Google Ad Library

GET /v1/ad-library/google/advertiser-search

Google Advertiser Search API

Find Google Ads Transparency AR… entities — ranked multi-result (1 credit).

1 credit per request

Try in Playground Get your API key — free Read the docs

TL;DR

Find Google Ads Transparency AR… entities — ranked multi-result (1 credit). The Google Advertiser Search API (Google Ad Library) is a single authenticated GET request to /v1/ad-library/google/advertiser-search that responds with clean JSON and costs 1 credit. Pass cache=true for a free 24h cache hit; default is always fresh. Start with 100 free credits — no credit card.

What is the Google Advertiser Search API?

Search advertisers on Google Ads Transparency and get ranked AR… entities with name, url, optional country/adsCount. Brand queries are expanded (nike → Nike, Inc. + regional entities) so country=US prefers the parent company over NIKE SRL. Pass advertisers[0].id into /google/company-ads?advertiser=AR… to complete the chain. Flat 1 credit.

What you get

Ranked, structured result list
Title, URL, author, and thumbnail per result when available
Engagement metrics where the platform exposes them
Configurable result limit

Try it

Open in Playground

Fill in the parameters below and copy a ready-to-run request, or open the live Playground to run it against your account (no API key paste).

Parameters

q*stringBrand, domain, or advertiser name (min 2 characters). Expanded + ranked so US prefers Inc. over SRL.countryoptionalstringTwo-letter ISO country code used for ranking (e.g. US). Default US.limitoptionalintegerMax items to return (default 10, max 50). Flat 1 credit per call.cacheoptionalbooleanSet true to serve from the 24h response cache (0 credits on hit). Default false — always fetch fresh. Envelope includes cached + cachedAt on hits.

API keyoptionalPaste your key to get a ready-to-run snippet. It stays in your browser.Sign in to run live

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_..."

Edit the parameters and the code updates instantly. Switch languages and hit copy.

Example response

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

Billing metadata is returned in response headers: X-Captapi-Credits (credits charged), X-Captapi-Cache (hit or miss), and X-Captapi-Source. Failed requests (4xx/5xx) are never charged. See the full list of error codes in the error reference.

Response structure

A successful call returns success, cached, creditsUsed, and a data object with the following fields:

Top-level fields

queryThe search query you sent.
countryCountry for the request context. On popular-creators top-level: ISO feed market you queried (e.g. US) — not each creator's home country (see region).
totalReturnedNumber of items returned in this response.

Advertisers

Each item in advertisers contains:

idStable platform ID for the item.
nameName of the item or account. On profile endpoints: deprecated alias of displayName (one release).
urlCanonical URL of the item.

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.

Authentication: send your key as Authorization: Bearer capt_live_.... A typical call costs 1 credit. Pass cache=true for a free 24h cache hit; default is always fresh.

Using an AI agent? This endpoint is the MCP tool google_ad_library_advertiser_search via @captapi/mcp. Set it up →

How it works

1. Sign up — get 100 free credits, no card required.
2. Create a key from your dashboard.
3. Send one request to /v1/ad-library/google/advertiser-search and parse the JSON response.

Use cases

Trend Discovery

Find trending content by keyword or hashtag.

Content Sourcing

Build feeds and playlists programmatically.

Monitoring

Track topics, brands, and competitors.

Research

Sample large sets of content for analysis.

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.

More Google Ad Library APIs

Google Company Ads API Google Ad Details API

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