Fat Brain Toys Dimpl Stack | 3 sellers, live prices, prepared checkout

Built for shopping agents: what RoboTrunk does for every product

We asked shopping agents, including Meta's Muse first-hand, what they need from a store. This is what they asked for, and what we have built.

RoboTrunk is working through its catalogue, so a step may not be done for this one yet. Where a step is done per product, the line ends with what is done for this product.

• Deep research: We read the maker's manual, independent reviews, video review transcripts and the store's own page, and publish each finding with its source and the date read. check_product returns them with a source for each. This product: 10 checked facts, research depth quick pass, checked 2026-09-23T20:36:51.228Z, in the evidence pack.
• Receipts: Every published fact has a receipt showing its source quote. check_product and get_product return the checked facts that have one. This product: each checked fact listed below has one; the source quotes are in the evidence pack.
• Safety: check_product asks the product-safety regulators live (US CPSC, NHTSA and FDA, Health Canada, the UK's OPSS, Australia's ACCC) whether a recall names a product, listed here or not, and flags a match with its notice; a recall never blocks the buyer. This product: this page holds no recall result for it yet; check_product asks the regulators now.
• Recall watch: watch_recalls tells the buyer if a product bought here is recalled later.
• Second-hand listings: check_listing runs the same recall check on a second-hand listing someone found, and adds what the listing leaves out and the price new.
• The real price: The full price to the buyer's country, with shipping and tax, each part quoted from the store's policy or, where a part is not settled, what the total depends on: check_product and search_catalog take the buyer's country and postcode. This product: this store's price was read from its catalogue at 2026-10-23T19:46:52.660Z.
• A checkout that finishes: RoboTrunk lists only stores whose agent checkout it has verified. create_checkout prepares the order at the store; complete_checkout returns a link to the store's own checkout. The checkout can be finished in either of two ways: the person taps the link in their own browser, or their agent opens it and completes the checkout. RoboTrunk checks the store's total against a budget ceiling before it issues the link. Payment always happens on the store's own page, and RoboTrunk never holds the money. No store pays for placement; RoboTrunk may earn a commission from some stores via their affiliate programs.
• Markdown copy: Every page has a Markdown copy: this page's copy.
• Photos and ratings: Search results carry the product photo and, where the store's own page publishes one, its rating (search_catalog).
• Fit answers: check_fit answers whether a listing fits a car, pram or bottle, with the exact quote from the store's page, or says it is not known.
• Back-in-stock watches: watch_back_in_stock starts a watch on a listing the store shows as sold out; get_back_in_stock_watch shows when it is back in stock.
• Maker's manual: ask_product_manual answers from the maker's manual with the exact passage and page, or says the manual does not cover it.
• Tools and guide: Every tool and its description is at https://robotrunk.com/mcp; the guide is at /agents.md.
• Research from other stores: Coming soon: reading other stores' listings of the same product as new research sources.

Checked facts

Each fact below was checked against the source it cites before it was published. Each carries that source's link and the time RoboTrunk read it. 10 checked facts, checked 2026-09-23T20:36:51.228Z. Research depth: quick pass. Quick pass: researched from the store's own listing and 2 outside sources (Canadian distributor product-information page; Independent developmental-toy review and specification summary) in one five-minute research turn, then checked by the grader. A deeper read of every page may follow later.

These facts were checked on babiesrus.com.au's listing of the same product, not on this store's listing.

• Design: Each cup has a squishy silicone bubble with its own embossed texture.. Source: https://babies-r-us-australia-development-store.myshopify.com/products.json (listing), read 2026-09-23T19:03:48.491Z.
• Age guidance: The distributor rates Dimpl Stack for ages 6 months and older.. Source: https://outsetmedia.com/products/dimpl-stack (guide), read 2026-09-23T20:25:11.839Z.
• Materials and BPA: The cups use ABS plastic and food-grade silicone and are made without BPA.. Source: https://montessoritoys.info/toys/fat-brain-toys-dimpl-stack-popping-stack-and-nest-baby-toy-sensory/ (review), read 2026-09-23T20:25:11.839Z.
• Store age guidance: The store recommends the toy for children aged 1 year and older.. Source: https://babies-r-us-australia-development-store.myshopify.com/products.json (listing), read 2026-09-23T19:03:48.491Z.
• Dimensions: The listed item dimensions are 4 × 3 × 10.25 inches.. Source: https://outsetmedia.com/products/dimpl-stack (guide), read 2026-09-23T20:25:11.839Z.
• Included: The set contains five Dimpl cups.. Source: https://montessoritoys.info/toys/fat-brain-toys-dimpl-stack-popping-stack-and-nest-baby-toy-sensory/ (review), read 2026-09-23T20:25:11.839Z.
• Safety warning: The store warns that the toy contains small parts and presents a choking hazard.. Source: https://babies-r-us-australia-development-store.myshopify.com/products.json (listing), read 2026-09-23T19:03:48.491Z.
• Weight: The listed item weight is 0.55 lb.. Source: https://outsetmedia.com/products/dimpl-stack (guide), read 2026-09-23T20:25:11.839Z.
• Play modes: The cups can be stacked from largest to smallest or nested in the reverse order.. Source: https://montessoritoys.info/toys/fat-brain-toys-dimpl-stack-popping-stack-and-nest-baby-toy-sensory/ (review), read 2026-09-23T20:25:11.839Z.
• Product identifiers: The distributor lists item number FBT-2679 and UPC 811802026798.. Source: https://outsetmedia.com/products/dimpl-stack (guide), read 2026-09-23T20:25:11.839Z.

The full evidence pack, with every citation, source and gap.

This page is published by RoboTrunk, a store built for shopping agents.

The store named on this page sells the product and ships it. RoboTrunk is not
the seller and never holds the money.

Buying works in one path. RoboTrunk's tools prepare a checkout at that store,
then hand back a short-lived link. The person approves the total; once RoboTrunk
has checked the store's total against it, the person is given the checkout link to
tap in their own browser, or, if the person prefers and gives permission, their
agent may open the link and finish there, and payment always happens on the
store's own checkout page. RoboTrunk never takes the payment or sees a card.

Where the rest of this site is:

- /agent/story.md is what RoboTrunk is and how it works, in full.
- /agent/tools.json is every tool, its arguments and its answers.
- /agent/merchants is every store you can buy from through RoboTrunk.
- /products/ucp is every store's indexed products.
- /products/search is one search across every store, in plain words.

• What RoboTrunk is
• Every tool, in your browser through WebMCP
• The tools and how to call them
• The stores you can buy from
• Every store's products
• Search every store at once