Developer builds LLM pricing API, finds AI agents are its most likely users

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A developer created LLM Price Watch, an API that aggregates and compares per-token pricing across major AI models including Claude, GPT, Gemini, DeepSeek, and Grok. Beyond standard pricing endpoints, a recommendation endpoint was added that suggests the best model for a given use case — such as coding assistance or document summarization — based on both cost and editorial analysis. The developer noted that AI agents performing runtime tool selection, not just human developers, emerged as a core audience for the API. Design decisions like open CORS and no API key requirement were made deliberately to reduce friction for agent-based callers. Pricing data was verified directly against each provider's official pages to avoid the lag common in third-party aggregators.

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