Search Google advertisers

When to use this

Use it to turn a brand name into the advertiser_id that company ads (google_company_ads) needs, or to find a website to pass there as domain. Big brands often have one advertiser per country or agency. Pick one by region and number_of_ads_estimate.

You get the same suggestions as the search box on adstransparency.google.com: up to 10 advertisers and 10 websites, in one call. Only ads shown in region (default US) are counted, so the list changes by region. Pass ALL to count every region.

Example request

Copy one and replace YOUR_API_KEY with your API key (get one free). The code versions read the key from the LURKAPI_API_KEY environment variable instead.

curl "https://api.lurkapi.com/v1/google/adLibrary/advertisers/search?query=nike" \
  -H "x-api-key: YOUR_API_KEY"

const params = new URLSearchParams({
  query: "nike",
});
const res = await fetch(`https://api.lurkapi.com/v1/google/adLibrary/advertisers/search?${params}`, {
  headers: { "x-api-key": process.env.LURKAPI_API_KEY },
});
const data = await res.json();
if (!data.success) throw new Error(`${data.code}: ${data.error}`);
console.log(data.advertisers);

import os
import requests

res = requests.get(
    "https://api.lurkapi.com/v1/google/adLibrary/advertisers/search",
    params={
        "query": "nike",
    },
    headers={"x-api-key": os.environ["LURKAPI_API_KEY"]},
    timeout=60,
)
data = res.json()
if not data["success"]:
    raise RuntimeError(f"{data['code']}: {data['error']}")
print(data["advertisers"])

package main

import (
	"encoding/json"
	"fmt"
	"net/http"
	"net/url"
	"os"
	"time"
)

func main() {
	params := url.Values{}
	params.Set("query", "nike")
	req, _ := http.NewRequest("GET", "https://api.lurkapi.com/v1/google/adLibrary/advertisers/search?"+params.Encode(), nil)
	req.Header.Set("x-api-key", os.Getenv("LURKAPI_API_KEY"))

	client := &http.Client{Timeout: 60 * time.Second}
	res, err := client.Do(req)
	if err != nil {
		panic(err)
	}
	defer res.Body.Close()

	var data map[string]any
	if err := json.NewDecoder(res.Body).Decode(&data); err != nil {
		panic(err)
	}
	if data["success"] != true {
		panic(fmt.Sprintf("%v: %v", data["code"], data["error"]))
	}
	out, _ := json.MarshalIndent(data["advertisers"], "", "  ")
	fmt.Println(string(out))
}

<?php
$params = http_build_query([
    'query' => 'nike',
]);
$context = stream_context_create(['http' => [
    'header' => 'x-api-key: ' . getenv('LURKAPI_API_KEY'),
    'timeout' => 60,
    'ignore_errors' => true,
]]);
$body = file_get_contents('https://api.lurkapi.com/v1/google/adLibrary/advertisers/search?' . $params, false, $context);
$data = json_decode($body, true);
if (!$data['success']) {
    throw new Exception("{$data['code']}: {$data['error']}");
}
print_r($data['advertisers']);

require 'json'
require 'net/http'

uri = URI('https://api.lurkapi.com/v1/google/adLibrary/advertisers/search')
uri.query = URI.encode_www_form(
  'query' => 'nike',
)
req = Net::HTTP::Get.new(uri)
req['x-api-key'] = ENV.fetch('LURKAPI_API_KEY')
res = Net::HTTP.start(uri.host, uri.port, use_ssl: uri.scheme == 'https', read_timeout: 60) do |http|
  http.request(req)
end
data = JSON.parse(res.body)
raise "#{data['code']}: #{data['error']}" unless data['success']
puts JSON.pretty_generate(data['advertisers'])

Parameters

Add them to the URL after a ?, as in ?query=nike. Join several with &.

Example response

A real response, captured from the live API. Lists are trimmed to a couple of items, and long text such as media links is cut short with ….

{
  "success": true,
  "credits_remaining": 999999,
  "credits_charged": 1,
  "advertisers": [
    {
      "name": "Nike, Inc.",
      "advertiser_id": "AR16735076323512287233",
      "region": "US",
      "number_of_ads_estimate": 8000,
      "number_of_ads_range": {
        "min": 8000,
        "max": 9000
      },
      "is_verified": true
    },
    {
      "name": "NIKE SRL",
      "advertiser_id": "AR17365672681860497409",
      "region": "IT",
      "number_of_ads_estimate": 1,
      "number_of_ads_range": {
        "min": 1,
        "max": 1
      },
      "is_verified": true
    }
  ],
  "websites": [
    {
      "domain": "nike.com"
    },
    {
      "domain": "nike.cl"
    }
  ]
}

Response fields

Every field in a successful response, and what it means. A name with [] belongs to each item of a list: advertisers[].name is the name of every item in advertisers. null means there's no value.

Cost and freshness

Each call costs 1 credit. Calls turned away before they reach the platform (invalid parameters, a key or balance problem, a rate limit) are free, and so are 5xx errors. A not_found is charged, since the platform was checked. How charging works.

Answers are cached for up to 1 day. A repeat call within that time can return the same data, and costs the same.

Errors

A failed call returns success: false, an error message, a code your program can check, and a docs link. These are the errors this endpoint can return. All error codes.

Use it in Claude

Connect LurkAPI to Claude and ask in plain English. This endpoint is the google_search_advertisers tool. For example:

Use LurkAPI's google_search_advertisers tool with query "nike", then summarize what you find.

Claude calls google_search_advertisers with arguments like these, and each call costs 1 credit:

{"query": "nike"}

To save tokens, tool results leave out empty fields, keep one URL per image or video, and give transcripts as plain text unless you pass timestamps=true. A result over 45,000 characters comes in parts. Its _note gives the offset for the next part, and later parts are free for 15 minutes. Pass trim=false for the full response.