I Sniped a Solana Token in 400ms — Here's the Full Tech Stack When Solana's congestion was at its peak, I built a system that could snipe new token launches in under half a second. Here's the exact architecture, code, and painful lessons learned from running this in production. Why 400ms Matters Solana's block time is ~400ms. If your sniper isn't faster than this, you're already losing to MEV bots. My goal was to: Detect new pools on Raydium/Jupiter Construct the optimal swap route Submit as a Jito bundle before the next block The Stack That Made It Possible 1. Real-Time Data: Helius RPC Standard RPC endpoints couldn't keep up. Helius' WebSocket streams gave me: 3ms latency on programSubscribe for Raydium pool creations 8ms response times for getMultipleAccounts (vs 200ms+ on public RPCs) const heliusConnection = new Connection ( ' wss://mainnet.helius-rpc.com/?api-key=YOUR_KEY ' , { wsEndpoint : ' wss://mainnet.helius-rpc.com ' } ); // Listen for new Raydium pools heliusConnection .…