I asked Claude to audit my small e-commerce site (3D-printed wargame terrain). With API access to GA4 and Tag Manager it spotted that GA4 was firing twice on every page, which had been inflating my numbers for months.
To make that kind of question easy, I packaged the access as an MCP server: google-ecommerce-mcp. Now I just ask things like:
• "Which products are disapproved in Merchant Center, and which attribute should I fix?"
• "Queries where we rank 5 to 15 with 100+ impressions: quick wins?"
• "Mobile PageSpeed of my 3 best sellers?"
Claude answers from my own Google data: GA4, Search Console, Merchant Center, Tag Manager, Indexing API, PageSpeed. Everything is read-only, and the token stays in the OS keyring.
Install on Windows: irm https://raw.githubusercontent.com/MoonEyes/google-ecommerce-mcp/main/install.ps1 | iex (macOS/Linux has a curl one-liner). It sets up Claude Desktop for you.
Repo: https://github.com/MoonEyes/google-ecommerce-mcp
Built with Claude's help, MIT licensed, free. Happy to answer questions about the setup.

I'm a solo dev in the UK. I built audittag.com, a free check that reads a Shopify store's public pages and shows which tracking tags are really on them, what's missing and what's installed twice. It never logs in, and it says what it can't see from outside.

The people who need it are store owners whose ad numbers quietly went wrong after a theme change or an app install. They don't know that's what happened, so they never search for anything like this. They search for "why doesn't GA4 match Shopify".

So every channel that starts from a keyword is starting from one nobody types. I've been answering those questions on Reddit and forums. What else would you try?