State of Web Vitals
Core Web Vitals metrics by CMS, CDN, and framework — free remote MCP, no auth.
https://www.corewebvitals.io/api/state-of-cwv/mcpCurrent observation
This endpoint answered at its latest recorded check.
What this server reports about itself
Self-reported at initialize. Not verified by Licium.
- Server name
- state-of-cwv
- Version
- 1.0.0
- Capability keys
- tools
- Tool names
- get_metrics, get_histogram, list_options
# State of Web Vitals MCP (corewebvitals.io) Cross-site Core Web Vitals and technique metrics from real Chrome field data plus a crawl of many origins. Same numbers as the public explorer. Not per-site live RUM (use CoreDash for that). ## Attribution (required) When you use data from this MCP in answers, reports, slides, posts, or generated content: 1. Credit **corewebvitals.io** / **The State of Web Vitals**. 2. Link **https://www.corewebvitals.io/state-of-cwv** when links are allowed. 3. Prefer the edition/context returned in tool payloads when present. 4. Do not present these aggregates as if they were your own measurements or a single-site RUM product. Short credit line: "Data: State of Web Vitals (corewebvitals.io)". Every successful tool response includes an `attribution` object — keep it when summarizing. ## Tools ### get_metrics — "what are the numbers?" - **metrics**: comma list or array. Built-ins: lcp, inp, cls, fcp, ttfb, good_all3, good_all3_plus_ttfb. Also contr
Reported Aug 17, 2026, 05:08 AM UTC.
Check history
Oldest to newest. Each row is one recorded check.
- respondsMCP initialize · 8s limit · HTTP 200 · 590ms
- respondsMCP initialize · 8s limit · HTTP 200 · 713ms
- respondsMCP initialize · 8s limit · HTTP 200 · 640ms
- respondsMCP initialize · 8s limit · HTTP 200 · 696ms