Chuang Ma

Built APIMaster.ai | Cheap != Cheat

About

I build tools for AI API transparency. Most recent: APIMaster.ai — behavioral fingerprinting to verify whether your LLM API provider is actually serving the model they claim. Built it after getting tired of not knowing if my "Claude Opus" was actually Opus. Open source, MIT. Cheap != Cheat.

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APIMaster.ai

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Maker History

APIMaster.aiDetect fake LLM APIs & reveal the real model underneath
Jun 2026

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Joined Product HuntJune 6th, 2025

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2mo ago

APIMaster.ai - Detect fake LLM APIs & reveal the real model underneath

The original idea was simple: I kept wondering – Is this LLM API I’m paying for actually real?? So I built something to answer that question. How does the detector work? I extracted 300+ stylistic features from each model (Opus 4.8 loves saying “genuinely”, “honestly”, and using “I” a lot, for example). Then built a classifier that can tell you what model is actually running behind the API. Based on 1k+ real user tests, 41% of LLM APIs out there are fake.