About
About Seller Tools Index
A public record for Amazon and marketplace sellers: what the software costs, what changed, what an AI agent can do in your account and who owns the tools you pay for.
Last updated
Why this exists
Most lists of seller tools are written to sell them. Prices are copied once and never checked again, rankings follow commissions, and a plan that quietly lost a feature still reads as a bargain. If you run a seller business on six or eight subscriptions, you notice the changes on your card statement, not on the pricing page.
We think the answer is a record, not another review. A page that keeps the receipts: archived pricing pages, dated changes, Amazon's own announcements, and the code of the agents that ask for access to your account.
What you get here
- A change log of pricing pages, plans and features, each entry linked to the archived page it came from.
- Price histories built from 297 archived pricing pages so far, going back to 2023.
- An SP-API watch that follows Amazon's deprecations, removals and new APIs, because those changes reach your tools before they reach you.
- MCP inspections of 97 servers that connect AI agents to seller and ads accounts, with every tool marked read or write and the basis for that mark.
- The STI Cost Index, a single measure of where seller software prices are heading, once enough prices are verified to publish it honestly.
Who publishes it
Seller Tools Index is published by Kayumari Consulting LLC, a consulting company in Fort Lauderdale, Florida, that works with Amazon sellers on listings, advertising and automation. Data collection runs on our own scripts. Every figure that appears as a fact has been checked against its source, with the quoted evidence; these checks are done by our research agent and spot-checked by the editor; everything else is labelled as machine-read or not verified.
The editor is Steffen Hartmann, who works with Amazon sellers on listings, advertising and AI automation. He spot-checks the verified figures and is responsible for what this site publishes.
We are not affiliated with Amazon, and no vendor listed here owns, funds or reviews this site.
Independence
The site is paid for by affiliate commissions. The rules that keep that money away from the data are on How we earn money. The way we collect and check data is on Methodology.
Contact
Tips, corrections and questions: info@sellertoolsindex.com. If you work at a vendor and a figure is wrong, send the source and we will fix it. Postal address and legal details are in the imprint.