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 the website to pass as domain. Big brands have one advertiser per country or agency; pick by region and number_of_ads_estimate.

The same suggestions as the search box on adstransparency.google.com: up to 10 advertisers and 10 websites, no pagination. region (default US) counts only ads shown there, so the list changes by region; pass ALL for every region.

Parameters

All parameters go in the query string.

Example request

Replace YOUR_API_KEY with your key, or set LURKAPI_KEY for the code. Get a free key.

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?${params}`, {
  headers: { "x-api-key": process.env.LURKAPI_KEY },
});
const data = await res.json();
if (!data.success) throw new Error(`${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_KEY"]},
    timeout=60,
)
data = res.json()
if not data["success"]:
    raise RuntimeError(f"{data['code']}: {data['error']}")
print(data["advertisers"])

Example response

A real response from this endpoint, captured from the live API and trimmed to a couple of items. Strings over 96 characters (mostly signed media URLs) are cut short and end in ….

{
  "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 of a successful response. [] marks a list: a[].b is the b of each item in a. nullable fields can be null; optional fields can be missing.

Caching and freshness

Responses are cached for up to 1 day, so a repeat call within that window can return the same data. It still costs 1 credit.

Errors

Errors return { success: false, error, code, docs } with the HTTP status below. Validation errors, 401/402/429 rejections and 5xx failures are free; not_found is charged (how charging works). All error codes.

Use it in Claude

Once LurkAPI is connected to Claude, this endpoint is the google_search_advertisers tool. Ask in plain English, for example:

Use LurkAPI's google_search_advertisers with query "nike" and summarize what you find.

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

{
  "query": "nike"
}

Tool results skip nulls and empty lists to save tokens.