The Same Prompt Twice Is Double Quota: A Verifiable Cache for Free Model Endpoints
Free model endpoints bill quota per token. Send the same prompt twice, and you pay twice. Retries protect you from failures. They do not protect you from duplicates. A cache layer does. This tutorial builds one from zero. Every stage ends with a verification step. No frameworks. No dependencies. One Node.js file. The problem CI jobs repeat prompts. Tests re-run the same summarization. Previews…
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