Track competitor marketplace prices on a schedule

One user lets Grok Bot revisit competitor listings over time and log price changes, though some sites stop it with CAPTCHAs.

Done with Grok Bot· Intermediate· Sep 2026

What they did
They set Grok Bot loose on a few online marketplaces to repeatedly check product pages and competitor offers. The bot handled the browsing on its own and compared prices across visits, but some sites interrupted it with CAPTCHAs. To get past those blocks, they said they were relying on an external API, while others suggested slowing the requests, staying signed in, or sending traffic through the user’s own device.
How it went
The setup worked for routine price monitoring, but it became unreliable on marketplaces that used CAPTCHA checks, including one with a mouse-movement challenge. No savings or speed figures were shared.
Tips
Keep the watchlist small and use a clear schedule so the agent does less unnecessary browsing. Plan for blocked sites up front and have it mark them as inaccessible rather than getting stuck.

Try it yourself with Grok Bot

Check these competitor listings on [marketplaces or links] every [day/week]. For each item, note the current price, stock status, and any changes since the last check in [spreadsheet/location]. If a page is blocked by a CAPTCHA, stop on that site, mark it as blocked, and continue with the rest. Before you do anything that would send a message, place an order, delete data, or submit a form, pause and ask me to approve it first. Return a short summary when you finish.

Fill in the [brackets]. Agents can make mistakes, so review anything before it is sent, paid or deleted.

Read the original on reddit.com ↗

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