LLMCap: A Proxy Service That Enforces Hard Spending Limits on LLM API Calls
By
cfaruk
Hot, fresh, and worth queueing round the block for.
Summary
LLMCap is a proxy service that enforces hard dollar caps on LLM API calls across major providers (Anthropic, OpenAI, Google Gemini, Mistral, Cohere). When a user's spending hits a preset limit (e.g., $50), the service returns a 429 error and stops the call entirely — not just an alert. It requires only a one-line code change (swapping the base URL) and adds less than 35ms latency. The service is positioned as a solution to prevent surprise AI bills for developers using LLM APIs.
Key quotes
· 5 pulledWhen you hit $50, it stops. Not an alert — it stops.
One line of code change. No surprise bills. Ever.
When you hit $50 → 429. Token never consumed.
Works with every major provider — Anthropic, OpenAI, Google Gemini, Mistral, Cohere
Setup in 5 minutes
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