{
 "_about": "Published aggregate of spck.dev's independent read-only probe of the public UCP merchant population. Population frame: Hugging Face dataset UCPChecker/ucp-merchants (CC-BY-4.0), 2026-04-02 snapshot, status=verified (3,037 domains). Probe: GET /.well-known/ucp with an identified User-Agent, 2026-07-17. No individual merchant is named; aggregates only. Reproducible against the same public sources.",
 "scan_date": "2026-07-17",
 "population_source": "https://huggingface.co/datasets/UCPChecker/ucp-merchants/blob/ee420129b462cf109a571f7102084b282679dd1b/ucp-merchants-2026-04-02.csv",
 "population_license": "CC-BY-4.0",
 "domains_probed": 3037,
 "live_valid": 2974,
 "live_pct": 97.9,
 "version_2026_04_08": 2963,
 "version_2026_04_08_pct": 99.6,
 "version_dist": {
  "2026-04-08": 2963,
  "None": 6,
  "2026-01-23": 4,
  "2026-01-11": 1
 },
 "platform_hosted": 2955,
 "platform_hosted_pct": 99.4,
 "non_platform_endpoints": 11,
 "uniform_default_profile": 2955,
 "uniform_default_profile_pct": 99.4,
 "signing_keys_present": 11,
 "signing_keys_pct": 0.4,
 "cap_identity_linking": 4,
 "cap_buyer_consent": 4,
 "cap_ap2_mandate": 2,
 "capability_adoption": {
  "dev.ucp.shopping.checkout": 2967,
  "dev.ucp.shopping.fulfillment": 2965,
  "dev.ucp.shopping.order": 2964,
  "dev.ucp.shopping.discount": 2963,
  "dev.ucp.shopping.cart": 2963,
  "dev.ucp.shopping.catalog.search": 2958,
  "dev.ucp.shopping.catalog.lookup": 2958,
  "dev.shopify.catalog": 2955,
  "dev.ucp.shopping.buyer_consent": 4,
  "dev.ucp.common.identity_linking": 4,
  "dev.ucp.shopping.ap2_mandate": 2,
  "com.ucpchecker.domain_check": 1
 }
}