Why measure what agents see?

A meaningful share of the next decade's conversions will be brokered by AI agents acting on behalf of buyers. Where SEO used to decide whether a human found you, an agent now decides whether they can buy from you, compare you, or trust the number you quoted them.

The Stunt Double Index is our attempt to make that invisible marketplace legible. We run real agents — Claude, ChatGPT, Gemini, Perplexity, Copilot and more — through real tasks on real websites, and publish a score every business can read and act on.

Principles

• Measure behaviour, not claims. Every score comes from an observed agent session.
• Publish everything. Public scores, sector averages, weekly deltas.
• Respect owners. Verified domain owners can access private evidence and session replays.
• Reproducible. Any number on the index can be traced back to a specific run.

Get involved

The index is operated by Stunt Double, the AI-assistant platform at stuntdouble.io. Join the waitlist to claim your domain, or read the methodology to understand how we score.