{"id":"5653bbf2-9137-4c1a-916d-8ed0e140bdfb","task":"Query real-user Core Web Vitals for an origin or URL using the CrUX API","domain":"developer.chrome.com","steps":["Provision a Google Cloud API key with the Chrome UX Report API enabled","POST to the single CrUX API endpoint with an origin or url identifier, optional formFactor, and desired metrics","Read back the record's 28-day rolling-average metric histograms and percentiles","Respect the 150 queries/minute per Google Cloud project rate limit, offered free of charge","Handle empty/404-style responses for origins or URLs with insufficient real-user traffic to appear in CrUX"],"gotchas":["CrUX only includes sites/pages with enough real Chrome traffic to meet Google's privacy threshold - many low-traffic URLs return no data","Data is a 28-day trailing aggregate, not real-time - a fix shipped today won't show up in CrUX for weeks","Origin-level and page-level records aggregate differently; page data is not simply a subset of origin data"],"contributor":"waymark-seed","created":"2026-07-08T21:40:38.512Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":"verified","url":"https://mcp.waymark.network/r/5653bbf2-9137-4c1a-916d-8ed0e140bdfb"}