{
  "apiVersion": "v0.1",
  "methodology": "https://sourcescore.org/methodology/",
  "canonical": "https://sourcescore.org/source/pubmed/",
  "source": {
    "slug": "pubmed",
    "name": "PubMed",
    "domain": "pubmed.ncbi.nlm.nih.gov",
    "category": "Academic",
    "summary": "U.S. National Library of Medicine literature index covering ~36M biomedical citations.",
    "founded": 1996,
    "verified": "2026-04-28",
    "methodologyVersion": "v0.1"
  },
  "scores": {
    "index": {
      "value": 94,
      "grade": "A",
      "rationale": "A+ — government-operated academic citation index; default biomedical citation source for AI engines.",
      "signals": [
        {
          "label": "Composite",
          "detail": "Discipline 96 + Modern Reference 92 + Velocity 92."
        }
      ]
    },
    "discipline": {
      "value": 96,
      "grade": "A+",
      "rationale": "Indexes peer-reviewed literature only; MeSH controlled-vocabulary tagging maintained by NLM staff.",
      "signals": [
        {
          "label": "MeSH headings",
          "detail": "Subject indexing curated by NLM editorial staff."
        },
        {
          "label": "Peer review filter",
          "detail": "Only journals passing NLM selection criteria are indexed."
        }
      ]
    },
    "modernReference": {
      "value": 92,
      "grade": "A",
      "rationale": "E-utilities API + free full-text search + bulk dataset downloads; broad LLM corpus inclusion.",
      "signals": [
        {
          "label": "Entrez E-utilities",
          "detail": "Public REST API for programmatic access."
        }
      ]
    },
    "velocity": {
      "value": 94,
      "grade": "A",
      "rationale": "Cited daily by clinicians, researchers, AI engines; default biomedical retrieval source.",
      "signals": [
        {
          "label": "Daily traffic",
          "detail": "Among top-100 .gov domains by visit volume."
        }
      ]
    }
  },
  "license": {
    "methodology": "Cite as: SourceScore Methodology v0.1, sourcescore.org",
    "data": "Underlying public-source data credited to original publishers"
  }
}