Google Ad Library · Guide

How to run a Google Ad Library advertiser search

TL;DR

To run a Google Ad Library advertiser search, sign up for a free Captapi key, then send one GET request to /v1/ad-library/google/advertiser-search with your input. You get clean JSON back in seconds for 1 credit per call — no OAuth, scraping or platform SDKs. Find Google Ads Transparency AR… entities — ranked multi-result (1 credit).

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How to run a Google Ad Library advertiser search (step by step)

1
Get a free API key
Create a free Captapi account (100 credits, no card) and generate an API key from the dashboard.
2
Call the Google Advertiser Search API
Send an authenticated GET request to /v1/ad-library/google/advertiser-search with your input. No OAuth, no scraping setup.
3
Read the JSON response
Parse the clean JSON response. Pass cache=true for a free 24h cache hit; default is always fresh.

Code example

curl "https://api.captapi.com/v1/ad-library/google/advertiser-search?q=nike" \
  -H "Authorization: Bearer capt_live_..."
# or: -H "x-api-key: capt_live_..."

What the response looks like

{
  "success": true,
  "data": {
    "query": "nike",
    "country": "US",
    "totalReturned": 1,
    "advertisers": [
      {
        "id": "AR17365672681860497409",
        "name": "NIKE SRL",
        "url": "https://adstransparency.google.com/advertiser/AR17365672681860497409"
      }
    ]
  }
}

Billing metadata (credits charged, cache hit/miss) is returned in the X-Captapi-Credits and X-Captapi-Cache response headers.

Request parameters

Name	Type	Required	Description
q	string	Yes	Brand, domain, or advertiser name (min 2 characters). Expanded + ranked so US prefers Inc. over SRL.
country	string	No	Two-letter ISO country code used for ranking (e.g. US). Default US.
limit	integer	No	Max items to return (default 10, max 50). Flat 1 credit per call.
cache	boolean	No	Set true to serve from the 24h response cache (0 credits on hit). Default false — always fetch fresh. Envelope includes cached + cachedAt on hits.

Frequently asked questions

What does the Google Advertiser Search API do?

The Google Advertiser Search API lets you search and return matching results from a public Google Ad Library query using one GET request to /v1/ad-library/google/advertiser-search. It returns clean JSON — no OAuth or infrastructure setup required.

How many credits does the Google Advertiser Search API cost?

Each successful call costs 1 credit. Pass cache=true to serve from the 24h cache (0 credits on hit); default is always fresh. Hits include cached + cachedAt. Selected profile endpoints also accept cacheMaxAge=1d|3d|7d|14d|30d. Failed or empty results are never charged.

Do I need a Google Ad Library API key or OAuth?

No. A single Captapi key works across every platform Captapi supports — YouTube, TikTok, Instagram, Facebook, Twitter/X, Reddit, Threads, Bluesky, Pinterest, LinkedIn, Rumble, Spotify, Kwai, and more. We handle proxies, rate limits, retries, and authentication for you.

How do I get Nike, Inc. creatives (not NIKE SRL)?

Call advertiser-search?q=nike&country=US — results are expanded and ranked so Nike, Inc. leads, with regional entities (SRL, BV) listed after. Pass advertisers[0].id into /google/company-ads?advertiser=AR…. Using a bare name/domain on company-ads also resolves, but AR… is deterministic.

Is the Google Advertiser Search API suitable for production use?

Yes. It is a stable REST endpoint with predictable JSON and automatic retries. Pass cache=true to serve from the 24h cache (0 credits on hit); default is always fresh. Hits include cached + cachedAt. Selected profile endpoints also accept cacheMaxAge=1d|3d|7d|14d|30d. Use it for analytics, monitoring, and content automation.

Ready to run a Google Ad Library advertiser search?

Start free with 100 credits — no credit card required.

Get your free API key