Terms of Sale
Last updated: October 13, 2026.
1. Scope and acceptance
These terms govern the sale of the Mnemosyne OS, Infinity Edition license ("the License"). The License is a software license whose title of ownership, the Engramm, is recorded on a public registry (the Base ledger). The sale takes place inside the Mnemosyne OS application, from the customer's own wallet. The mnemosyne-os.io site presents the offer and processes no purchase. Placing an order constitutes full acceptance of these terms, confirmed in the app at purchase by a dedicated confirmation step. These terms also govern the sale of the cloud Credits ("the Credits"), a product distinct from the License.
2. Seller
XPACEGEMS LLC is a limited liability company organized under the laws of the State of Florida. Its principal address is 2932 NW 72 Ave, Miami, FL 33122, USA. It is registered with the State of Florida under document number L25000512310. Contact: dev@mnemosyne-os.io.
3. Product
Mnemosyne OS is local-first software: it installs and runs on the customer's machine, and the customer keeps their data at home. Downloading the personal edition and using it for personal purposes are free. The License unlocks the reserved features and cartridges of the Infinity edition, for life, with no subscription. The seller hosts none of the customer's data and has no access to their memory.
4. Price
The License is sold for 70 US dollars, one-time, all taxes included where applicable. The displayed price is the final price paid by the customer, with no surcharge added. This is not a subscription and entails no recurring payment.
5. Payment
The purchase is started from the application, which opens a secure payment page in the customer's browser. Payment is by card, processed by Stripe, Inc. The seller never has access to the customer's card details. The seller does not collect payment on its website.
6. Delivery
The License is delivered by minting the Engramm to the customer's wallet. The application creates that wallet locally and supplies its address at purchase. The customer then has no address to type. Delivery takes place after payment verification, within 24 hours under normal conditions. The customer sees the License appear in the app. The customer is solely responsible for keeping the keys and backup of that wallet. Delivery to the address supplied by the application constitutes conforming delivery.
7. Right of withdrawal
The License is digital content supplied without a physical medium, whose performance begins upon delivery. In line with EU consumer law on immediately-supplied digital content (art. L221-28, 13° of the French Consumer Code for French consumers), the customer expressly requests immediate performance and acknowledges waiving their right of withdrawal once the License is delivered. That consent is gathered in the app, before payment, through a mandatory confirmation. An Engramm issued on-chain cannot be revoked. As long as the License has not been delivered, the customer may cancel by simple email. Sums received are then refunded.
8. Cloud Credits
Cloud Credits ("the Credits") are a prepaid balance denominated in US dollars. They let the customer use remote AI models through the seller's server without supplying an API key of their own. They are a separate product. They are not required to use Mnemosyne OS and they are not included in the License. Buying them does not require the License.
Price and delivery. Credits are sold in packs of 10, 25 or 50 US dollars. The amount paid is credited at parity to the customer's balance: 10 dollars paid gives 10 dollars of balance. The balance is credited as soon as the payment processor confirms the payment, with no human step in between.
Consumption. The balance is spent in use, request by request, according to the number of tokens processed by the model called. The rate applied is set by the seller and includes the seller's margin: it is higher than the underlying inference provider's own rate. The customer can see their balance and usage history in the application at any time.
Term and transferability. Credits do not expire. They are attached to the customer's wallet and may not be assigned, resold, or converted back into money.
Right of withdrawal. Credits are digital content supplied without a physical medium. The customer waives the right of withdrawal for the portion of the balance actually consumed. Any unconsumed portion remains refundable on request by email within fourteen days of purchase.
Availability. The inference service relies on a third-party provider. The seller may change the list of models offered. If the seller discontinues the service, the unconsumed balance is refunded. In case of abuse (bypassing the meter, reselling access, unlawful activity), the seller may suspend access. The unconsumed balance remains refundable.
9. Nature and scope of the License
The License is personal, perpetual and non-exclusive. It entitles its holder to activate the Infinity edition on their own machines. It is attached to its title, the Engramm. Transferring the title transfers the License: the new holder becomes the licensee, and the previous one loses activation. The total number of licenses is capped at 50,000. That limit is written into the public registry, and anyone can verify it.
Professional use. The customer may use Mnemosyne OS in their professional activity, including to serve their own clients, and may sell what they create with it. They may sell installation, configuration, training and support services, provided each of their clients installs the software from the official sources, on their own devices, and accepts the license agreement themselves. They may not host Mnemosyne OS on a server that others access, nor distribute it under another brand.
10. What the License is not
The Engramm is a software license title. It is neither a financial instrument, nor an investment, nor a promise of future value. The seller makes no promotion of any exchange value of the token.
11. Warranties
The software is provided "as is". The seller strives to maintain and improve it, without any obligation as to future features. Mandatory statutory warranties applicable to consumers, notably the EU legal guarantee of conformity for digital content and services, remain fully applicable. Support is provided by email.
12. Liability
The software is local-first, so the customer is solely responsible for their backups, both of their data and of their wallet keys. Losing the keys of the wallet holding the Engramm entails losing access to the License, with no recourse against the seller. To the extent permitted by applicable law, the seller's total liability is capped at the amount actually paid for the License. Nothing herein excludes liability that cannot lawfully be excluded.
13. Public registry, publicity and immutability
The customer acknowledges that the delivery address and the recording of the Engramm appear on a public registry, viewable by anyone and immutable. Nobody can modify or erase these records, including the seller.
14. Governing law and disputes
These terms are governed by the laws of the State of Florida (USA). The mandatory consumer protections of the customer's country of residence prevail. EU consumers may use the European online dispute resolution platform (ec.europa.eu/consumers/odr). French consumers may also refer to a consumer mediator [to be designated]. The seller looks for an amicable resolution first: dev@mnemosyne-os.io.
15. YouTube features
The application can connect to YouTube through the YouTube API Services. By using these features you agree to be bound by the YouTube Terms of Service. Google's handling of your data is described in the Google Privacy Policy, and ours in our privacy policy. Replies to comments and video uploads are sent only by your own action in the application.
16. Contact
For any question about an order, write to dev@mnemosyne-os.io. Include the payment receipt sent by Stripe: it is your proof of purchase.