Chrome UX Report (CrUX) API

by developer.chrome.com

SEO and site checks Added on November 1st, 2026 Checked and working on November 1st, 2026

What it does

The Chrome UX Report API returns real-user speed data from Chrome for a page or a whole origin: Core Web Vitals such as LCP, INP and CLS as histograms and percentiles. Use it to watch how fast a site really is for visitors. Send a POST request with a JSON body naming the origin or URL and optionally the device type; data is a 28-day rolling average updated daily. Free with a free Google Cloud API key, 150 queries per minute.

API
JSON
REST

At a glance

API key: Needed, free · More APIs with a free key
Pricing: Free with a free Google Cloud API key, 150 queries per minute.
Formats: JSON
Interface: REST
Provider: developer.chrome.com
Last checked: Working on November 1st, 2026

More information: https://developer.chrome.com/docs/crux/api

Compare: Google PageSpeed Insights API vs Chrome UX Report (CrUX) API

Used in: Check a website's security, HTTPS and speed with free APIs

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HTML

<a href="https://free-web-services.com/web-services/web-development/seo/chrome-ux-report-crux-api.html"><img src="https://free-web-services.com/badge.svg" width="208" height="44" alt="Listed on Free Web Services" /></a>

Markdown

[![Listed on Free Web Services](https://free-web-services.com/badge.svg)](https://free-web-services.com/web-services/web-development/seo/chrome-ux-report-crux-api.html)

Chrome UX Report (CrUX) API — developer.chrome.com

Example request

curl

curl -X POST 'https://chromeuxreport.googleapis.com/v1/records:queryRecord?key=YOUR_API_KEY' \
  -H 'Content-Type: application/json' \
  -d '{"origin": "https://www.wikipedia.org"}'

JavaScript

const response = await fetch("https://chromeuxreport.googleapis.com/v1/records:queryRecord?key=YOUR_API_KEY", {
  method: 'POST',
  headers: {
    "Content-Type": "application/json",
  },
  body: JSON.stringify({"origin":"https://www.wikipedia.org"}),
});
const data = await response.json();
console.log(data);

Python

import requests

response = requests.post(
    "https://chromeuxreport.googleapis.com/v1/records:queryRecord?key=YOUR_API_KEY",
    headers={
        "Content-Type": "application/json",
    },
    json={
        "origin": "https://www.wikipedia.org",
    },
    timeout=30,
)
print(response.json())

Replace YOUR_API_KEY with your own key.