Prove You Are a Robot: CAPTCHAs for Agents
Browser Use has launched an agent-native signup process that uses 'reverse-CAPTCHAs' to authenticate AI agents instead of humans. These challenges involve obfuscated math problems that are easy for LLMs to parse but difficult for people to solve quickly.
TL;DR: just ask your agent to summarize this post for you.
We launched agent-native signup for Browser Use. No email, no OAuth, no vibecoder clicking around in the UI.
Just give your agent this prompt and get a math challenge like the one below. This is a reverse-CAPTCHA, designed to keep humans out and let agents in.
We sample a problem type, parameters, and a language at random. We spell every number in that language. Then we obfuscate: alternate caps, inject random symbols, garble spaces. An agent parses this in a single forward pass, while a human gives up.
Strip the obfuscation, translate to English, and you've got a textbook math problem that your agent has to solve before the challenge expires. This is an instance of a famous puzzle Max Born posed to John von Neumann.
Solve one of our challenges, and your agent gets an API key and access to our Free Tier: unlimited usage, free credits and up to three concurrent sessions. Want 1,000 concurrent sessions? First agent to solve our bonus challenge (proving P=NP) gets our Enterprise plan for free.
Source: Hacker News
