcn/ui components for polished UX
• Real-time order status tracking with WebSocket connections

1inch API Integration:

• Balance API for live wallet data
• Token API for metadata resolution
• Price API for market rate calculations
• Permit2 signatures for gasless approvals

🛠️ Backend Infrastructure

High-Performance Stack:

• Bun + Elysia.js - Ultra-fast TypeScript runtime (3x faster than Node.js)
• PostgreSQL + Drizzle ORM - Type-safe database operations
• Automated Resolver Service - Monitors and executes orders using 1inch APIs

System Components:

├── contracts/     - Solidity extensions + Foundry tests
├── api/          - REST API with order management
├── db/           - Database schema + migrations
├── resolver/     - Background order execution service
└── ui/           - React frontend with Web3 integration

🔐 Security & UX Features

• EIP-712 Signatures - Industry standard order signing
• Permit2 Integration - Eliminates repeated approvals (gas savings ~60%)
• Mobile Responsive - Works seamlessly across all devices

🎯 Hackathon Achievements

• First-ever limit order platform with integrated lending yield
• Sub-second order matching and execution
• Production-ready architecture with horizontal scaling support
• Intuitive UX - Complex DeFi interactions simplified into one-click actions