{
  "kind": "fact",
  "studySlug": "citation-sources",
  "slug": "the-current-index-tracks-more-than-seven-hundred-thousand-cited-urls",
  "title": "The current index tracks more than 700,000 cited URLs",
  "description": "AI systems do not just cite domains. They return to a large but finite set of pages.",
  "lastUpdated": "2026-04-17",
  "lastTested": "2026-04-17",
  "sourceStudyUrl": "/trakkr-research/citation-sources",
  "sourceStudyTitle": "Where AI Gets Its Answers",
  "claimIds": [
    "citation-sources:unique-urls",
    "citation-sources:total-citations"
  ],
  "relatedSlugs": [
    "answer:how-big-is-the-competitive-set-for-ai-citations",
    "answer:what-source-categories-show-up-most-in-ai-answers",
    "tracker:top-cited-domain-tracker"
  ],
  "methodologySummary": "Built from the live citation index backing Trakkr Research, using 8,777,687 citations across 208,567 unique domains observed between October 3, 2025 and April 17, 2026.",
  "limitations": [
    "The live citation index is broader than the original December 2025 launch study, so percentages here should be read as the current benchmark.",
    "Domain share does not mean causal influence. It measures what models cited, not the full retrieval set.",
    "Category totals are domain-level rollups and may hide differences by model or query intent."
  ],
  "keywords": [
    "AI citations",
    "citation sources",
    "AI source preferences",
    "domain authority in AI"
  ],
  "schemaHints": {
    "pageType": "Article",
    "includeDataset": true
  },
  "claim": "Trakkr currently tracks 744,579 unique cited URLs in the public citation index.",
  "supportingMetrics": [
    {
      "label": "Unique cited URLs",
      "value": "744,579",
      "detail": "AI systems repeatedly converge on a relatively small URL set."
    },
    {
      "label": "Citations analyzed",
      "value": "8.78M",
      "detail": "Current live citation index as of April 17, 2026."
    }
  ],
  "whyItMatters": "Winning citations often means earning inclusion in a repeat-cited URL set, not just a domain-level presence.",
  "citationBlock": {
    "quote": "Trakkr currently tracks 744,579 unique cited URLs in the public citation index.",
    "attribution": "Where AI Gets Its Answers - Trakkr Research",
    "url": "https://trakkr.ai/trakkr-research/citation-sources/facts/the-current-index-tracks-more-than-seven-hundred-thousand-cited-urls"
  }
}