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Terms of Service

Last updated: 12 May 2026 · Effective from: 12 May 2026

1. Agreement

These Terms of Service ("Terms") govern your access to and use of the SellerEngine website (sellerengine.app) and the SellerEngine tools — Sniper HUB, Stock Control, and PricePricer (collectively, the "Services"), operated by POLARSTAR OÜ, an Estonian private limited company located at Kesklinna linnaosa, Tornimäe tn 5, 10145 Tallinn, Estonia ("SellerEngine", "we", "us", or "our").

By creating an account, connecting your Amazon Ads account, or otherwise using the Services, you ("you" or "Customer") agree to these Terms. If you do not agree, do not use the Services.

2. Eligibility

To use the Services you must:

  • Be at least 18 years old.
  • Have the legal authority to bind the business whose Amazon account you connect (i.e. you own it, or you are authorized by the owner).
  • Comply with Amazon's terms, including the Amazon Advertising API License Agreement.

3. Description of the Services

3.1 What the Services do

The Services let you:

  • Read your Amazon Ads performance data via the Amazon Ads API.
  • Analyse that data with our heuristics (e.g. waste detection, keyword harvest opportunities, bid optimization, stock coverage, price suggestions).
  • Execute write actions on Amazon — such as bid changes, negative keywords, harvested keywords, and product targets — when and only when you explicitly approve the action through the UI.

3.2 What the Services do NOT do

  • We do not place orders, send payments, change your bank details, or alter your Amazon account credentials.
  • We do not run automated changes on a schedule without your explicit per-action consent.
  • We do not guarantee any specific business outcome (e.g. higher revenue, lower ACoS, better organic ranking). The Services are a decision-support tool; you remain in control and responsible for the decisions you accept.

4. Your account and authorization

  • You are responsible for keeping your SellerEngine credentials secure and for any activity that happens under your account.
  • When you connect your Amazon Ads account via Login with Amazon, you grant SellerEngine the scopes necessary to read advertising data and execute write actions on your behalf. You can revoke this access at any time from your Amazon account or by deleting your SellerEngine account (see Privacy Policy, §7).
  • You agree not to share your account, transfer it, or let third parties use it on your behalf without our written consent.

5. Acceptable use

You agree NOT to:

  • Use the Services to violate Amazon's policies or applicable law.
  • Reverse engineer, decompile, or attempt to extract the source code of the Services (beyond what local applicable law expressly permits).
  • Scrape, mirror, or systematically download data beyond what the normal use of the Services requires.
  • Interfere with the security or integrity of the Services, including probing, scanning, or testing vulnerabilities without our written consent.
  • Use the Services on behalf of an Amazon account you do not own or are not authorized to operate.
  • Resell or sublicense the Services to third parties without a separate agreement with us.

6. Fees and billing

During the private beta, the Services are provided at no cost. We will give you at least 30 days' notice via email before introducing paid plans.

Once paid plans are available:

  • Subscription fees will be billed in advance for the period chosen (monthly or annual).
  • Fees are non-refundable except where required by applicable law.
  • You authorize us to charge your selected payment method until you cancel the subscription.
  • We may change pricing with 30 days' notice; changes apply at the next renewal.

7. Intellectual property

All intellectual property in the Services — including the software, algorithms, UI, documentation, and branding — belongs to POLARSTAR OÜ or its licensors. The Services are licensed, not sold, to you.

Your data remains yours. You retain all rights in the advertising data, business data, and content you input into or generate through the Services. You grant us a limited, non-exclusive license to process that data solely to provide and improve the Services (see Privacy Policy for details).

8. Disclaimers

The Services are provided "as is" and "as available". To the maximum extent permitted by applicable law, SellerEngine disclaims all warranties, whether express or implied, including warranties of merchantability, fitness for a particular purpose, non-infringement, and uninterrupted operation.

Specifically:

  • We do not warrant that the Services will produce any specific advertising or business result.
  • We do not warrant that the Amazon Ads API will be available, accurate, or behave consistently — Amazon controls that API.
  • You acknowledge that automated and semi-automated PPC operations carry inherent risk and that you remain the decision-maker.

9. Limitation of liability

To the maximum extent permitted by applicable law:

  • SellerEngine's total aggregate liability arising out of or related to these Terms is limited to the fees you paid us in the 12 months preceding the event giving rise to liability, or €100 if higher.
  • We are not liable for indirect, incidental, special, consequential, or punitive damages — including lost profits, lost revenue, lost ad spend, lost goodwill, or loss of data — even if we have been advised of the possibility.
  • Nothing in these Terms limits liability that cannot be limited by applicable law (e.g. liability for fraud, willful misconduct, or mandatory consumer protection rights).

10. Indemnification

You agree to defend, indemnify, and hold harmless POLARSTAR OÜ, its affiliates, officers, and employees from any claim, demand, loss, or expense (including reasonable legal fees) arising out of your use of the Services in violation of these Terms or applicable law, including Amazon's policies.

11. Termination

  • By you: you may stop using the Services and delete your account at any time via the account settings or by emailing hello@sellerengine.app.
  • By us: we may suspend or terminate your access if you materially breach these Terms, abuse the Services, or use them in a way that puts us, other customers, or third parties at risk. Where practicable, we will give notice and an opportunity to cure.
  • Upon termination, sections 7 (IP), 8 (Disclaimers), 9 (Liability), 10 (Indemnification), and 14 (Governing law) survive.

12. Modifications to the Services and these Terms

We may add, change, or remove features at any time. If a change materially reduces functionality or your rights, we will notify you with at least 14 days' notice.

We may update these Terms periodically. Material changes will be notified by email at least 14 days before taking effect. Continued use of the Services after the effective date means you accept the updated Terms.

13. Third-party platforms

The Services rely on third-party platforms — most notably the Amazon Ads API. Your use of those platforms is governed by their respective terms (e.g. the Amazon Advertising API License Agreement and the Amazon Services Business Solutions Agreement). You are responsible for complying with them. If a third party suspends, deprecates, or changes their service in a way that impacts SellerEngine, we will do our best to adapt but cannot guarantee uninterrupted functionality.

14. Governing law and disputes

These Terms are governed by the laws of Estonia, without regard to its conflict-of-law rules. The exclusive jurisdiction for disputes arising out of or related to these Terms or the Services is the courts of Tallinn, Estonia, unless mandatory consumer protection rules in your country grant you the right to bring suit elsewhere.

15. Miscellaneous

  • Entire agreement: these Terms and the Privacy Policy form the entire agreement between you and SellerEngine regarding the Services.
  • Severability: if any provision is found unenforceable, the remaining provisions stay in effect.
  • No waiver: our failure to enforce a right is not a waiver of that right.
  • Assignment: you may not assign these Terms without our consent. We may assign them in connection with a merger, acquisition, or sale of assets.
  • Notices: notices to you may be sent to the email associated with your account; notices to us must be sent to legal@sellerengine.app.

16. Contact

Questions about these Terms:
Email legal@sellerengine.app
Postal: POLARSTAR OÜ — Kesklinna linnaosa, Tornimäe tn 5, 10145 Tallinn, Estonia