AI assistants for online sellers: real fee math, with its sources
By Felix S. Pavel · Published · Figures checked · 6 min read
Key takeaways
- An AI assistant connected to our free tools works fee and profit questions out with fixed formulas, instead of recalling rates from what it learned.
- Every answer names the date its rates were checked and links the platform's own fee page, so you can check it yourself in one click.
- About one business in five used AI in early 2026, by the Census Bureau survey the Minneapolis Fed reports, with small firms behind large ones.
- A bookkeeper or accountant still keeps your books and answers tax questions; the tools give quick estimates at the numbers you give them.
An AI assistant can now do a seller's fee and profit sums properly, if it has the right tools. Connected to our free tools, Claude, ChatGPT and other assistants send your numbers to the same calculators this website uses, and read back an answer worked out with fixed formulas on each platform's published, dated fees, with the sources attached.
Below: what that looks like in a chat, what you can ask, where small businesses and AI are heading, and how it compares with the usual ways of getting the same answer.
What changes when an assistant has tools
On its own, an assistant answers from what it learned when it was trained. Fees change: Etsy's fee policy we use was last updated on October 5, 2026, for example. A rate remembered from training can be out of date, and even with the right rate, a model doing arithmetic in its head can slip.
A tool changes the job. The assistant's part becomes understanding your question and picking the right calculator. The calculator does the sum, the same way every time, and says which rates it used and when they were checked. Here is one question, start to finish.
One question, one tool call
You
I sell a $30 item on Etsy and the buyer pays $5 shipping. How much does Etsy take?
Your assistant calls a free tool
sellerprofit_etsy_fees(itemPrice: 30, shippingCharged: 5)
The tool answers, word for word
On a $35.00 order (item $30.00 + shipping $5.00), Etsy takes $3.78, 10.8% of the order: listing $0.20, transaction $2.28, processing $1.30. About $31.22 is left before materials, packaging, the label and ads.
Etsy fees as of October 5, 2026 (Fees & Payments Policy) and July 31, 2026 (Payments Policy), checked October 13, 2026.
Fixed formulas; no AI computes a number.
Nothing in that reply is the assistant's own arithmetic. Ask the same question tomorrow and you get the same figures, until a platform changes its fees and we update the tables on the fee rates page.
What you can ask
The free server has 16 tools. You don't need their names; you ask in your own words and the assistant picks. A few questions they answer:
- What Etsy, Shopify or Amazon takes from one sale, line by line, or all three side by side.
- Whether the buyer's shipping charge covers your label, and what to charge if it doesn't.
- The price that leaves you a target profit after fees.
- Whether a holiday discount pays, and how many extra orders it needs.
- The ad return at which Etsy Ads, Facebook, Instagram, Google or Amazon ads break even for an item.
- Which Shopify plan fits your monthly sales.
- The whole profit check-up: a grade, a monthly receipt and your biggest losses, each with its fix.
Where small businesses and AI are heading
AI use in business is growing, unevenly. The Minneapolis Fed, reading the Census Bureau's Business Trends and Outlook Survey, reports that about 10% of businesses used AI to make their goods or services in late 2025. The survey then widened its question to AI used in any part of the business, and in early 2026 the share was 20%, so the two figures measure different things. The gap by size is plain: in April 2026, 17% of firms with fewer than 20 employees used AI, against 30% of firms with 250 or more.
The way assistants reach outside tools is settling on one standard. Anthropic introduced the Model Context Protocol, MCP, in November 2024. In December 2025 it was given to the Agentic AI Foundation, a directed fund under the Linux Foundation co-founded by Anthropic, Block and OpenAI, with support from Google, Microsoft, AWS, Cloudflare and Bloomberg. The same post counts 10,000 active MCP servers and names ChatGPT, Claude, Cursor, Gemini, Microsoft Copilot and Visual Studio Code among the apps that support it. That is why one address works in several assistants.
Platforms are building assistants into their own tools too. Shopify's October 1, 2026 Canvas announcement describes Sidekick, which it calls Shopify's AI agent, building and editing a store with the merchant in a chat. For a small shop, the practical change is this: the help that used to need a specialist, or an evening with a spreadsheet, can be one question away, as long as the answer rests on real rules and real sums.
How fast you can get a sourced answer
The usual way to answer "what does Etsy take from this sale" is to open the fee policy, find the listing, transaction and processing rates, check whether Offsite Ads applies, and add it all up. With a connected assistant it is one sentence, and the reply arrives with the policy's date and a link to it, so checking it is one click rather than a search.
The answers stay current because the tables do. Each rate on the fee rates page has its source, its date and when we last checked it, and the tools read the same tables as the website. Every 10 minutes the site also connects to the server the way an assistant does and checks that a known question gets the right answer; the AI assistants page shows that check live.
The usual way and this way, side by side
| The job | The usual way | With an assistant and our free tools |
|---|---|---|
| Fees on one sale | Read the platform's fee pages and add each rate up by hand or in a spreadsheet | Ask in a sentence; get each fee, the total and the dated source |
| Whether shipping, a discount or an ad pays | Work out the break-even yourself, or ask someone who can | Ask; the tool works it out at your numbers |
| Where the month's money goes | Keep a spreadsheet, or have a bookkeeper keep the books | Run the free check-up: a grade, a monthly receipt and your biggest losses |
| Keeping rates current | Notice when a platform changes its fees and re-read the policy | Each answer says when its rates were checked and links the source |
| What it costs | Your own time, or a bookkeeper's: a median wage of $24.36 an hour for bookkeeping clerks and $40.23 for accountants | Free, with no account, sign-in or key |
What a bookkeeper or accountant still does better
The tools don't replace the people who keep your records. They work from the numbers you give them, they don't see your bank account or your real orders, and their answers are estimates, not tax or legal advice.
- A bookkeeper keeps the record of every sale and expense that your taxes rest on.
- An accountant answers tax questions for your situation and can prepare your return.
- Both can spot things in your real records that a quick calculation never sees.
What the tools are good at is the quick question in between: is this price right, does this ad pay, what did that fee change cost me. For how the two kinds of help differ, see bookkeeping software or a profit check-up.
What stays the same: check what matters
An assistant can still misread your question or summarize an answer loosely. The tool's own words are the record: if a figure matters, ask the assistant to show the tool's reply, or run the same sum on the matching calculator page. Every tool reply includes that page's link.
Privacy is simple because there is little to keep. The tools take numbers only. What your assistant sends is used to work out the answer and then dropped; we count how many times each tool ran each day, and nothing else.
How to connect it
- Open the AI assistants page and copy the server address.
- In Claude, add it as a custom connector; in ChatGPT, create a connector with it. The page has the steps for each.
- Choose no sign-in, turn it on in a chat, and ask your question.
The server is also listed in the official MCP Registry, the GitHub MCP Registry and Glama; how our AI tools work shows every tool with a real answer. Prefer the website? The free check-up asks seven short questions, no login.
Sources
- Etsy Fees & Payments Policy (via the fee tool's sources) · Etsy · Last updated October 5, 2026; read October 22, 2026
- AI adoption in business grows steadily but unevenly · Federal Reserve Bank of Minneapolis · May 28, 2026
- Introducing the Model Context Protocol · Anthropic · November 25, 2024
- MCP joins the Agentic AI Foundation · Model Context Protocol blog · December 9, 2025
- Introducing Canvas: Opening the aperture on online store design · Shopify · October 1, 2026
- Bookkeeping, Accounting, and Auditing Clerks (Occupational Outlook Handbook) · US Bureau of Labor Statistics · May 2025 wage data; read October 22, 2026
- Accountants and Auditors (Occupational Outlook Handbook) · US Bureau of Labor Statistics · May 2025 wage data; read October 22, 2026
Money figures are worked out by the same engine as our calculators, at the fees checked on October 22, 2026. Platforms change their fees; every rule we use, with its source and date, is on the fee rates page.
How this post was made: drafted with AI help. Every figure and rule in it was checked against the sources above and worked out by the site’s own engine before it went up. Written by Felix S. Pavel.
