SiteCheck PageSpeed Insights

x402

SiteCheck PageSpeed Insights is a paid API for AI agents from api.sitecheck-api.workers.dev, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-16).

Runs a Google PageSpeed Insights / Lighthouse audit on a public URL and returns performance scores, Core Web Vitals, and optimization opportunities

Price / call$0.005

Seller volume →—

Success—

StatusUnknown

How this service works

Pay-per-call tools for AI agents: image generation, speech-to-text, text-to-speech, embeddings, LLM chat, website audits and contact enrichment, web page to Markdown reader, PDF to text, sitemap URLs, tech stack detection, translation, exchange rates, e-mail pre-check, domain RDAP/DNS lookup, Solana token checks, trending tokens and wallet holdings, plus business and compliance data (EU VAT/VIES, IBAN, LEI/GLEIF, US recalls, OSHA/EPA violations, UK insolvency notices). Also: SEO metadata, link checking, redirect chains, security headers, mail DNS (SPF, DMARC, DKIM), QR codes, language detection, photo EXIF, identifier validation, image OCR, SEC filings, SEC financials, Congress bills, macro rates, UK company data, GitHub repo stats, Hacker News, Wikipedia, gas prices, Solana swap quotes, ERC-20 token checks, ENS names, EVM wallet balances, EVM balances, transactions and contract calls, Solana transactions and accounts, crypto prices, candles and order books, DeFi TVL, yields and stablecoins, SEC insider trades, weather, geocoding and holidays, IP owners and postcodes, npm, PyPI and crates package data and vulnerabilities, GitHub profiles, arXiv papers and DOIs, structured extraction, summaries, sentiment and reranking, HTML tables and RSS feeds, Bitcoin fees, addresses and transactions, Bitcoin address balances, Bitcoin transaction status, EVM calldata decoding, verified EVM contracts, Hyperliquid perpetual markets, Hyperliquid account positions, Polymarket odds, crypto fear and greed, DeFi fees, DEX volume, company registries of four countries, ISIN, CUSIP and ticker lookup, SEC full-text search, SEC 8-K events, FDA drug labels, FDA adverse event counts, clinical trials, PubMed articles, US federal grants, EU public tenders, NPI provider lookup, US address geocoding, USGS earthquakes, NWS weather alerts, sunrise and moon times, time zone conversion, distance and bearing, GDACS disaster alerts, llms.txt checks, AI crawler access, tracker and cookie audits, certificate transparency, site logos and icons, GitHub releases, GitHub issues, Stack Overflow answers, read-only Wikidata queries, text moderation, image descriptions, text classification, named entity extraction, PII redaction, phone number checks, cron explanations, JSON Schema validation, whale transfers, SSL certificate expiry, Markdown to HTML, PageSpeed scores, Product Hunt launches, sanctions screening (OFAC, EU, UN, UK), flight fare search, YouTube transcripts, speech to text from media links, perpetual funding rates, crypto technical indicators, crypto news headlines, crypto spot conversion, World Bank macro indicators, loan and investment calculator, grammar checks, readability scores, keyword extraction, text diffs, transliteration and slugs, text chunking, subtitle translation, tone rewrites, working days, date calculations, unit conversion, book lookup, food nutrition, airport lookup, tide predictions, nearby places, robots.txt checks, hashes, encode and decode, JWT inspection, UUIDs and passwords, User-Agent parsing, subdomain discovery, uptime checks, VIN decoding, UK EORI checks, SWIFT and BIC checks, stock ticker lookup, invoice extraction, resume parsing, address parsing, prediction-market data, multi-chain RPC and chain data, compliance and government data, web data, search and research, AI text jobs. Plus prediction-market search, briefs, quotes and unsigned buy transactions, powered by Panta. Payment: x402, USDC on Base, Solana or Arc. No signup, no API key.

Output

Returns a JSON object with the audited URL, strategy used, timestamp, overall category scores (e.g. performance: 96), lab metrics for LCP, CLS, FCP, TBT, and Speed Index with human-readable display values, optional CrUX field data, a list of improvement opportunities with estimated time/byte savings, and the Lighthouse version used.

Example use cases

Pre-launch performance gate check

“Before we go live, run a mobile Lighthouse performance audit on https://staging.myapp.com/ and tell me if the score is above 90 and whether LCP is under 2.5 seconds.”

Competitor website benchmarking

“I want to compare our site's performance against a competitor — can you audit https://competitor.com/ on desktop and give me the performance score and Core Web Vitals?”

SEO and accessibility audit

“Run a PageSpeed audit on https://myblog.com/landing-page on mobile, but check SEO and accessibility categories this time — I want to know where we're losing points.”

Technical details

Endpoint

GEThttps://api.sitecheck-api.workers.dev/api/pagespeed?utm_source=zero.xyz

When to prefer

Use this endpoint when you need a real Lighthouse lab run with Core Web Vitals (LCP, CLS, FCP, TBT, SI) and actionable optimization opportunities for a public URL. Prefer it over generic HTTP checkers when you need Google's PageSpeed score specifically, want CrUX field data when available, or need to compare mobile vs. desktop performance with estimated savings per opportunity.

Side effects

URL is not publicly accessible or returns a non-200 status — audit may fail or return incomplete data
Private/intranet URLs that Lighthouse cannot reach
Very slow pages may time out during the lab run
Invalid URL format causes a 400-level error
categories or strategy values outside allowed enums may be rejected

Input

Schema · Request body

Field	Type	Description
inputrequired	object
output	object

Output

Schema · Response

{
  "type": "json",
  "example": {
    "url": "https://example.com/",
    "source": "Google PageSpeed Insights v5 (Lighthouse lab run; CrUX field data when available)",
    "finalUrl": "https://example.com/",
    "strategy": "mobile",
    "checkedAt": "2026-10-15T06:00:00.000Z",
    "fieldData": null,
    "categories": {
      "performance": 96
    },
    "labMetrics": {
      "si": {
        "value": 1400,
        "display": "1.4 s"
      },
      "cls": {
        "value": 0,
        "display": "0"
      },
      "fcp": {
        "value": 1100,
        "display": "1.1 s"
      },
      "lcp": {
        "value": 1500,
        "display": "1.5 s"
      },
      "tbt": {
        "value": 0,
        "display": "0 ms"
      }
    },
    "measuredAt": "2026-10-15T06:00:00.000Z",
    "opportunities": [
      {
        "id": "render-blocking-resources",
        "title": "Eliminate render-blocking resources",
        "estimatedSavingsMs": 150,
        "estimatedSavingsBytes": null
      }
    ],
    "lighthouseVersion": "12.0.0"
  }
}

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