I made Claude and Manus watch diaper prices for me. Scheduled tasks + browser use is an underrated combo.

New father life means diapers. A lot of diapers. I order the same pack from FirstCry every few weeks, and the pricing on that site is chaotic. The same product swings from ~₹580 to over ₹1,000 depending on when you catch it. I usually wait for the ~₹600 range post-discounts, but between feeds and nap schedules, checking manually gets old fast.

Both Claude and Manus now have scheduled tasks and browser-use. I gave each a prompt: check this product’s price periodically, notify me on Slack if it drops below ₹650. Both set it up in one go. Test notification came through, done.

The average price hovers around ₹900. Getting it at ~₹580 with stacked discounts, repeatedly, without lifting a finger, adds up. I’m going to set this up for every product I reorder regularly.

The implementation difference between the two was the surprise. Claude did standard browser automation, navigated the site, read the page, compiled a report. Manus analyzed the network calls FirstCry was making, found the underlying coupon API that returns the best possible price after all discounts, and used that directly. No browser navigation needed. I wasn’t expecting that.

I took what Manus found and asked Claude to use the same API approach. Now the scheduled task hits the API directly, runs faster, and skips the flaky browser step entirely.

Prompts used
  • You are a price monitoring agent. Your job is to check the price of a specific product on FirstCry using their coupon API and send a Slack DM if the price is below ₹650. ## Product Details - **Product**: Pampers Premium Care Softest Ever Diaper Pants (M) Size - 54 Pieces - **Product URL**: [firstcry product link] - **Price threshold**: ₹650 ## Steps 1. **Fetch price and coupon data from the FirstCry API**: - Navigate to the coupon API URL with the product's brand ID, category, MRP, and product ID - Read the JSON response - Parse to extract: `bestPrice` (regular users), `bestPriceClub` (Club members), `couponinfo` (available coupons), `bankinfo` (bank offers) 2. **Evaluate and notify**: - If `bestPrice` is below ₹650, send a Slack notification with the price breakdown, best coupon code, bank offers, and a direct buy link - If `bestPrice` is ₹650 or above, skip notification. Just note the price was checked. 3. **Clean up**: Close any browser tabs opened during the check. ## Fallback - If the API fails, navigate to the product page directly and extract the price visually from a screenshot - If everything fails, send a failure notification via Slack
Claude scheduled task configured to monitor FirstCry diaper prices daily via the coupon API
Slack notifications from both Manus and Claude showing price alerts with coupon codes, bank offers, and best prices for the diaper pack