# ISHOB Site Speed & Core Web Vitals

> ISHOB Site Speed & Core Web Vitals is a paid API for AI agents from api.ishob.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-14).

Runs a real headless-Chromium page load (mobile or desktop) from Cloudflare's network to measure Core Web Vitals (LCP, CLS, FCP, TTFB, TBT) and page weight with good/needs-improvement/poor ratings

## Facts

- Endpoint: GET https://api.ishob.com/v1/site-speed?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/ishob-site-speed-core-web-vitals-7ce2af0f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_NXFxyfomNjIpuzNRdNgQQ

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability ishob-site-speed-core-web-vitals-7ce2af0f
```

Example prompt: Can you run a real headless-Chrome page speed test on https://www.example.com on mobile and tell me the LCP, CLS, FCP, TTFB scores with their good/needs-improvement/poor ratings and how heavy the page is?

## When to prefer this

Choose this endpoint when you need real browser-based Core Web Vitals measurements (not synthetic Lighthouse scores or field data aggregates) run from Cloudflare's network without throttling. Ideal for programmatic performance checks, CI/CD pipelines, SEO audits, or competitive benchmarking where you need LCP, CLS, FCP, TTFB, and TBT with clear good/needs-improvement/poor ratings and resource-level page weight data.

## Known failure modes

- URL is unreachable or returns an error — endpoint may return an error or empty metrics
- robots.txt disallows crawling — the test will be skipped to respect the directive
- Invalid URL format — request rejected with validation error
- Timeout if the page takes too long to load or has infinite redirects
- Non-HTTP/HTTPS URL schemes — likely rejected by URL validation

## How this service works

Page speed & Core Web Vitals from a real headless-Chromium load (mobile or desktop): LCP, CLS, FCP, TTFB, total blocking time with good/needs-improvement/poor ratings, load timings, request count and page weight by resource type. Unthrottled lab run from Cloudflare's network (not Lighthouse, not field data). robots.txt respected.

## Output

Returns a JSON object with: an overall rating (good/needs-improvement/poor), individual Core Web Vitals metrics (LCP, CLS, FCP, TTFB, Total Blocking Time) each with their numeric value and rating, total number of HTTP requests, and total transfer size in bytes — all measured from a real unthrottled headless-Chromium load from Cloudflare's network.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "url"
     ],
     "properties": {
      "url": {
       "type": "string",
       "format": "uri",
       "maxLength": 2048
      },
      "device": {
       "enum": [
        "mobile",
        "desktop"
       ],
       "type": "string",
       "default": "mobile"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "weight": {
   "requests": 38,
   "total_transfer_bytes": 412345
  },
  "overall": "good",
  "core_web_vitals": {
   "cls": {
    "value": 0.02,
    "rating": "good"
   },
   "lcp_ms": {
    "value": 1210,
    "rating": "good"
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/ishob-site-speed-core-web-vitals-7ce2af0f/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.ishob.com](https://www.zero.xyz/host/api.ishob.com/llms.txt)