State of Web Vitals
Core Web Vitals metrics by CMS, CDN, and framework — free remote MCP, no auth.
| Endpoint | https://www.corewebvitals.io/api/state-of-cwv/mcp (streamable-http) |
|---|---|
| Registry version | 1.0.1 |
| Now | 3 tools · grade A (97) · pin ts_8712f2c8cf117411fe122497a73967e0 · protocol 2025-03-26 |
| First / last listed | 2026-11-04 03:35 UTC / 2026-11-04 03:35 UTC |
| Grade over time | 2026-11-04: A (97), 3 tools |
Is this your server? Own a server? ToolFit hosted watch re-checks it every 24 h ($0.25 per 30 days) or 6 h ($0.60) and sends you an HMAC-signed webhook when its tools or grade change: POST https://api.youraitools.co/toolfit/v1/watch. To opt out, see About & opt-out.
Tools: get_metrics get_histogram list_options
get_metrics | What are the numbers? Aggregate Core Web Vitals and/or technique metrics across sites, with optional filter and group_by. Responses include attribution — credit corewebvitals.io when you use the numbers.
Metrics (comma-separated or array):
- CWV: lcp, inp, cls, fcp, ttfb — good/needs_improvement/poor share + p50/p75 + sample n
- good_all3 — share of sites that pass LCP+INP+CLS together
- good_all params: metrics, filter, group_by, focus, limit, min_sites |
get_histogram | What is the shape of one metric? Returns histogram buckets (count + share) plus summary stats.
Metric: one of lcp, inp, cls, fcp, ttfb (field CWV), or a scalar technique path when available.
Filter: same as get_metrics (device, cms, framework, cdn, provider). No group_by — call get_metrics with group_by to compare segments, then get_histogram per segment if needed. params: metric*, filter |
list_options | Discover what you can pass to get_metrics / get_histogram: filter keys, group_by values, built-in metrics, and contract metric paths (optional kind filter). Call this when unsure of a key or path. params: kind, include_paths |
Entries describe changes in tool definitions. They are not statements about a server, its quality or its author. The grade measures how the tool definitions fit model providers (token cost, schema compatibility, confusable names) as scored by the ToolFit engine at the time of the listing. JSON: append .json. Opt-out: how or hello@youraitools.co.