Your contract with a marketplace is an offer agreement that the platform changes unilaterally: if you kept working after the update, you accepted the new version. Commissions, fines, and the rules for goods acceptance and settlements are rewritten regularly, and "I did not know" does not work — a change you missed surfaces as a deduction in your report. Here is how to track the offer agreement without a lawyer on staff.
How the mechanism works

- Unilateral changes with notice (a news item in the seller account, an email) and an effective date. The gap between the announcement and the effective date is often short.
- Acceptance by conduct: continuing to ship or sell after that date equals consent. There is no formal signature.
- A pile of documents, not one: the offer agreement itself plus annexes, regulations and tariffs — they change separately and on different dates. A tariff can "move" without any change to the main text.
Which changes hit your money
From experience, read these first:
- Commissions and tariffs — category percentages, logistics, storage, goods acceptance: the commission structure. A shift of 2–3 percentage points rewrites the unit economics of whole categories.
- Fines and deductions — new categories of violation and new amounts: the deduction classifier.
- Goods acceptance and logistics rules — packaging, labeling, slots: fine yesterday, a violation today: packaging requirements.
- Settlements and payouts — schedules, the order of deductions, offsets.
- Content and promotion rules — what is allowed in a card, the rules for promotions and prices.
Monitoring: a 20-minute weekly routine

- Official sources once a week: the news feeds in both seller accounts — everything legally significant is published there.
- Telegram channels and seller communities — fast alerts and analysis of the consequences; but base your decision on the primary source, not on a retelling.
- A date trigger in your calendar: when you see an announcement, set a reminder for the effective date with a note saying "check the impact on my SKUs".
- Recalculate on tariff changes: put the new rates straight into your pricing model: price calculation.
- An archive of versions: in a dispute what matters is which version was in force on the date of the event — save PDFs of the key documents whenever they change. Marketplaces keep the history, but your own copy is faster and more reliable: the basis for a challenge.
If the new terms are unacceptable

The real options: rebuild your economics (prices, assortment, fulfillment model), move volume to another marketplace (migrating cards), or exit the category. Challenging the offer agreement itself is practically impossible; what you can challenge is the application of its rules to specific situations. Collective pressure from sellers through communities and publicity does sometimes roll back the most egregious changes — but you cannot plan a business on that.
The latest changes are covered in the news piece on the new Wildberries offer agreement.
FAQ
"Can a marketplace change the contract without my consent?" Yes, because it is an offer agreement: the platform publishes the changes with an effective date, and continuing to work means consent. The seller's defense is monitoring the announcements and adapting the economics quickly.
"Where do I look for changes to the Wildberries and Ozon offer agreements?" In the official news of the seller account — everything legally significant is there. Seller communities and channels speed up the alert, but always check the primary source.
"What do I do if I missed a change and got fined?" Check which version was in force on the date of the violation and whether it was published correctly. Arguing that you were unaware is pointless; arguing that the rule was applied incorrectly is possible.
"How often do the terms change?" Regularly: tariffs and regulations several times a year, individual rules more often. A weekly check of the seller account news closes the risk.
"Is it worth keeping old versions of the offer agreement?" Yes: in a dispute the deciding factor is the version in force on the date of the event. Save a PDF at every key change — your own dated copy is always at hand.




