What a Binance CAPTCHA solver tells us about today's bot threats

Author here. A few weeks ago, someone posted a link on Reddit to an open-source CAPTCHA solver made for Binance’s slider challenge. It’s written in Python and works without using a browser. Just a custom HTTP client, some image matching, and basic reverse engineering.

I was curious and decided to dig into it. I wrote a long breakdown of how it works, how it solves the challenge, and what this says about how bots are built today. Many bots use headless browsers, but this one doesn’t, and it still gets through.

One of the main takeaways is how effective this kind of non-browser approach can be when CAPTCHA is deployed in isolation, without other layers like continuous behavioral checks.

Happy to discuss or answer questions.