I Built the First DEX on BlockDAG Blockchain — Here's What I Learned

#blockchain #defi #solidity #webdev

I Built the First DEX on BlockDAG Blockchain

999DEX is live at https://999dex.com — the first native DEX on BlockDAG blockchain (Chain ID: 1404). 15 smart contracts deployed in 6 days.

Critical Gotcha: EVM Target

BlockDAG does not support the PUSH0 opcode (added in Ethereum Shanghai). Compiling with default settings silently breaks at deploy time.

Fix:

// hardhat.config.js
solidity: {
  version: "0.8.20",
  settings: {
    optimizer: { enabled: true, runs: 200 },
    evmVersion: "berlin"  // ← critical for BlockDAG
  }
}

Bonding Curve Math

Cost to buy N tokens from position S — exact, no rounding:

cost = N × BASE_PRICE + SLOPE × (S × N + N²/2)

36/36 unit tests passing.

Architecture

BondingCurve — fair launch phase, price discovery until 300k BDAG raised.

PoolFactory — post-graduation AMM, creates liquidity pool with raised BDAG.

FeeDistributor — automated fee split: 50% stakers / 30% treasury / 20% buyback-burn.

What We Built

Meme token launcher (bonding curve, fair launch)
AMM DEX with liquidity pools
Contract Studio — deploy ERC-20/NFT/DAO/Multisig/Staking/Vesting with zero code
Solidity IDE in-browser (compile + deploy)
$999 staking (earn 50% of platform fees)
DAO governance on-chain
35 pages, all live

Contract Addresses (BlockDAG Mainnet)

BondingCurve: 0x0b6A9622fdC63B2aB23494b79d8e1816E572969C
All 15 contracts: 999dex.com/ecosystem

Add BlockDAG to MetaMask

RPC: https://rpc.primordial.bdagscan.com | Chain ID: 1404 | Symbol: BDAG

999DEX is an independent community platform. Not affiliated with BlockDAG Network Labs.

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