YC F26's GrayPass Uses Behavioral Biometrics to Tell Humans from AI, Hits $50K MRR
ycombinator · x · 2026-10-29
GrayPass (YC F26) launches continuous control verification: login proves who entered, but before a sensitive action like moving money or exporting customer data, GrayPass checks whether the expected person is still in control — human or AI agent.
Key details:
- Builds a "Brainprint" from pointer movement, keystroke timing, and scroll cadence — interaction style, not typed content
- Returns enforceable decisions (allow / verify again / hold / deny) bound to the exact action, layering on top of existing IdPs, passkeys, and MFA
- Founders report 900K+ sessions processed and $50K revenue this month, backed by YC and angels
As agents start operating software on users' behalf, the gap between "valid session" and "current control" is a real security problem — this product is an early, revenue-generating answer.
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