Building a Zero-Cost DeFi Audit Pipeline: Slither + Foundry + AI in Under 30 Minutes

Professional smart contract audits cost $50K–$500K and take weeks. But 73% of exploited DeFi protocols in 2025-2026 had vulnerabilities that automated tools could have caught before deployment. Here's how to build a continuous audit pipeline that costs nothing, runs in your CI/CD, and catches the bugs that keep draining protocols. The Pipeline Architecture Source Code │ ▼ ┌─────────────┐ ┌──────────────┐ ┌────────────────┐ │ Slither │────▶│ Foundry │────▶│ AI Review │ │ Static Scan │ │ Fuzzing │ │ (Final Pass) │ └─────────────┘ └──────────────┘ └────────────────┘ │ │ │ ▼ ▼ ▼ Known Vuln State-Space Logic & Economic Patterns Exploration Attack Vectors Each layer catches what the others miss. Slither finds known patterns in seconds. Foundry fuzzing explores state space for hours. AI review catches the economic logic flaws that neither tool understands. Layer 1: Slither Static Analysis (5 Minutes to Set Up) Slither's 92+ detectors catch reentrancy, unchecked transfers, and access control i