Head to head, rubric v2.3.0
Stance is 3 points more agent-ready than Merge4 (75/100 against 72/100). Both scores come from public HTTP responses only.
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Share of each check group passed
Machine access
Merge4 100%
Stance 100%
Content legibility
Merge4 81%
Stance 81%
Discovery surface
Merge4 65%
Stance 65%
Identity & policy
Merge4 17%
Stance 58%
Agent-facing performance
Merge4 100%
Stance 75%
Agent protocols
Merge4 40%
Stance 40%
Catalogue access
Merge4 100%
Stance 100%
Product data legibility
Merge4 90%
Stance 67%
Agent-commerce protocols
Merge4 20%
Stance 40%
Checkout traversability
Merge4 60%
Stance 73%
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