Building a Gas-Optimized On-Chain Order Book DEX

Описание: In this video, we're building a fully on-chain order book DEX in Solidity from scratch with a serious focus on gas optimization. Most DEX tutorials show you AMMs like Uniswap, but real traders want limit orders and FIFO matching. Doing this on-chain has a reputation for being expensive. We're going to fix that.

You'll learn how to design a price-bucketed order book that uses linked lists for FIFO ordering within each price level, achieving O(1) matching at the top of book. We'll pack our Order and PriceLevel structs into single storage slots to slash SSTORE costs, use bitwise tricks to eliminate branching, and implement lazy deletion to recover gas on filled orders.

What you'll walk away with:

A complete OrderBookDEX contract under 250 lines of Solidity
A deep understanding of struct packing and why it matters
The price-bucketed FIFO pattern used by serious on-chain DEXs
How to manage sorted price levels with a linked list
Token settlement flows for buy and sell sides
Cancellation logic that maintains the book's integrity

This tutorial assumes you're comfortable with intermediate Solidity. If you've written an ERC-20 and used mappings, you're ready. By the end, you'll understand why gas optimization is mostly about thinking in storage slots.

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Tags: solidity tutorial, on chain order book, dex development, gas optimization solidity, smart contract development, ethereum development, defi development, solidity gas optimization, struct packing solidity, order book exchange, decentralized exchange tutorial, web3 development, foundry tutorial, advanced solidity, ethereum smart contracts, dex tutorial, limit order book, fifo matching engine, evm optimization, web3 tutorial, blockchain development, solidity 0.8, ethereum dapp, smart contract security

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