Captcha proves you're human. HATCHA proves you're not

HATCHA is a reverse CAPTCHA library from monday.com that gates access to AI agents by presenting challenges humans find tedious but LLMs solve trivially: 5-digit multiplication, 60-80 character string reversal, binary-to-ASCII decoding, and sorting. Verification is stateless using HMAC-signed tokens with hashed answers, requiring no database. Ships with Next.js App Router and Express adapters via npm.