{
 "_about": "Published aggregate of spck.dev's independent read-only probe of the public UCP merchant population. Population frame: HuggingFace dataset UCPChecker/ucp-merchants (CC-BY-4.0), status=verified. Probe: GET /.well-known/ucp with an identified User-Agent. No individual merchant is named; aggregates only. Reproducible.",
 "scan_date": "2026-08-13",
 "population_source": "https://huggingface.co/datasets/UCPChecker/ucp-merchants/resolve/ee420129b462cf109a571f7102084b282679dd1b/ucp-merchants-2026-04-02.csv",
 "population_license": "CC-BY-4.0",
 "domains_probed": 3037,
 "live_valid": 2957,
 "live_pct": 97.4,
 "version_2026_04_08": 2951,
 "version_2026_04_08_pct": 99.8,
 "platform_hosted": 2942,
 "platform_hosted_pct": 99.5,
 "non_platform_endpoints": 15,
 "uniform_default_profile": 2942,
 "uniform_default_profile_pct": 99.5,
 "signing_keys_present": 0,
 "signing_keys_pct": 0.0,
 "cap_identity_linking": 4,
 "cap_buyer_consent": 4,
 "cap_ap2_mandate": 2
}