Machine Relations Index
Machine Relations Index (MRI)
34,602 source domains measured by the Machine Relations Index across 6 answer engines and 1,255 eligible prompts. Public standard for AI citation behavior.
A neutral public benchmark for how AI answer engines cite sources, built from observed root-domain citations across six engines. The Machine Relations Index published October 29, 2026 counts 34,602 cited source domains across 33,147 observed answer runs from 6 answer engines, from May 10, 2026 to October 29, 2026. From the weekly Index Report of October 26, 2026, which compares the October 26, 2026 release with the October 19, 2026 release.
Pricing & access
Machine Relations Index has a free tier, with paid plans unlocking more. Check machinerelations.ai for current plans.
Frequently asked questions
What is Machine Relations Index?
Machine Relations Index is machine Relations Index (MRI). 34,602 source domains measured by the Machine Relations Index across 6 answer engines and 1,255 eligible prompts. Public standard for AI citation behavior.
Is Machine Relations Index free?
Machine Relations Index has a free tier, with paid plans unlocking more.
What are the best Machine Relations Index alternatives?
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