Website Page Speed Test & Core Web Vitals

omnial/x402-page-speed-test

Given a page URL and a mobile or desktop testing strategy, returns a 0-100 performance score, a letter grade, Core Web Vitals timing metrics (Largest Contentful Paint, First Contentful Paint, Cumulative Layout Shift, Total Blocking Time, Time to First Byte, Speed Index), and a prioritized list of optimization opportunities and diagnostics for speeding up the page.

activeper callv2

Price

Up to $0.0811 per call; you pay what the call used

You pay the price shown. If a call turns out to cost more than its quote, you pay the actual price, capped at twice the quote. No monthly minimum. Top-ups start at $5.00.

Data source

Google PageSpeed Insights

Data from Google PageSpeed Insights.

Use it

Your AI assistant does the work: it finds this tool, shows you the price first, runs it, and you are charged when the run finishes. There is nothing to set up for this tool in particular.

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For developers: the calls your assistant makes

agent

// 1. search: find the tool
omnial_search({ query: "what you need" })

// 2. inspect: price and input schema
omnial_inspect({ tool: "omnial/x402-page-speed-test" })

// 3. learn: read the usage guide at runtime
omnial_learn({ tool: "omnial/x402-page-speed-test" })

// 4. run: price the exact call first, then run it
omnial_execute({ tool: "omnial/x402-page-speed-test", input: { /* see input_schema */ }, dry_run: true })
omnial_execute({ tool: "omnial/x402-page-speed-test", input: { /* ... */ } })

// 5. settle: the call is charged when it finishes, nothing to do

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Pricing

Every charge this tool can incur.

Charge	Price
Per call	$0.0811

Updated: Oct 27, 2026

Input and output schemas

Input schema

input_schema.json

{
  "type": "object",
  "required": [
    "url"
  ],
  "properties": {
    "url": {
      "type": "string"
    },
    "strategy": {
      "type": "string",
      "description": "mobile or desktop (default: mobile)"
    }
  },
  "additionalProperties": false
}

Output schema

output_schema.json

{
  "type": "object",
  "properties": {
    "grade": {
      "type": "string",
      "description": "A letter grade derived from performance_score, e.g. 'C' at 54, 'A' at 100."
    },
    "metrics": {
      "type": "object",
      "properties": {
        "fcp_ms": {
          "type": "number",
          "description": "First Contentful Paint, in milliseconds."
        },
        "lcp_ms": {
          "type": "number",
          "description": "Largest Contentful Paint, in milliseconds."
        },
        "tbt_ms": {
          "type": "number",
          "description": "Total Blocking Time, in milliseconds."
        },
        "ttfb_ms": {
          "type": "number",
          "description": "Time to First Byte, in milliseconds."
        },
        "cls_score": {
          "type": "number",
          "description": "Cumulative Layout Shift score (unitless, typically 0 to low single digits). Observed 0 and 0.001."
        },
        "speed_index": {
          "type": "number",
          "description": "Speed Index score, in milliseconds."
        }
      },
      "description": "Core Web Vitals and related timing metrics, all in milliseconds unless noted.",
      "additionalProperties": true
    },
    "strategy": {
      "type": "string",
      "description": "The testing strategy actually used, e.g. 'mobile' or 'desktop', echoed back."
    },
    "diagnostics": {
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "title": {
            "type": "string"
          },
          "description": {
            "type": "string"
          },
          "displayValue": {
            "type": "string",
            "description": "A short human-readable summary value, e.g. '2.1 s' or 'Est savings of 12 KiB'."
          }
        },
        "additionalProperties": true
      },
      "description": "Additional diagnostic findings without a direct time-savings estimate. Observed empty on a page that already scored 100 (wikipedia.org desktop) -- an empty array means no diagnostics were found, not an error."
    },
    "opportunities": {
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "title": {
            "type": "string"
          },
          "savings_ms": {
            "type": "number",
            "description": "Estimated milliseconds saved if addressed."
          },
          "description": {
            "type": "string"
          }
        },
        "additionalProperties": true
      },
      "description": "Prioritized suggestions with an estimated time savings. Observed empty on a page that already scored 100 (wikipedia.org desktop) -- an empty array means no opportunities were found, not an error."
    },
    "performance_score": {
      "type": "number",
      "description": "Overall performance score, 0 to 100. Observed 54 (mobile, google.com) and 100 (desktop, wikipedia.org)."
    }
  },
  "description": "The page speed test result.",
  "additionalProperties": true
}