Limit Order Book

Off-chain limit order system with on-chain settlement. Gasless EIP-712 signed orders, keeper-executed fills, GTC and FOK support.

Product 9 of the defi-router store. Part of the CryptoForge DeFi toolkit.

Price: $14.99 | License: MIT | Solidity: ^0.8.24 | Framework: Foundry

Overview

LimitOrderSettlement is a production-ready limit order settlement contract that enables gasless off-chain order creation with on-chain execution. Users sign EIP-712 typed limit orders; a keeper/relayer monitors market prices and batch-fills orders when conditions are met.

Key Features

• Gasless order creation -- Makers sign EIP-712 orders off-chain (zero gas cost)
• On-chain settlement -- Keepers execute fills via the settlement contract
• GTC orders -- Good Till Cancelled with partial fill support
• FOK orders -- Fill Or Kill, all-or-nothing execution
• Batch fills -- Fill multiple orders in a single transaction
• Configurable fees -- Protocol fee (0-1%) on each fill, sent to fee recipient
• Nonce-based cancellation -- Cancel individual orders or all orders at once
• Permit2 ready -- Immutable Permit2 address for gasless approval flows
• Emergency controls -- Pause fills + sweep stuck tokens
• Ownable2Step -- Two-step ownership transfer