Securing AI APIs

Lesson 6 of 8 · 35 min · part of the AI Security Professional certification

Your AI endpoint is an API like any other — and a very expensive one. Every request consumes paid tokens and GPU time, so abuse translates directly into cost (Unbounded Consumption, OWASP LLM10) or denial of service.

Interactive exercise: Code review: a chat endpoint

• Authenticate and authorize every request; never expose provider keys to the browser.
• Rate limit and set quotas per user and per key; alert on spend anomalies.
• Cap input and output tokens server-side; allow-list models and parameters.
• Validate and log — keep audit logs of prompts, tool calls and outputs (with PII handling).
• Isolate tenants — one user's data must never appear in another user's context or cache.