{
  "slug": "endpoint-liveness",
  "title": "Endpoint liveness",
  "hypotheses": [
    "H1",
    "H2",
    "H3",
    "H4",
    "H5"
  ],
  "status": "published",
  "release_date": "2026-04-09",
  "generated_at": "2026-04-21T11:44:55+00:00",
  "methodology_version": "0.2.0-draft",
  "commit_sha": "pending",
  "headline": "Full crawl of 2,974 distinct FHIR-REST hosts in the NDH: 93.3% answered HTTP, 85.4% served a parseable CapabilityStatement, 81.6% published valid SMART well-known, 90.3% answered an unauthenticated Practitioner?_count=1 with 200/401. Across the full NDH endpoint population: 5,043,524 endpoints total (74.2% FHIR-REST, 25.8% Direct Project); 98.7% of Organizations carry zero Endpoint references.",
  "numerator": 2539,
  "denominator": 2974,
  "chart": {
    "type": "bar",
    "unit": "percent",
    "data": [
      {
        "label": "L3 any HTTP",
        "value": 93.34
      },
      {
        "label": "L3 strict (200/30x/401)",
        "value": 62.44
      },
      {
        "label": "L4 CS parseable",
        "value": 85.37
      },
      {
        "label": "L5 CS conformant",
        "value": 85.37
      },
      {
        "label": "L6 SMART valid",
        "value": 81.57
      },
      {
        "label": "L7 unauth search",
        "value": 90.35
      }
    ]
  },
  "notes": "Probed 2,974 distinct FHIR-REST hosts (one endpoint per host, stratified by host). Crawl: 16 global concurrency, 1 rps per host, 10s connect / 30s read, exponential backoff on 429/503, User-Agent AINPI-DirectoryQualityBot/1.0. fhirVersion declared by L5-conformant hosts: {'4.0.1': 1599, '4.0.0': 938, '3.0.2': 1, '3.0.1': 1}. CapabilityStatement software top-5: {'Firely Server': 505, 'Epic': 456, 'Fhir Server': 282, 'Altera FHIR': 71, '1up FHIR Server': 42}. Highest level reached distribution: {7: 2687, 0: 33, -1: 136, 1: 23, 2: 28, 3: 39, 6: 14, 5: 14}. Certs expiring within 90 days of release: 271. H4 (connection type distribution) and H5 (orgs without endpoints) computed over the full population in BigQuery: H4 connection types: {'hl7-fhir-rest': 3741547, 'direct-project': 1301977}; H5 3,603,262 orgs of which 3,556,049 have no managingOrganization reference from any Endpoint."
}