Version 2026-07

Terms of Service

1. About these Terms

These Terms of Service ("Terms") govern your registration for and use of:

• the DandeLiion token portal at portal.dandeliion.com;
• API credentials issued through the portal;
• the DandeLiion simulation API; and
• related documentation, interfaces and services that refer to these Terms.

Together, these are the "Service".

The Service is provided by DandeLiion Technologies Limited ("DandeLiion", "we", "us" or "our"), a company registered in England and Wales under company number 17169962, whose registered office is at 19 Water Lilies, Bristol, United Kingdom, BS11 0GJ.

By creating an account, you agree to these Terms. If you use the Service on behalf of a company, university or other organisation, you confirm that you have authority to bind that organisation. In that case, "you" includes that organisation.

If you or your organisation has entered into a separate written agreement, order form, licence or statement of work with us concerning the Service, that agreement takes priority over these Terms to the extent of any inconsistency.

2. Eligibility

You must be at least 18 years old and legally capable of entering into a contract to create an account. You must provide accurate information, use an email address that you are authorised to use and keep your account information reasonably up to date.

We may refuse registration where reasonably necessary to protect the Service, comply with law or enforce eligibility or access restrictions.

3. Accounts

Your account is personal to you or to the organisation on whose behalf it was created. You must not sell, transfer or assign your account to another person without our written permission.

You are responsible for:

• maintaining the confidentiality of your account credentials;
• using appropriate passwords and security controls;
• activity performed through your account or API tokens by people whom you have authorised;
• ensuring that authorised personnel comply with these Terms.

You must not provide false registration information, impersonate another person or create accounts to evade a restriction, suspension, quota or rate limit.

4. API tokens

The portal allows you to create API tokens for use with the DandeLiion simulation API.

A full token is displayed only once when it is created. We do not retain the full token in recoverable plaintext form and cannot display it to you again. You are responsible for copying it at creation and storing it securely.

You may use a token in applications and systems operated by you or by authorised personnel acting on your behalf. You must not:

• publish a token or place it in a public repository;
• sell, sublicense or distribute a token to an unauthorised third party;
• include a token in client-side code or another location where it is unnecessarily exposed; or
• continue using a token that you know or reasonably suspect has been compromised.

You can permanently revoke a token through the portal. Revocation cannot be reversed. If a token is lost or exposed, revoke it and create a replacement.

When you use the portal's simulation form, we may issue a short-lived API token and retain its encrypted secret in a necessary, HTTP-only cookie in that browser for up to 24 hours. The portal does not maintain simulation history in this version. Clearing cookies, signing out or switching browsers may make a run inaccessible through the portal even while the simulation API retains its artifacts under the applicable retention policy.

5. Tiers, quotas and validation

Your account may be assigned a service tier with an allowance, renewal period, maximum token lifetime and other limits. The limits currently applicable to you are shown in your account or in a separate agreement.

Unless expressly stated otherwise, the allowance belongs to the account as a whole and is shared between all tokens associated with that account. Creating additional tokens does not create additional quota.

Each successful token-validation request made for a new simulation consumes one use from the account's available allowance. The simulation API may return the existing response for an exact replay made with the same idempotency key, token and request body without consuming another use. Other repeated submissions or retries may be treated as separate requests and may consume separate uses.

A use may still be consumed where the Service successfully processes and commits a validation request but the response is delayed, interrupted or not received. You are responsible for designing integrations appropriately and avoiding unnecessary retries.

Expired, revoked or invalid tokens cannot be used to make new simulation submissions. Access may also be refused where the associated account is inactive or its allowance has been exhausted.

Quotas, credits and allowances:

• have no cash value;
• cannot be sold or transferred unless we expressly agree otherwise;
• may expire or renew in accordance with the applicable tier; and
• may be corrected where an administrative or technical error has occurred.

We may apply reasonable rate limits and other technical controls to protect the availability and security of the Service.

6. Permitted use

Subject to these Terms and any applicable tier or separate agreement, we grant you a limited, non-exclusive, non-transferable and revocable right to access and use the Service for lawful professional, commercial, academic, research or personal purposes.

You must use the Service in accordance with its documentation and any technical restrictions communicated to you.

7. Acceptable use

You must not use, or attempt to use, the Service:

• in breach of any applicable law, regulation, export control or sanctions restriction;
• to infringe the intellectual-property, confidentiality, privacy or other rights of another person;
• to access another user's account, submissions, results, logs or other information without authorisation;
• to bypass or manipulate quotas, token expiry, validation, rate limits, authentication or security controls;
• to disrupt, overload, damage or impair the Service or any connected system;
• to introduce malware, malicious code or harmful data;
• to carry out penetration testing, vulnerability scanning or other security testing without our prior written permission;
• to obtain unauthorised access to source code, systems, models, parameters or data;
• to reverse engineer, decompile, disassemble or otherwise attempt to discover the source code or internal operation of the Service, except to the limited extent that applicable law expressly permits this and does not allow the restriction to be excluded;
• to make systematic queries, analyse outputs or use other extraction techniques for the purpose of reconstructing, replicating or creating a substitute for the underlying DandeLiion models, algorithms, parameters or software;
• to resell, sublicense, provide bureau access to or commercially exploit the Service itself without our written agreement; or
• to assist another person in doing any of the above.

Reasonable use of simulation outputs in your own engineering, research, analysis, reports and products is not prohibited merely because those outputs were generated through the Service, subject to the intellectual-property provisions below and any separate agreement.

8. Simulation limitations and user responsibility

The Service provides mathematical and numerical simulations. Simulation results depend on the selected model, parameters, assumptions, numerical methods, input quality and operating conditions.

Models necessarily simplify physical systems. Results may contain numerical error, modelling error, uncertainty, incomplete information or behaviour that differs from a physical cell, battery, system or experiment.

You are responsible for:

• selecting an appropriate model and inputs;
• reviewing the assumptions and limitations described in the documentation;
• assessing whether results are suitable for your intended purpose;
• independently checking and validating material results; and
• using appropriately qualified professional and engineering judgement.

Simulation outputs do not constitute product certification, regulatory approval, safety approval or a guarantee of physical performance.

You must not rely on the Service as the sole basis for a safety-critical decision, regulatory submission, product release or other decision where an error could reasonably result in death, personal injury, material property damage or environmental harm. Appropriate testing, verification, risk assessment and professional review must also be carried out.

9. Your inputs

You retain any rights that you hold in parameters, configurations, files, instructions and other material that you submit to the Service ("Inputs").

You confirm that:

• you own the Inputs or have all permissions necessary to submit and process them;
• our processing of the Inputs to provide the Service will not infringe another person's rights;
• the Inputs do not contain unlawful or malicious material; and
• you will not submit personal data, confidential information or export-controlled information unless you are authorised to do so and the Service is appropriate for that information.

You grant us a limited right to host, copy, transmit and process Inputs only as reasonably necessary to provide, secure, support and maintain the Service, comply with law and enforce these Terms.

Any additional confidentiality, data-location or information-security requirements must be agreed with us in writing.

10. Simulation outputs

Subject to these Terms, any applicable tier and any separate agreement, you may use outputs generated for you by the Service ("Outputs") for your lawful purposes.

Your right to use Outputs does not transfer ownership of or grant rights in:

• the DandeLiion software, models, algorithms or documentation;
• model parameters or datasets that we or our licensors own;
• the structure or internal operation of the Service; or
• third-party material incorporated into the Service.

Outputs may not be unique. Similar or identical outputs may be generated for other users who provide similar inputs.

11. Our intellectual property

The Service, including its software, models, algorithms, interfaces, documentation, branding and underlying technology, is owned by or licensed to DandeLiion and is protected by intellectual-property law.

Except for the limited rights expressly granted by these Terms or a separate written agreement, no rights in the Service or our intellectual property are transferred to you.

If you voluntarily provide suggestions or feedback about the Service, you grant us a perpetual, worldwide, royalty-free right to use that feedback to develop and improve our products and services. This does not give us ownership of your Inputs or confidential technical information.

12. Charges and paid plans

Some tiers or features may be provided free of charge. Free access does not create a right to continued availability, a particular allowance or any future free allocation.

If we introduce or offer a paid plan, the applicable price, billing period, taxes, renewal arrangements, cancellation rights and payment terms will be stated before you purchase it in a pricing page, order form or separate agreement.

We will not charge you merely because you created a free account unless you separately and expressly agree to a paid service.

13. Availability, maintenance and changes

We will use reasonable care and skill in providing the Service. However, we do not guarantee that it will always be available, uninterrupted or free from errors.

We may temporarily restrict the Service for maintenance, security, capacity management, upgrades or circumstances outside our reasonable control.

We may change the Service, documentation, models, technical interfaces and free-tier limits. Where a change is likely to materially disadvantage existing users, we will provide reasonable notice where practicable, unless an immediate change is required for security, legal or technical reasons.

Any service levels or commitments concerning a paid service apply only where they are expressly stated in the applicable order or separate agreement.

14. Suspension and termination

We may suspend or restrict an account or token where we reasonably believe that:

• these Terms have been breached;
• the account, token or Service has been compromised;
• the use presents a security, legal or operational risk;
• the use may harm another user or third party;
• payment due under a separate agreement is overdue; or
• suspension is required by law or by a competent authority.

Where reasonably practicable, we will explain the reason and provide an opportunity to remedy the issue. We may act without prior notice where immediate action is reasonably required to protect the Service, users or third parties.

You may stop using the Service at any time and may request account deletion through the portal. We may discontinue a free service or free tier by giving reasonable notice where practicable.

On termination, your right to make new use of the Service ends. Provisions concerning intellectual property, accrued payment obligations, liability, governing law and any terms that by their nature should survive will continue to apply.

15. Privacy

Our Privacy Notice explains how we collect and use personal data in connection with the Service. It is separate from these Terms and does not form part of the contract except where these Terms expressly state otherwise.

When registering, you will be asked to acknowledge that you have read the current Privacy Notice. This acknowledgement does not constitute consent to all processing. We process personal data using the lawful bases described in the Privacy Notice.

16. Third-party services

The Service may depend on third-party hosting, database, email, networking or other infrastructure. We are not responsible for third-party products or services that you independently choose to use with the Service.

Links to external websites are provided for convenience and do not imply that we endorse or control those websites.

17. Liability

Nothing in these Terms excludes or limits liability where doing so would be unlawful. In particular, nothing excludes or limits liability for death or personal injury caused by negligence, fraud or fraudulent misrepresentation, or any statutory right or liability that cannot lawfully be excluded or limited.

If you are a consumer

If you are acting wholly or mainly outside your trade, business, craft or profession, your mandatory statutory rights are unaffected.

We are responsible for loss or damage that is a foreseeable result of our breach of these Terms or our failure to use reasonable care and skill. We are not responsible for loss that was not reasonably foreseeable when the contract was formed.

The Service is intended primarily for technical, research and professional use. If you use it as a consumer, we are not responsible for business losses, including loss of profit, revenue, business opportunity or business interruption.

If you are a business user

To the maximum extent permitted by law, all warranties, conditions and other terms implied by statute or common law are excluded, except for any obligation that cannot lawfully be excluded.

We will not be liable for:

• indirect or consequential loss;
• loss of profit, revenue, contracts, business, opportunity, anticipated savings or goodwill;
• loss or corruption of data where the loss could reasonably have been avoided by maintaining appropriate copies or backups; or
• loss resulting from reliance on an Output without appropriate independent checking, testing or professional review.

Our total aggregate liability arising out of or in connection with the Service in any 12-month period will not exceed the greater of £100 and the total fees paid or payable by you for the affected Service during that 12-month period.

The limitations in this section apply regardless of whether the claim arises in contract, tort, negligence, misrepresentation, breach of statutory duty or otherwise.

18. Changes to these Terms

We may update these Terms to reflect changes to the Service, our business, applicable law or security requirements.

We will publish the new version. If a change is material, we will give registered users reasonable notice where practicable.

We may require you to accept an updated version before you can create or manage tokens or continue using affected parts of the Service. If you do not accept the updated Terms, you must stop using the affected Service and may delete your account.

A change will not apply retrospectively to a dispute that arose before the change took effect.

19. General provisions

If any provision of these Terms is found to be invalid or unenforceable, the remaining provisions will continue in effect. A delay in enforcing these Terms does not waive the right to enforce them later.

You may not assign or transfer your rights under these Terms without our written permission. We may transfer our rights and obligations as part of a reorganisation, financing, merger, acquisition or sale of our business, provided that this does not materially reduce any mandatory rights you have.

These Terms, together with any applicable order or separate written agreement, constitute the entire agreement concerning the Service. This does not exclude liability for fraud or fraudulent misrepresentation.

No person other than you and DandeLiion has a right to enforce these Terms under the Contracts (Rights of Third Parties) Act 1999.

20. Governing law and disputes

These Terms are governed by the law of England and Wales.

If you are a business user, the courts of England and Wales will have exclusive jurisdiction over disputes arising from these Terms or the Service.

If you are a consumer, you retain any mandatory rights available under the law of the country in which you live and may bring proceedings in any court available to you under applicable consumer law.

21. Contact