Page weight and resource API API

Example request

curl -H "X-API-Key: $DOMSCAN_API_KEY" "https://domscan.net/v1/page-weight?url=https%3A%2F%2Fexample.com"

const response = await fetch("https://domscan.net/v1/page-weight?url=https%3A%2F%2Fexample.com", {
  headers: { "X-API-Key": process.env.DOMSCAN_API_KEY },
});
const data = await response.json();
console.log(data);

import os
import requests

response = requests.get(
    "https://domscan.net/v1/page-weight?url=https%3A%2F%2Fexample.com",
    headers={"X-API-Key": os.environ["DOMSCAN_API_KEY"]},
)
print(response.json())

package main

import (
	"fmt"
	"io"
	"net/http"
	"os"
)

func main() {
	req, err := http.NewRequest(http.MethodGet, "https://domscan.net/v1/page-weight?url=https%3A%2F%2Fexample.com", nil)
	if err != nil {
		panic(err)
	}
	req.Header.Set("X-API-Key", os.Getenv("DOMSCAN_API_KEY"))

	resp, err := http.DefaultClient.Do(req)
	if err != nil {
		panic(err)
	}
	defer resp.Body.Close()

	data, err := io.ReadAll(resp.Body)
	if err != nil {
		panic(err)
	}
	fmt.Println(resp.Status, string(data))
}

require "json"
require "net/http"

uri = URI("https://domscan.net/v1/page-weight?url=https%3A%2F%2Fexample.com")
request = Net::HTTP::Get.new(uri)
request["X-API-Key"] = ENV.fetch("DOMSCAN_API_KEY")

response = Net::HTTP.start(uri.hostname, uri.port, use_ssl: true) do |http|
  http.request(request)
end
puts JSON.pretty_generate(JSON.parse(response.body))

Example response

{
  "url": "https://example.com/",
  "final_url": "https://example.com/",
  "status": "ok",
  "reason": null,
  "checked_at": "2026-10-13T12:00:00.000Z",
  "http_status": 200,
  "redirect_count": 0,
  "duration_ms": 4210,
  "resource_limit_reached": false,
  "summary": {
    "requests": 86,
    "blocked_requests": 4,
    "total_bytes": 3412887,
    "third_party_requests": 22,
    "third_party_bytes": 1210554,
    "transfer_bytes": 3425100
  },
  "by_type": [
    {
      "type": "image",
      "requests": 31,
      "bytes": 1840221
    },
    {
      "type": "script",
      "requests": 28,
      "bytes": 1120334
    }
  ],
  "largest": [
    {
      "url": "https://example.com/hero.jpg",
      "type": "image",
      "bytes": 612004,
      "mime_type": "image/jpeg"
    }
  ],
  "third_parties": [
    {
      "domain": "googletagmanager.com",
      "requests": 3,
      "bytes": 310442
    }
  ],
  "render_blocking": [
    {
      "url": "https://example.com/styles.css",
      "type": "stylesheet"
    }
  ],
  "timing": {
    "ttfb_ms": 180,
    "first_contentful_paint_ms": 1240,
    "dom_content_loaded_ms": 1610,
    "load_ms": 3890
  },
  "findings": [
    "page_weight_over_3mb",
    "images_over_200kb",
    "render_blocking_resources"
  ]
}

HTTP status codes

• 200 OK
• 400 Bad Request
• 401 Unauthorized
• 402 Payment Required
• 429 Too Many Requests