Terms

Terms of use

The rules of the tank are on How it works. This page is the contract around them. Last updated 2026-09-05; the site has been live since 2026-08-22.

Who you are dealing with

KOD.AI, Warsaw, Poland
info@kodai.com.pl

The service

Bubble Tank sells ad space in one tank under a Harberger tax: you set your bubble's price, you pay tax on that price, and anyone can buy it from you at it.
Games on the site are free and need no account. An account stores your scores and your credits.
We do not promise uptime, a number of visitors, or any result from your bubble. Click counts are the only audience figure we publish.

Your account

Signing in is by a link emailed to your address; there is no password. Anyone with access to that inbox can use the account, so keep it yours.
One person, one account. We can close an account that is used to abuse the tank, and we say why when we do.
What we email you. The sign-in link, and nothing else. We do not email you when someone opens a buyout on your bubble, when the daily tax is settled, or when a bubble pops for running out of credits. The clock on a buyout runs whether or not you have seen it. Your bubbles, any buyout against them and the number of days your credits still cover are on your tank page; keeping an eye on them is your job, not ours. If that changes we will say so here.

Credits and payment

Credits are prepaid and worth $1 each. They pay for minting, tax, buyouts and defense fees; sale proceeds and defense fees arrive as credits.
Payment is taken by Polar, our merchant of record. Polar is the seller on the payment, collects and remits any sales tax or VAT, and issues your invoice. Your card details never reach our servers.
Refunds. Credits are non-refundable and cannot be withdrawn as cash. Once credits are in your account they are spendable on the tank and nothing else. If a payment looks wrong — a double charge, a charge you did not make — write to info@kodai.com.pl within 14 days and we will check it and, where the payment was in error, ask Polar to reverse it.
Credits from play. Raising your personal best in a skill game also pays credits, at grinder rates and capped at $0.50 a day per account; games of chance never do. Earned credits are spendable like any other and equally non-refundable.
Tax you have already paid is not refunded when a bubble pops or is bought out. Funds locked in a buyout offer are returned if the offer does not complete.
Taking a bubble down. You may end your own placement at any time from the bubble's panel. The bubble pops immediately and the space returns to the tank. Nothing is refunded: not the tax already paid, and not an eternal premium, which is forfeited. A bubble with a buyout pending cannot be taken down — defend it or let the sale complete first.
Eternal bubbles. You may pay 20 weeks of a bubble's tax, once, to exempt that bubble from tax permanently — 20% of its price where the 1% weekly rate applies, and $14.00 at prices where the $0.10-a-day minimum does, which is why eternity needs a price of at least $14.00. The exemption attaches to the bubble, not to your account: it survives a sale and passes to whoever holds the bubble next. It does not exempt the bubble from buyout — anyone may still buy it at its price — and raising the price later costs eternity at the new price less whatever you have already paid for eternity on that bubble. The payment is a credit spend and is not refundable, including if you later sell the bubble or we pop it for breaking the content rules. “Permanently” means for as long as we run the tank; if we close the service we will say so at least 30 days ahead on this site.

What you may advertise

Product sites, personal sites and social profiles. No adult content, scams, malware, hate, or anything illegal in Poland or the EU.
You must have the right to the name, logo and link you upload. You keep ownership of them and give us permission to show them in the tank and in the games while the bubble is live.
We can pop a bubble that breaks these rules. Credits already spent on tax are not refunded; funds locked in offers are.

Money we make

Tax (1% of your price per week, minimum $0.10 a day, billed in whole cents with the fraction carried to the next settlement, so the total never exceeds that rate), a 10% rake on completed buyouts, and the one-time eternal premium above. That is the whole business model.

Law and changes

Polish law applies. If you are a consumer, the protections of your own country's law still apply to you.
When these terms change we update this page and the date at the top. Bubbles already live are billed at the tax rate and buyout rake published here; if we change either we will say so on this page at least 30 days ahead, and the new figure then applies to every bubble. The price of an optional upgrade such as eternity is whatever this page states at the moment you buy it.
Questions: info@kodai.com.pl.