E-commerce · Do this yourself

Recheck Amazon sellers’ profit on every product after fee changes.

In short: an AI-agent-run business you oversee about an hour a week. Tools cost $30–$85/mo, agent setup is intermediate, and our estimate is 30 sellers × $39 = $1,170/mo.

How it makes money: Charge Amazon sellers $39/mo to recompute each product’s profit after fee changes and track reserve holds.

Agent setup: Intermediate · Connects several tools (Lovable, Supabase) with payments and simple data. How we rate this

Found on Reddit in r/FulfillmentByAmazon, r/ecommerce (2 threads).

🔥 4 posts this week · 0 likes

Based on u/Few-Friendship126 on Reddit (opens in new tab)

Where this came from (Reddit)

Fee changes and payout reserves quietly shrink margins, and sellers only notice at month-end.

The threads (in our words)

Reddit blocks automated reads, so we couldn’t record upvote or comment counts. The business below is our own design inspired by these threads.

Who it’s for

Amazon sellers with dozens to hundreds of products.

Adapt it to your industry

  • Start with one niche or customer type, then expand.
  • Ask your first 10 customers what they would pay before you build more.
  • Keep a human check on anything sent in a customer’s name.

Step by step

  1. Connect the seller’s account through Amazon’s official seller data access (read-only reports).
  2. Have the agent pull current fees per product and recompute profit after product cost, shipping and ads.
  3. Flag products that fell below the seller’s target margin and suggest a price or a pause.
  4. Track reserve holds and releases against delivered orders and show the cash still held.
  5. Charge a monthly plan per seller through Stripe.
  6. Send a weekly email: margin changes, products at risk and reserve balance.

Ready-to-copy prompt

Here is my product list with costs [paste] and Amazon’s fee preview report [paste]. Recompute profit per product, list the ones under 15% margin, and suggest a new price for each.

Start with AI

Opens the AI with this guide and the prompt filled in.

Open in ChatGPT (opens in new tab)Open in Claude (opens in new tab)Open in Grok (opens in new tab)
Time
1–3 hoursOur estimate

Your autonomous stack

Autonomy: The agent pulls fee and payout reports daily, recomputes profit per product and tracks reserve holds and releases. Your part: The seller approves any price change; you check data sync errors weekly (about 30 minutes).

Every layer an agent-run business needs, in order. Prices are public list prices, checked Oct 16, 2026.

  1. Agent (the brain): Grok Bot (agent + scheduled routines) (opens in new tab) (Included with The X Subscription Premium $30/mo (Super $100/mo for more usage; Plus $8 does not include Grok Bot)). Grok Bot runs the business day to day: writes, answers, decides small things and reports to you. Claude Code or Codex are alternatives.
  2. Build and hosting: Lovable (opens in new tab) (Free tier · Pro $25/mo), Supabase database (opens in new tab) (Free tier · Pro from $25/mo). The product or service your customers use.
  3. Payments: Stripe payments (opens in new tab) (No monthly fee · 2.9% + 30¢ per card payment). Automatic checkout and receipts. Other options: PayPal Checkout (3.49% + 49¢) or Lemon Squeezy (5% + 50¢, handles sales tax).
  4. Customer acquisition: Buffer (scheduled X posts) (opens in new tab) (Free plan (3 channels, 10 queued posts each) · Essentials $5/mo per channel, billed yearly), beehiiv newsletter (opens in new tab) (Free up to 2,500 subscribers). Agent-written SEO pages, scheduled X posts and a weekly newsletter.
  5. Delivery: Grok Bot (agent + scheduled routines) (opens in new tab) (Included with The X Subscription Premium $30/mo (Super $100/mo for more usage; Plus $8 does not include Grok Bot)). A Grok Bot routine delivers the product or result as soon as someone pays.
  6. Support: Grok Bot (agent + scheduled routines) (opens in new tab) (Included with The X Subscription Premium $30/mo (Super $100/mo for more usage; Plus $8 does not include Grok Bot)). Grok Bot answers the support inbox; anything unclear is flagged for you.
  7. Monitoring and schedule: Grok Bot (agent + scheduled routines) (opens in new tab) (Included with The X Subscription Premium $30/mo (Super $100/mo for more usage; Plus $8 does not include Grok Bot)). Grok Bot scheduled routines run each day: send, check for failures, alert you if something breaks.
  8. Analytics: Google Analytics (opens in new tab) (Free). Tracks visits, signups and sales so the agent can report what works.
  9. Human checkpoint: The seller approves any price change; you check data sync errors weekly (about 30 minutes).
  10. Price: charge $39 per seller (monthly plan per seller). Offer the first 3 customers a founding price for honest feedback.
Monthly cost$30–$85/monthFree tiers → paid plans of the tools above. Card fees come out of each sale.
What you could earn · EstimateEstimate: 30 sellers × $39 = $1,170/moOur estimate, not a fact or a promise. It’s simple math if you land these customers at this price.
Details: source, numbers and tags

What they did

An agent recomputes each product’s profit when Amazon fees change, flags the ones that now lose money, suggests new prices, and tracks how much of each payout is held in reserve. We designed this business from real Reddit threads; it is an idea for you to build, not a description of the posters’ businesses.

How it went

Found on Reddit in r/FulfillmentByAmazon, r/ecommerce (2 threads). Upvote and comment counts weren’t retrievable, so none are shown. On X, 4 posts matched our search for this idea in the 7 days to 2026-10-20.

Worth knowing

Use Amazon’s official data access only; the seller approves every price change; it is an estimate, not accounting advice.

Difficulty
BeginnerOur rating
Time to build
Not reportedOur estimate
Monthly cost
Not reported
Revenue
Not reportedWe only show revenue the source states
Engagement
No public countThe source shows no number
X buzz
4.9 · 4 posts in 7 days0 likes, 0 reposts, 0 replies, 0 quotes on 1 top posts · fetched Oct 20, 2026 · query: (Amazon OR FBA) ("fee increase" OR "fees went up" OR "new fees" OR "fee changes" OR "account level reserve" OR "account-level reserve") -is:retweet lang:en

Posted · Added Oct 20, 2026

Original builder recipe

  • ChatGPT
  • Claude
  1. Connect the seller’s account through Amazon’s official seller data access (read-only reports).
  2. Have the agent pull current fees per product and recompute profit after product cost, shipping and ads.
  3. Flag products that fell below the seller’s target margin and suggest a price or a pause.
  4. Track reserve holds and releases against delivered orders and show the cash still held.
  5. Charge a monthly plan per seller through Stripe.
  6. Send a weekly email: margin changes, products at risk and reserve balance.

Tags

Read the original

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