Just wrapped a full AMM DEX deployment on BNB Chain over at Fourchain. Here's exactly what the stack looked like end to end:
Smart Contracts: Solidity 0.8.20, Hardhat for development, Foundry for fuzz testing
Core contracts: Swap router, pair factory, liquidity pool, TWAP price oracle, Permit2 for single-transaction approvals, Multicall for batched RPC calls
Security: Slither + Mythril for automated scanning, full external audit, Immunefi bug bounty at launch
Frontend: Next.js, ethers.js, RainbowKit for wallet connections Monitoring: Tenderly for real-time contract alerts
Indexing: The Graph for on-chain event indexing
The part that surprised us most — Permit2 integration alone reduced user drop-off on first trade by a significant margin. Removing that second approval transaction matters more than most teams realize.
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