Terms of Service
Last updated: 28 September 2026
Version 2026-09-27. These Terms of Service ("Terms") govern the use of Jein (jein.dev), the hosted API at https://app.jein.dev and its dashboard (together the "Service"). The Service is provided by ("we", "us"):
Setorli Blagogee
c/o Autorenglück #40488
Albert-Einstein-Str. 47
02977 Hoyerswerda
Germany
E-mail: legal.jein@snblago.com
Phone: +49 173 4362355
1. Scope and eligibility
1.1 The Service is for developers. Anyone aged 18 or over may create an account, including for personal projects. If you sign up for a company or another organisation, you confirm that you are authorised to bind it. "Customer" or "you" means the person or organisation that holds the account.
1.2 These Terms apply exclusively. Your own terms and conditions do not apply, even if we do not object to them or perform without reservation, unless we agree to them in writing.
1.3 The Data Processing Agreement at https://jein.dev/dpa/ ("DPA") is part of these Terms and applies where you act as a controller under the GDPR. Our Privacy Policy at https://jein.dev/privacy/ explains how we process personal data as a controller, including request content for personal or household use.
1.4 Jein is independent of TypeSafe and of the Jev service. It is not affiliated with, endorsed by or operated by them. "Jev-compatible" only means that the Service accepts the same request format; model behaviour differs. Product names belong to their owners.
2. Contract and account
2.1 The contract is concluded when you complete the signup, accept these Terms and we create your account. We may decline a signup without giving reasons.
2.2 An account requires a valid e-mail address, which we use for login and for service messages (for example about changes to these Terms). Keep it current. Each account is for one Customer; you are responsible for all use of your account and your API keys.
2.3 To conclude the contract, enter your e-mail address and create your login with our identity provider, verify your e-mail address, then review the account e-mail shown on the signup page, tick the Terms checkbox and select "Create account". You can correct your entries before submitting them; on the signup page, "Use a different account" lets you change the login used. The contract is concluded when we create your account (section 2.1). We store the contract text and record which version of these Terms you accepted and when. You can save or print these Terms from the link on the signup page before accepting them; on request we tell you which version you accepted and send you its text. The current version is always available at https://jein.dev/terms/. The contract language is English. We do not subscribe to a code of conduct for this contract.
2.4 Login is provided through our identity provider (Auth0 by Okta). Keep your credentials confidential and tell us without undue delay at legal.jein@snblago.com if you suspect misuse.
3. The Service
3.1 The Service runs the open Laya model and returns choices, probabilities and scores for the text you send ("Input"); the result is the "Output". The current functions, models, limits and the API reference are described in the documentation at https://app.jein.dev/docs/. The documentation describes the Service; it is not a guarantee of any characteristic (Beschaffenheitsgarantie).
3.2 The Service is a preview. We may change, add or remove functions, models and limits for valid reasons: to improve performance or security, adapt to technical or legal requirements, or manage available capacity. Changes must be reasonable for you, preserve the essential purpose of API access to a hosted Laya model and impose no additional costs without your express agreement. We explain changes clearly. For a change that adversely affects access or use by more than a minor amount, we notify you at least 30 days in advance on a durable medium (for example by e-mail), stating the nature and date of the change and your right to terminate free of charge. You may terminate within 30 days after receiving that notice or after the change takes effect, whichever is later (§ 327r BGB); your right to end the contract at any time under section 13.2 remains. Changes urgently required to maintain conformity or security may take effect sooner where permitted by law; this does not limit mandatory notice or termination rights.
4. Free preview, quota and prices
4.1 During the preview the Service is free of charge. Each account may use up to 500,000 billed tokens per calendar month (UTC), as counted by the Service and shown in the dashboard. Requests beyond the quota are refused until the next month begins. We may also apply an internal compute cap per account, as described in the documentation.
4.2 We may change the free quota under the conditions in section 3.2, or introduce paid plans, with at least 30 days' notice by e-mail. If we introduce paid plans, we currently plan to offer them to businesses. Paid use starts only if you actively choose a paid plan; the preview does not turn into a paid plan automatically.
5. Acceptable use
5.1 You may use the Service only in compliance with applicable law and these Terms. In particular you must not:
- use the Service, or build on it, for a high-risk use under Annex III of Regulation (EU) 2024/1689 (the "EU AI Act"), such as decisions on employment, credit, education, access to essential services, law enforcement or migration, unless you have carried out the compliance work that the EU AI Act requires of you for that use and you remain responsible for it;
- use the Service for a practice prohibited under Article 5 of the EU AI Act;
- send special categories of personal data (Article 9 GDPR) or data about criminal convictions and offences (Article 10 GDPR) unless you have a legal basis for this processing and for disclosing the data to us;
- send content whose processing violates the rights of third parties or applicable law;
- circumvent or test rate limits, quotas, authentication or other protective measures, or create several accounts to get around quotas;
- carry out load tests, vulnerability scans, penetration tests or other security testing against the Service without our prior written consent (a request to legal.jein@snblago.com is enough; we answer promptly);
- scrape, systematically extract or replicate the Service or its Outputs in order to train or build a competing service, or resell access to the Service without our consent;
- disrupt or overload the Service or its infrastructure, or introduce malware.
5.2 The Service enforces rate limits and concurrency limits per account. Their current values are listed in the documentation. Requests above the limits are rejected; clients should retry as documented.
5.3 If you breach this section, or if there are concrete indications of a breach, we may temporarily block the affected API keys or account, to the extent that is necessary and proportionate. We take your legitimate interests into account and, where possible, notify you in advance. Our right to terminate for cause (section 13) remains.
6. API keys
6.1 API keys are shown only once, when they are created. We store only a hash of each key and cannot show it again.
6.2 Treat API keys like passwords: do not publish them, do not embed them in client-side code, and revoke a key in the dashboard without undue delay if it may have been disclosed. Use of the Service with your keys is attributed to you until you revoke them.
7. Availability
7.1 The Service is a preview and is provided without a service level agreement. We aim for good availability but do not owe a particular uptime, response time or throughput.
7.2 We may interrupt the Service for maintenance, security updates or to prevent disruption, and we try to schedule planned maintenance so as to affect as few users as possible.
8. Outputs
8.1 Outputs are generated automatically by a statistical machine-learning model. They can be wrong, incomplete or inconsistent, and the same Input can yield different probabilities across model versions. Outputs are not advice and do not constitute a decision or declaration by us.
8.2 You are responsible for checking Outputs before relying on them, for the decisions you make with them and for their effect on your own users. Where you make decisions about natural persons based on Outputs, you are responsible for complying with Article 22 GDPR and, where applicable, the transparency duties of the EU AI Act towards those persons.
9. Intellectual property and licences
9.1 The Laya model weights are published under the Apache License, Version 2.0. Nothing in these Terms restricts your rights under that licence.
9.2 As between you and us, you retain all rights in your Input and in the Output generated for you. We claim no rights in them and use them only to provide the Service to you, as described in the Privacy Policy and, where applicable, the DPA.
9.3 We retain all rights in the Service itself, including its software, dashboard, documentation and trademarks. We grant you a non-exclusive, non-transferable right, limited to the term of the contract, to use the Service and the documentation for your own purposes in accordance with these Terms.
10. Data protection
10.1 Where you send personal data to the API as a controller under the GDPR, we process it on your behalf as a processor under Article 28 GDPR. The DPA at https://jein.dev/dpa/ applies and forms part of these Terms. For purely personal or household use, we process request content as a controller solely to return the response, as explained in the Privacy Policy. In both cases we do not store or log Input or Output; they are processed in memory only for the duration of the request.
10.2 For account, key, usage and log data we are the controller; see the Privacy Policy.
11. Confidentiality
11.1 Each party will keep confidential the other party's non-public information that is marked as confidential or is evidently confidential, use it only for the purposes of this contract and protect it with at least reasonable care. This does not apply to information that is or becomes public without breach, that the receiving party already had or developed independently, or that must be disclosed by law or by order of a court or authority (in that case, where permitted, the other party is informed in advance).
11.2 Input and Output are confidential information of the Customer.
11.3 These obligations survive the end of the contract for three years; for personal data covered by the DPA, the DPA applies without time limit.
12. Liability
12.1 We are liable without limitation for damage caused intentionally or by gross negligence, for injury to life, body or health, for fraudulently concealed defects, under the German Product Liability Act (Produkthaftungsgesetz), to the extent we have given a guarantee, and wherever liability cannot be limited by law.
12.2 For slight negligence we are liable only for the breach of an obligation whose fulfilment makes the proper performance of the contract possible in the first place and on whose observance you may regularly rely (cardinal obligation, Kardinalpflicht). In that case our liability is limited to the damage that was foreseeable and typical for this type of contract when the contract was concluded.
12.3 Otherwise, liability for slight negligence is excluded.
12.4 The above limitations also apply to the personal liability of our employees, representatives and agents.
12.5 You are responsible for regular backups of your own data and for keeping a fallback for decisions that depend on the Service. For loss of data we are liable, within the limits above, only for the effort that would have been required to restore the data had you taken such precautions.
12.6 You indemnify us against claims by third parties to the extent they arise from your culpable breach of these Terms (in particular section 5) or of applicable law in connection with your Input or your use of Outputs; this does not apply to the extent the claim is caused by our own breach of duty. We will inform you of such claims without undue delay and allow you to defend them.
13. Term and termination
13.1 The contract runs for an indefinite period.
13.2 You may terminate at any time free of charge and without notice, by deleting your account in the dashboard or by a declaration in text form (for example an e-mail to legal.jein@snblago.com). Deletion revokes all API keys, deletes your account data as described in the Privacy Policy and deletes your user at our identity provider (without undue delay, at the latest within one month). If you terminate by a declaration, the contract ends when we receive it; we then delete your account without undue delay, with the same effects.
13.3 We may terminate with 30 days' notice by e-mail. When the Service is discontinued as a whole, we give at least 30 days' notice.
13.4 The right of either party to terminate for cause (aus wichtigem Grund) is unaffected. Cause for us exists in particular if you use the Service in serious or repeated breach of section 5.
13.5 Terminations by us are made in text form (e-mail is sufficient).
14. Changes to these Terms
14.1 We may change these Terms for valid reasons, in particular changes in the law or case law, new functions of the Service, or security requirements, provided the change is reasonable for you taking our interests into account.
14.2 We will send you the changed Terms by e-mail at least six weeks before they take effect, highlighting the changes. The changes are deemed accepted if you do not object in text form before they take effect. In the notice we will point out your right to object, the deadline and the consequence of not objecting. If you object, the current Terms continue to apply; each party may then terminate the contract with effect from the date the changes would have taken effect.
14.3 Changes to the essential obligations of the parties (in particular to the price) require your express consent. The introduction of paid plans follows section 4.2.
14.4 Where a change to these Terms also changes the Service and adversely affects access or use by more than a minor amount, the durable-medium notice and free termination rights in section 3.2 apply in addition. Silence under section 14.2 does not waive those rights or any mandatory consumer rights.
15. Governing law, venue and final provisions
15.1 These Terms and the contract are governed by the laws of the Federal Republic of Germany, excluding the UN Convention on Contracts for the International Sale of Goods (CISG). If you are a consumer and Article 6(2) of the Rome I Regulation applies, this choice does not deprive you of the protection of mandatory provisions of the law of your habitual residence.
15.2 This venue clause does not apply to consumers; their statutory jurisdiction rights, including those under Articles 17–19 of the Brussels I bis Regulation, remain unaffected. For other Customers, if you are a merchant (Kaufmann), a legal entity under public law or a special fund under public law, or have no general place of jurisdiction in Germany, the exclusive place of jurisdiction for all disputes arising from or in connection with this contract is our place of business (currently Hoyerswerda, Germany). We may also sue you at your general place of jurisdiction.
15.3 Declarations under this contract may be made in text form (for example by e-mail) unless these Terms require otherwise. Notices of more than minor adverse changes must be provided on a durable medium as set out in sections 3.2 and 14.4; a dashboard announcement alone is not sufficient.
15.4 You may transfer rights and obligations under this contract to a third party only with our consent; § 354a HGB remains unaffected.
15.5 Should any provision of these Terms be or become invalid, the remaining provisions remain valid. The statutory provisions apply in place of the invalid provision (§ 306 BGB).