SDThe Stunt Double Index
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What we measure

The index is a weighted composite of eight categories — each independently scored across every tracked agent provider. Weights reflect how directly a category affects conversion.

Weight 10%
Brand awareness
Can agents recognise you exist?

Measures how often and how accurately leading agents mention your brand in unprompted research and comparison tasks.

Weight 15%
Discovery
Will they pick you?

How well agents discover, shortlist and recommend your product when a user asks for a solution in your category.

Weight 15%
Information retrieval
Can they read your site?

Quality of structured data, semantics and navigability for agents extracting pricing, specs and policies.

Weight 15%
Market ranking
Where do you sit in the lineup?

Your relative placement vs. competitors when agents produce ranked lists for buyers in your market.

Weight 15%
Accuracy
Do they tell the truth about you?

How often agents report correct pricing, features, availability and policies — and how often they hallucinate.

Weight 15%
Checkout
Can an agent complete a purchase?

End-to-end completion rate for agentic checkout across guest, logged-in and delegated-access flows.

Weight 10%
Delegated access
Do you let agents in, safely?

Availability of scoped auth (OIDC, API keys, MCP), rate limits, and tooling for delegated agent sessions.

Weight 5%
Support & returns
Can an agent resolve an issue?

Completion rate and clarity when agents attempt to get help, cancel, return, or manage a subscription.

The Stunt Double Index

Measuring how real AI agents experience the world's websites — so businesses can stop being invisible to the next generation of buyers.

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