Cartcanary
Know when a Shopify store can't take money
I paid for traffic to a Shopify store whose cart was quietly dead. The homepage loaded fine, so nothing looked broken. The add-to-cart call was failing, and the only signal was the ad spend leaving my account.
Cartcanary is the check I wish I had run: https://cartcanary-sage.vercel.app
Paste a store URL and it runs a live probe of the buy path: homepage, products.json, POST /cart/add.js, cart.js. Nothing to install, no app in the Shopify admin, no Admin API keys, and it never completes a checkout.
It targets classic Online Store Ajax carts. Hydrogen, headless, and bot walls come back as unsupported rather than passing silently, because "I cannot see this store" is a different answer than "this store is fine."
Pro is $29/mo for 3 stores, Agency is $99/mo for 15. Go probe your own store and tell me what it says.
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