Terms of Service — SULLA (sulla.work)
Effective date: 25 August 2026
These Terms govern the use of the SULLA service — an API that lets you add an AI assistant to your product ("the Service") — and purchases of prepaid credits on sulla.work.
1. Who provides the Service
Ing. Andrej Arťuchov, a sole trader (OSVČ) registered in the Czech Republic, Business ID (IČO) 05846757, registered office Přemyslovská 1925/40, Žižkov, 130 00 Praha 3, Czech Republic ("we", "us").
Contact: support@sulla.work.
2. Definitions
- Credit — the prepaid unit of payment for the Service. 1 credit = USD 0.01 (one US cent).
- Assistant — an AI assistant you configure in your account: its topic, tone, and refusal rules.
- API key — the secret key issued per assistant, used to call the Service.
- Published rates — the per-model prices in credits per 1,000 input and output tokens, published on sulla.work and in your account.
- Consumer — a natural person who enters into this contract outside the scope of their trade, business, or profession.
3. The Service
3.1. You describe your assistant in your account, receive an API key, and call the Service over HTTP (POST /v1/chat). Replies stream back to your application.
3.2. The assistant answers within the topic you define and politely declines off-topic questions. A declined reply is still a metered reply (see 5.4).
3.3. AI-generated content is probabilistic. We do not warrant that any individual reply is accurate, complete, or fit for a particular purpose; you are responsible for how replies are used in your product (see 8).
3.4. Model inference is performed by third-party AI model providers (at launch: OpenAI; default model gpt-5.4-mini). We manage the provider relationship, keys, and upgrades. We may add, replace, or retire models; the models currently offered and their published rates are always listed in your account.
4. Account and API keys
4.1. You must provide accurate registration data and keep it current. You are responsible for everything done under your account and API keys.
4.2. Keep API keys confidential. You can issue, rotate, and revoke keys in your account; revoke a key immediately if you suspect it is compromised, and tell us at support@sulla.work.
4.3. The contract is concluded in English. These Terms as currently in force are available on this page; we recommend saving a copy at the time of purchase.
5. Credits, prices, and payment
5.1. The Service is prepaid. Top-up packages: USD 10, 50, or 100 — 1,000, 5,000, or 10,000 credits. Prices are stated in USD; payment is accepted by bank transfer in CZK, EUR, or USD. Credits are added when the transfer arrives. Card payments become available soon.
5.2. Each reply is metered by what the model actually reads and writes (tokens), at the published rate for the model you chose, at the time of the request. Rate changes never apply retroactively: usage already metered is never re-priced.
5.3. Credits are valid for 12 months from the day of the top-up; unused credits then expire. Expiry does not limit any statutory right you have as a consumer (see the Refund Policy).
5.4. Every reply is metered, including refusals of off-topic questions — the model still processed the request.
5.5. When your balance reaches zero, the Service stops answering. Nothing is billed beyond your prepaid balance; there is no negative balance and no automatic charge.
5.6. Taxes: we are not a VAT payer (neplátce DPH) under Czech law. Prices are final; no VAT is added.
6. Acceptable use
6.1. You must not use the Service to: violate law; infringe third-party rights; generate or process content that is illegal in the Czech Republic or in the jurisdiction where you offer your product; attempt to circumvent metering, safety mechanisms, or topic restrictions of assistants that are not yours; probe, disrupt, or overload the infrastructure; resell raw access to the underlying models outside your own product.
6.2. Use of the Service must also respect the acceptable-use requirements of the AI model providers whose models you select, as published by those providers.
6.3. You are responsible for what your application allows end users to submit and for how your product presents AI-generated replies.
7. Data processing on your behalf
7.1. Content that your application sends to the Service on behalf of your end users is processed by us as your processor under Art. 28 GDPR; you are the controller.
7.2. We process such content only to provide the Service (including sub-processing by the AI model provider and hosting listed in the Privacy Policy, section 4), and on no other instructions. We do not use it to train AI models and do not disclose it except as required by law.
7.3. We implement appropriate technical and organisational measures; persons processing the data are bound by confidentiality; customer accounts are separated from one another.
7.4. We will inform you of intended changes to the sub-processor list (by updating the Privacy Policy and, for account holders, by email), giving you the opportunity to object; if you object, you may terminate and be refunded your unused credits.
7.5. On account closure we delete end-user content processed on your behalf, except where law requires retention. On request we will assist you, to a reasonable extent, with data-subject requests and with demonstrating compliance.
7.6. If your use of the Service requires a signed data processing agreement, contact support@sulla.work.
8. Your product, your users
You are responsible for: informing your end users about the use of an AI assistant and about data processing in your product (your own privacy policy); obtaining any consents your product needs; ensuring your use of replies complies with the rules applicable to your industry. You will indemnify us against third-party claims arising from your product's use of the Service in breach of these Terms, to the extent permitted by law.
9. Availability
The Service is provided with reasonable skill and care, but without a guaranteed availability level (no SLA) at this stage. We may perform maintenance; where planned maintenance will interrupt the Service, we announce it in advance in your account. Your sole remedy for extended unavailability caused by us is termination and a refund of unused credits.
10. Suspension and termination
10.1. We may suspend or restrict the Service immediately if your use materially breaches section 6, threatens the integrity or security of the Service, or is required by law. We notify you and, where the cause can be cured, give you the opportunity to cure it.
10.2. You may close your account at any time. We may terminate with 30 days' notice by email.
10.3. On termination by us without cause, or by you following a sub-processor objection (7.4) or extended unavailability (9), we refund your unused credits. Other cases are governed by the Refund Policy. On termination for your material breach, statutory rules apply; we may set off damage caused by the breach.
11. Liability
11.1. To the extent permitted by law, our aggregate liability for damage caused by breach of these Terms is limited to the amount you paid for the Service in the 12 months preceding the event, and we are not liable for lost profits or other indirect damage.
11.2. Nothing in these Terms limits liability that cannot be limited under Czech law — in particular liability for damage caused intentionally or by gross negligence, or for harm to natural rights of a person (§ 2898 of the Czech Civil Code) — and nothing in these Terms limits the statutory rights of Consumers.
12. Changes to these Terms
We may amend these Terms to a reasonable extent (changes in law, in payment methods, in the model line-up, or in Service features). Account holders are notified by email at least 14 days before changes take effect and may terminate before that date; termination on these grounds entitles you to a refund of unused credits. Continued use after the effective date constitutes acceptance.
13. Governing law and disputes
13.1. These Terms are governed by the law of the Czech Republic. Disputes are resolved by the Czech courts. If you are a Consumer, this choice does not deprive you of the protection of mandatory provisions of the law of your habitual residence.
13.2. Out-of-court dispute resolution for Consumers: the body competent for out-of-court resolution of consumer disputes arising from these Terms is the Czech Trade Inspection Authority (Česká obchodní inspekce) — www.coi.cz, ADR details at adr.coi.cz. A Consumer may also complain directly to us at support@sulla.work; we will try to resolve the matter first.
13.3. Consumers' right of withdrawal from distance contracts, and all refund rules, are set out in the Refund Policy, which forms part of these Terms.
13.4. Language versions. These Terms and the related policies (Privacy Policy, Refund Policy, Cookie Notice, provider information) are published in English and in Czech. Both versions have the same meaning. In the event of a discrepancy, the Czech version prevails for Consumers with habitual residence in the Czech Republic; in all other cases the English version prevails.
This document was prepared as a good-faith disclosure based on a documented checklist. It is a working document of the site operator, not legal advice, and does not replace review by a qualified lawyer in your jurisdiction.