The four free AI API sign-ups in order — Groq, Cloudflare Workers AI, NVIDIA build and Mistral — with each limit quoted, the catches, and one agent that falls through all four keys

The companion to the reel. Four companies hand you an AI API key for free with no card: Groq (free plan: 1,000 requests a day on gpt-oss-120b), Cloudflare Workers AI (10,000 Neurons a day on Workers Free), NVIDIA build (free tier, up to 40 requests a minute, no per-token billing) and Mistral (Free mode, on by default, no credit card required). PAGE 1 — what each company's own page says, quoted, with the four links. PAGE 2 — the four sign-ups in order, where each key lives, and the base URL and model name for each. PAGE 3 — the limits table and what they buy in practice, plus the five catches in the vendors' words (caps that reset, models that are not on the free lane, evaluation tiers, upgrade needs a payment method, keys are secrets). PAGE 4 — one agent starter in Python: a single OpenAI-compatible client that falls through the four keys on 429s, with the cron line and the three habits that keep it free. PAGE 5 — the bonus OpenRouter key, the proof checklist and honest notes. Facts verified September 15, 2026. Independent guide from Hyperautomation Labs — not affiliated with Groq, Cloudflare, NVIDIA, Mistral or OpenRouter.

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