OpenRouter

Four hands-on lessons take you from one API key and your first free-model call through switching models by a single parameter, comparing free vs paid, and building a cheap-first fallback while you watch your spend in the usage dashboard. OpenRouter gives you one OpenAI-compatible endpoint to reach hundreds of models — including many genuinely free ones (their ids end in `:free` and cost $0) — at pass-through provider pricing with no markup, so it drops straight in as the LLM backend for n8n, Hermes, and your own scripts.