MuseLife adminPersonal assistantAI score · 75/100AI-assisted edit · no obvious prompt-injection riskX

First AI-Agent Shopping with Muse: Cheapest Sparkling Water on Rakuten, ¥422 Less Than Amazon

Enter shopping request → Muse compares prices and attempts logins across platforms → human verifies payment before order completion

BeginnerStepsTip
Who
Users who want to try AI-assisted shopping for daily consumables and are willing to supervise the payment step
You get
Purchased 48 bottles of strong sparkling water on Rakuten Ichiba for ¥2,780, ¥422 cheaper than the usual Amazon purchase
You need
Muse

Constraints

Requires access to the Muse AI agent; at least one registered e-commerce account with saved login credentials (author used Rakuten); payment card must be valid on the platform side. Author spent approximately 55 minutes for the first end-to-end run.

What they did

Author torutanji used the Muse AI agent for online shopping for the first time. With Amazon blocked from Muse's browser and Yodobashi login failing, the author successfully purchased 48 bottles of strong sparkling water on Rakuten Ichiba for ¥2,780 using saved login credentials. During the process, Muse mistakenly selected a payment card, which the author caught and corrected manually.

How it went

The purchase was ¥422 cheaper than the usual Amazon price (¥3,202). Rakuten login took ~3 minutes, Yodobashi attempt ~16 minutes, total time ~55 minutes. The author explicitly states this was not a fully AI-automated success, documenting successes, blockers, and errors as they happened (author_report).

Worth knowing

Amazon blocking may vary by environment; Yodobashi login failure cause was not confirmed; updating payment card details required manual action in the author's local browser, as Muse cannot directly operate the user's device. This site has not tested the workflow: reproduction=not_tested.

Steps

  1. Check which platforms are accessible

    Ask Muse to shop, while verifying whether usual platforms work. The author found Amazon blocked (3 attempts all showed error pages), Yodobashi login denied (Access Denied, ~16 minutes spent), and Rakuten succeeded in ~3 minutes using saved credentials.

  2. Specify product and compare prices

    Tell Muse the exact product (author: 500ml label-less strong sparkling water, case purchase) and provide a reference page from usual buying. Request comparison under uniform conditions (author: 48 bottles including shipping). After Muse returns quotes, ask it to record the findings and proceed to purchase.

  3. Manually verify payment details

    Before Muse finalizes payment, actively check the selected payment method. The author found Muse had mistakenly chosen a JCB card that appeared expired due to cached info; the intended VISA card required the author to update its expiry date manually in their own browser. After confirming the correct card and expiry on the payment page, the author authorized the transaction.

  4. Confirm order details

    Verify order specifics: product, store, total, payment method, shipping. Author's order—Product: Izmick SODA label-less strong sparkling water 500ml × 24 bottles × 2 cases (48 bottles); Store: Izmick World (Rakuten Ichiba); Total: ¥2,780 (tax included, free shipping); Payment: VISA ****0001, one-time charge; Estimated shipping within 1-3 days.

  5. Document lessons and limitations

    The author summarized three points: ① The biggest bottleneck for AI shopping is finding platforms that allow login, not the price comparison itself; ② Payment is irreversible, so human verification before final confirmation is essential; ③ Price comparison saves effort but requires ongoing supervision—full delegation is not viable.

Prompt you can copy

Reference prompt · Editorial suggestion。Confirm the destination, input variables and output format before use.

This block is the prompt. Ads are never placed here.

No prompt needed — just follow the steps.

Source

Muse で初ネット通販：楽天最安炭酸水・Amazon ブロック・支払いカード取り違えを止めた記録 · torutanji · X · 2026-10-31T03:19:40.000Z

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