AI completion, eco tier — the cheapest pay-per-call LLM (GPT-5-nano default; ?model=gpt-4.1-mini|gemini-flash|llama|deepseek). USDC per call, no API key, no signup. A loss-leader for high-volume agent work — bulk classification, extraction, tagging, short summaries — at a fraction of a cent. Step up to /v1/ai/ask for stronger models.