ToolVet
80trust / 100

Pagespeed

by SiteCheck in Other

x402 APIPassing, checked 4 h ago

Google PageSpeed Insights for one public URL: the Lighthouse scores (performance, seo, accessibility, best-practices), the lab Core Web Vitals (FCP, LCP, CLS, TBT, Speed Index), the CrUX field data when Google has it (LCP, INP, CLS), and the top five opportunities with estimated savings. Mobile by default. A run takes 10 to 40 seconds and is cached for an hour. Keyless calls share Google's quota, so a busy moment is a 503.

GET
https://api.sitecheck-api.workers.dev/api/pagespeed
Price
$0.005
per call in USDC
Uptime
100%
last 30 days
Response time
190 ms
1.2 s slowest 5%
Last check
Passed
4 h ago, next any minute now

Run a free test callHow to call it

Reliability

All checks passedSome failedAll failedNot checked

Status and outage history · Atom feed · Watch with other listings

How to call it

GET https://api.sitecheck-api.workers.dev/api/pagespeed

Each call costs $0.005 in USDC on Base, paid with the request over x402.

Run a free test callOne unpaid request, the way an agent sends it. You see the payment challenge it gets back. Nothing is charged.

Example request

From the listing.

GET https://api.sitecheck-api.workers.dev/api/pagespeed?categories=performance&strategy=mobile&url=https%3A%2F%2Fexample.com%2F

Parameters

ParameterTypeRequiredDescription
categoriesstringNoperformance (default), seo, accessibility, best-practices; comma-separated
strategystringNomobile (default) or desktop
urlstringYeshttp or https URL of a public page, e.g. https://example.com/

Example response

The provider's example. We can't check it without paying.

Example response, 43 lines
{
  "categories": {
    "performance": 96
  },
  "checkedAt": "2026-10-15T06:00:00.000Z",
  "fieldData": null,
  "finalUrl": "https://example.com/",
  "labMetrics": {
    "cls": {
      "display": "0",
      "value": 0
    },
    "fcp": {
      "display": "1.1 s",
      "value": 1100
    },
    "lcp": {
      "display": "1.5 s",
      "value": 1500
    },
    "si": {
      "display": "1.4 s",
      "value": 1400
    },
    "tbt": {
      "display": "0 ms",
      "value": 0
    }
  },
  "lighthouseVersion": "12.0.0",
  "measuredAt": "2026-10-15T06:00:00.000Z",
  "opportunities": [
    {
      "estimatedSavingsBytes": null,
      "estimatedSavingsMs": 150,
      "id": "render-blocking-resources",
      "title": "Eliminate render-blocking resources"
    }
  ],
  "source": "Google PageSpeed Insights v5 (Lighthouse lab run; CrUX field data when available)",
  "strategy": "mobile",
  "url": "https://example.com/"
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.005.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://api.sitecheck-api.workers.dev/api/pagespeed?categories=performance&strategy=mobile&url=https%3A%2F%2Fexample.com%2F'

# x402 v2 sends the challenge base64-encoded in the PAYMENT-REQUIRED header (v1 sends it in the body).
# To read the header:
curl -sS -g -o /dev/null -D - 'https://api.sitecheck-api.workers.dev/api/pagespeed?categories=performance&strategy=mobile&url=https%3A%2F%2Fexample.com%2F' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode
JavaScript: pay and call
// npm i @x402/fetch @x402/evm viem
import { wrapFetchWithPayment, x402Client } from "@x402/fetch";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

// Pays at most $0.005 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.005" });
registerExactEvmScheme(client, { signer: privateKeyToAccount(process.env.EVM_PRIVATE_KEY) });
const pay = wrapFetchWithPayment(fetch, client);

// Not sure it's safe to pay? ToolVet checks it first for $0.005. Pay for that from a separate
// client: this one is capped at $0.005 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fapi.sitecheck-api.workers.dev%2Fapi%2Fpagespeed
const res = await pay("https://api.sitecheck-api.workers.dev/api/pagespeed?categories=performance&strategy=mobile&url=https%3A%2F%2Fexample.com%2F");
console.log(res.status, await res.text());
Python: pay and call
# pip install "x402[requests,evm]"
import os
from eth_account import Account
from x402 import x402ClientSync
from x402.http.clients import x402_requests
from x402.mechanisms.evm import EthAccountSigner
from x402.mechanisms.evm.exact.register import register_exact_evm_client

# Pays at most $0.005 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.005"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://api.sitecheck-api.workers.dev/api/pagespeed?categories=performance&strategy=mobile&url=https%3A%2F%2Fexample.com%2F")
    print(res.status_code, res.text)

Security scan

No findings

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Recent checks

WhenResultHTTPTimePrice
4 h agoPassed402190 ms$0.005
9 h agoPassed402648 ms$0.005
13 h agoPassed402152 ms$0.005
22 h agoPassed4021.2 s$0.005