Google Ads Transparency MCP Server

An MCP server that lets AI assistants look up any advertiser's Google ads. Search by domain or company name, retrieve ad creatives, and decode text ad content — all from Google's Ads Transparency Center.

No API key. No paid service. No browser required.

Google has no official API for their Ads Transparency Center. The only open-source option was an abandoned Python package (last commit July 2023, broken domain search, crashed on image ads). Paid alternatives start at $75/mo. This project fixes the scraper and wraps it as an MCP server so any AI assistant can query Google's ad database directly.

Tools

| Tool | Description | |------|-------------| | search_advertiser_by_domain | Find an advertiser by website domain (e.g. nike.com) | | search_advertisers | Search advertisers by keyword or company name | | get_ads | Get ads for an advertiser with decoded content | | get_ad_detail | Get full details for a specific ad creative | | compare_advertisers | Active ad count per domain across a competitor set, with a status per row | | advertiser_summary | Format mix, copy sample and destination hosts for one advertiser | | fetch_ad_creative | Download one creative — the image file, or video sampled to frames | | download_ad_creatives | Bulk-download an advertiser's creatives into a folder with a manifest |

Install

# With uvx (recommended)
uvx google-ads-transparency-mcp

# With pip
pip install google-ads-transparency-mcp

Optional: video creatives

Downloading video ads needs yt-dlp and ffmpeg on your PATH:

brew install yt-dlp ffmpeg      # macOS

Everything else works without them. If they are missing, only the video download tools fail, and they say which binary is absent.

Configure

Claude Code

claude mcp add google-ads-transparency -- uvx google-ads-transparency-mcp

Claude Desktop

Add to your claude_desktop_config.json:

{
  "mcpServers": {
    "google-ads-transparency": {
      "command": "uvx",
      "args": ["google-ads-transparency-mcp"]
    }
  }
}

Cursor / VS Code

Add to your MCP settings:

{
  "mcpServers": {
    "google-ads-transparency": {
      "command": "uvx",
      "args": ["google-ads-transparency-mcp"]
    }
  }
}

Example Usage

Once connected, ask your AI assistant things like:

• "What ads is nike.com running?"
• "Search for crypto exchange advertisers on Google"
• "Get the last 5 ads from Coinbase"
• "Look up ad details for advertiser AR05099026886533578753"

Example: Domain Search

> search_advertiser_by_domain("nike.com")

{
  "advertiser_id": "AR14188379519798214657",
  "name": "Nike, Inc.",
  "ad_count": 1842
}

Example: Get Ads with Decoded Text Content

> get_ads("Coinbase", count=1)

[
  {
    "advertiser_id": "AR09076382774528",
    "creative_id": "CR10813648716908961793",
    "format": "text",
    "last_shown": "2025-01-15",
    "advertiser_name": "Coinbase",
    "content": {
      "preview_url": "https://ads-rendering-prod.corp.google.com/search?...",
      "headline": "Most Trusted Crypto Exchange",
      "description": "Buy, Sell & Trade Bitcoin, Ethereum & More...",
      "destination_url": "coinbase.com"
    }
  }
]

How It Works

This server reverse-engineers Google's internal RPC endpoints:

| Endpoint | Purpose | |----------|---------| | SearchService/SearchSuggestions | Keyword/domain search | | SearchService/SearchCreatives | Get ad creative IDs by advertiser | | LookupService/GetCreativeById | Get individual ad details |

Text ads carry their copy in the overlay parameter of the creative preview URL: urlsafe base64 wrapping gzip wrapping protobuf, whose named fields give the headline, description and destination URL exactly rather than by guesswork. Text ads rendered through content.js instead carry the same triple in a data-p attribute, which is decoded too.

Image and video ads hand back a JavaScript renderer instead of an asset. The server fetches it and pulls out the real simgad image URL, or the YouTube video id plus the on-creative headline and button label.

Rate limiting

Google throttles these endpoints per source IP and answers a bursty client with an HTTP 429 and a CAPTCHA interstitial. Requests are spaced out and retried with backoff. If your IP is already blocked the tools raise AdsTransparencyBlocked rather than returning empty results, so it is obvious what happened.

An empty result never means "blocked" — that distinction is the whole point of the exception. If you see one, the advertiser really has no ads.

Blocks are per address, not per host, and IPv4 and IPv6 are blocked separately. A machine whose IPv6 is banned will still work over IPv4, which is worth knowing before concluding a host is burned.

Routing Around a Blocked IP

If your own IP is blocked, the scraper can borrow another machine's. Set a proxy for this package alone:

export GOOGLE_ADS_TRANSPARENCY_PROXY=socks5h://127.0.0.1:1080

The h matters. socks5h resolves DNS at the proxy; socks5 resolves it locally. If a local resolver blocks ad hosts — NextDNS nulls out tpc.googlesyndication.com, where the image creatives live — only socks5h can reach them.

This variable is read instead of the ambient HTTP_PROXY/ALL_PROXY, on purpose: routing an entire machine through a proxy to fix one host is both a privacy change and a good way to break unrelated tools.

| Value | Effect | |-------|--------| | unset | Walk the route chain below, advancing when a route is blocked or unreachable | | a proxy URL | Use it and nothing else | | direct / none | Force a direct connection, skip the checks |

With the variable unset the scraper tries, in order:

1. Residential — a rotating residential proxy, if ~/.config/google-ads-transparency/residential-proxy exists. One line, the full socks5h://user:pass@host:port URL. Every request exits from a different IP, so per-IP bans never stick, and the file lives outside the repo so it cannot be committed. Proxy credentials are scrubbed from error text before it is returned.
2. Direct — your own connection.
3. Tunnel — a SOCKS relay at 127.0.0.1:1080, if something is listening there.

Because an unset variable auto-detects, no MCP client registration needs to know about any of this, and nothing breaks when none of it is set up.

Relaying through a remote host

scripts/socks_over_ssh.py is a local SOCKS5 proxy that relays each connection through an SSH exec channel to a host you name. It exists in that shape for hosts whose sshd sets AllowTcpForwarding no, which refuses ssh -D; exec channels are not covered by that directive, so it needs no server-side change.

python scripts/socks_over_ssh.py --ssh-target my-box          # any ~/.ssh/config alias
curl -s --socks5-hostname 127.0.0.1:1080 https://api.ipify.org  # prints the remote IP

Keep it alive with whatever your OS uses (a launchd agent on macOS, a systemd user unit on Linux) and the scraper picks it up automatically.

Security posture, since this is an unauthenticated proxy:

• Loopback only. The script refuses to bind anything but 127.0.0.1, so it is reachable from this machine and nowhere else.
• No agent forwarding (ssh -a), so the remote host is never handed this machine's keys. Also no X11 (-x) and no pty (-T).
• No server-side change. The remote sshd config is untouched.
• Nothing else is routed through it. Only this package reads the variable that points at it.

If the tunnel is down, the tools say so rather than failing obscurely, and the scraper moves on to the next route.

Use as a Python Library

from google_ads_transparency_mcp import GoogleAdsTransparency

client = GoogleAdsTransparency()

# Search by domain
advertiser = client.search_advertiser_by_domain("nike.com")
print(advertiser)  # {"advertiser_id": "...", "name": "Nike, Inc.", "ad_count": 1842}

# Get ads with decoded content
ads = client.get_ads("Coinbase", count=5)
for ad in ads:
    print(ad["format"], ad["content"])

# Region-specific search
client_uk = GoogleAdsTransparency(region="GB")

Getting the Creatives Themselves

The ad copy is only half the story. Both download tools write real files to disk and return their paths, so the creatives can go straight into a deck, a report, or a vision model.

Images are always saved at their original resolution — the file you get back is the creative as it ran, nothing downscaled.

Videos are sampled into JPEG frames, in one of two modes:

| Mode | Frames | Use | |------|--------|-----| | Default | 320px wide, ~12KB each | Vision analysis — cheap enough to send a batch of them | | full_quality=True | Native resolution (e.g. 1080×1080) | Slides, decks, anything a person will look at |

from google_ads_transparency_mcp.frames import download_image, extract_video_frames

# Full-resolution image creative
path = download_image(ad["content"]["image_url"], "out/", name=ad["creative_id"])

# Deck-quality stills from a video ad
result = extract_video_frames(
    ad["content"]["video_url"], "out/", frames=4, full_quality=True
)
print(result["frames"])    # ['out/frame_01.jpg', ...]
print(result["video_path"])  # the downloaded video itself

Collecting a whole advertiser

download_ad_creatives pulls a batch in one call. Each creative gets its own subfolder, and a manifest.json records every file alongside its decoded copy, format and last-shown date — which is what you want when assembling examples.

> download_ad_creatives("Buildkite", out_dir="creatives/", count=10)

creatives/
├── manifest.json
├── CR04431036747610062849/
│   └── CR04431036747610062849.png     # 400×400, as it ran
└── CR01542648288744833025/
    ├── frame_01.jpg                   # 1080×1080 stills
    ├── frame_02.jpg
    └── video.mp4

One dead creative never sinks the batch — it gets an error field in the manifest and the rest continue.

Comparing and Summarising Advertisers

Two tools turn the raw lookups into the questions people actually ask.

Who in this market is running ads, and how many?

client.compare_advertisers(["nike.com", "adidas.com", "github.com"])

[
  {"domain": "nike.com",   "status": "ok", "advertiser_name": "Nike Retail BV",      "ad_count": 100000, "parent_entity": false},
  {"domain": "adidas.com", "status": "ok", "advertiser_name": "Adidas America, Inc", "ad_count": 3000,   "parent_entity": false},
  {"domain": "github.com", "status": "ok", "advertiser_name": "TRENT SLADE",         "ad_count": 1000,   "parent_entity": true,
   "note": "resolves to 'TRENT SLADE', which shares no name token with 'github.com': ... Do not cite ad_count as this domain's own."}
]

Every row carries a status, and the distinction matters:

| Status | Meaning | |--------|---------| | ok | An advertiser was found; ad_count is Google's active-ads figure | | absent | No advertiser is registered for that domain. A genuine zero. | | blocked | Google rate-limited the lookup. Not a zero. Never cite it as one | | error | Anything else; the note says what |

Once every egress route is blocked, the remaining domains are marked blocked without further requests rather than hammering a ban.

parent_entity is the guard against the mistake that produces confidently wrong numbers. Domain search returns whoever's ads mention the domain, which can be the parent company, a reseller, or a stranger. When the advertiser name shares no word with the domain the row is flagged and carries a note. It is a heuristic: it flags, it does not filter. Pass company_names={"gh.io": "GitHub"} to sharpen the check for domai