Building Custom Forta Detection Bots: How Real-Time Monitoring Could Have Saved $56M in March 2026 DeFi Exploits

Three major DeFi exploits hit in the first two weeks of March 2026: Venus Protocol ($3.7M oracle manipulation), Solv Protocol ($2.7M minting vulnerability), and a trader's $50M Aave slippage disaster amplified by MEV bots. Every single one exhibited on-chain warning signals minutes to hours before the actual drain. The difference between a protocol that loses millions and one that pauses in time? Real-time detection infrastructure. In this guide, I'll walk through building custom Forta detection bots that would have caught each of these exploits — with production-ready TypeScript code you can deploy today. Why Forta in 2026? Forta Network has matured into the de facto real-time monitoring layer for Web3. Over 50 DeFi protocols use it. The Forta Firewall now screens 100,000+ transactions daily across Celo, Gelato rollups, and more. But the real power isn't in Forta's off-the-shelf bots — it's in custom detection logic tailored to your protocol's specific risk surface. Here's what we're