curl --request POST \
  --url https://api.iotools.cloud/v1/tool/web-vitals-score-calculator \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "lcp": "2000",
  "inp": "150",
  "cls": "0.05",
  "fcp": "",
  "ttfb": "",
  "tbt": ""
}
'

{
  "tool": "web-vitals-score-calculator",
  "tool_version": "1.0.1",
  "outputs": {
    "verdict": "Passes Core Web Vitals",
    "summary": "3 of 3 core metrics rated Good. A site passes Core Web Vitals only when LCP, INP, and CLS are all Good.",
    "metrics": [
      {
        "metric": "LCP — Largest Contentful Paint",
        "value": "2000 ms",
        "rating": "Good",
        "what-it-means": "Time until the largest visible element finishes rendering. Lower is faster perceived loading."
      },
      {
        "metric": "INP — Interaction to Next Paint",
        "value": "150 ms",
        "rating": "Good",
        "what-it-means": "Worst-case latency between a user interaction and the next visual update."
      },
      {
        "metric": "CLS — Cumulative Layout Shift",
        "value": "0.050",
        "rating": "Good",
        "what-it-means": "How much visible content unexpectedly shifts during page life. Lower is more stable."
      },
      {
        "metric": "FCP — First Contentful Paint",
        "value": "—",
        "rating": "Not Provided",
        "what-it-means": "Time until the first text/image is painted. Signals early visual feedback."
      },
      {
        "metric": "TTFB — Time to First Byte",
        "value": "—",
        "rating": "Not Provided",
        "what-it-means": "Server response latency: time from request to first byte received."
      },
      {
        "metric": "TBT — Total Blocking Time",
        "value": "—",
        "rating": "Not Provided",
        "what-it-means": "Total time the main thread was blocked (>50 ms tasks) between FCP and TTI in lab tests."
      }
    ],
    "suggestions": "No issues detected. Keep monitoring with real user data."
  },
  "credits_used": 3,
  "credits_remaining": null
}