Built firewall for LLMs after prompt injection bypass GPT-4s guardrails

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After watching prompt injection attacks bypass every major LLM's safety systems, I built TrustLayer. It's a simple API that: 1. Scans prompts for injection attacks in real-time (heuristic + OpenAI moderation) 2. Detects when agents drift from their intended behavior 3. Has a kill switch for production incidents Built for production use. Free tier available. Open source docs and examples. The problem: Prompt injection is still breaking LLM apps in production. Most guardrails can be bypassed with simple tricks. The solution: API-first security layer that sits between your app and the LLM.

Visit product View on Hacker NewsJan 30, 2026

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