Terms and Conditions

Last updated: 2 April 2026

These Terms and Conditions (“Terms”) govern access to and use of the defi-skills managed API service, including all associated REST endpoints, agent session functionality, the browser-based playground, and any related documentation (together, the “Service”), made available at https://defi-skills.nethermind.io/ by Demerzel Solutions Limited (trading as Nethermind), a company incorporated in England and Wales (“Nethermind”, “we”, “us”, or “our”).

By accessing or using the Service, you (“User” or “you”) agree to be bound by these Terms in full. If you do not agree, you must not access or use the Service.

1. About the Service

1.1 The Service provides a hosted, managed API implementation of the defi-skills engine — a deterministic system that converts human-readable DeFi intents into raw, ABI-encoded, unsigned transaction payloads for decentralised finance (DeFi) actions across supported blockchain networks. The Service covers REST endpoints including, without limitation, GET /v1/actions and POST /v1/build, together with associated tooling and the browser playground.

1.2 The underlying defi-skills software is separately made available as open-source software under the MIT License at https://github.com/NethermindEth/defi-skills. These Terms apply solely to the hosted managed Service and do not modify or supersede the MIT License as it applies to the open-source software.

1.3 The Service does not sign transactions, broadcast transactions, hold assets, custody private keys, or interact with any blockchain on behalf of the User. All outputs produced by the Service are unsigned transaction payloads only. The User is solely responsible for reviewing, signing, and broadcasting any transaction, and for any consequences arising from doing so.

2. Licence Grant

2.1 Subject to your compliance with these Terms, Nethermind grants you a limited, non-exclusive, non-transferable, non-sublicensable, revocable licence to access and use the Service solely for your own internal purposes, whether personal, research, or commercial.

2.2 This licence does not include the right to:

• (a) reproduce, copy, modify, adapt, translate, or create derivative works of the Service or any component thereof;
• (b) reverse engineer, decompile, disassemble, or otherwise attempt to derive the source code of any proprietary component of the Service;
• (c) resell, sublicense, rent, lease, or otherwise make the Service available to third parties as a standalone offering without Nethermind’s prior written consent;
• (d) remove or obscure any proprietary notices, branding, or attribution displayed in or alongside the Service;
• (e) use the Service in any manner that could damage, disable, overburden, or impair the Service or the systems and networks through which it is provided; or
• (f) use the Service in violation of any applicable law or regulation.

2.3 Nothing in these Terms transfers any ownership of, or intellectual property rights in, the Service or any part thereof to you.

3. Access and API Keys

3.1 Access to certain Service endpoints requires a valid API key issued by Nethermind. You are responsible for maintaining the confidentiality of your API key and for all activity that occurs under it.

3.2 You must not share your API key with third parties or embed it in any publicly accessible code, repository, or application in a manner that exposes it to unauthorised use.

3.3 Nethermind reserves the right to revoke, suspend, or rotate your API key at any time, with or without notice, if it reasonably suspects misuse, breach of these Terms, or for any other reason at its sole discretion.

3.4 The Service currently operates a free tier subject to rate limiting (at the time of writing, 50 requests per day). Nethermind does not guarantee the continuation of any particular rate limit and may adjust limits at any time.

4. Fees

4.1 The Service is currently provided free of charge. Nethermind reserves the right, at its sole discretion and at any time, to introduce fees for access to all or part of the Service, including by introducing paid tiers, usage-based pricing, or other commercial arrangements.

4.2 Nethermind will provide reasonable advance notice of any fee introduction where practicable, but is under no obligation to do so. Continued use of the Service following the introduction of fees will constitute acceptance of the applicable pricing terms.

4.3 Where fees are introduced, Nethermind may offer a continued free tier at its discretion. No User shall have any right to a free tier as a matter of entitlement.

5. No Warranty

5.1 THE SERVICE IS PROVIDED “AS IS” AND “AS AVAILABLE”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED.

5.2 To the fullest extent permitted by applicable law, Nethermind expressly disclaims all warranties and conditions of any kind, whether express, implied, or statutory, including without limitation any warranty or condition of:

• (a) merchantability or fitness for a particular purpose;
• (b) satisfactory quality;
• (c) title or non-infringement;
• (d) accuracy, completeness, or reliability of any output, transaction payload, address resolution, token data, or other information produced by the Service;
• (e) uninterrupted, timely, secure, or error-free operation of the Service; or
• (f) the Service being free from viruses, malicious code, or other harmful components.

5.3 No warranty is created by any oral or written communication, documentation, or course of dealing between you and Nethermind. No advice or information obtained from Nethermind or through the Service shall create any warranty not expressly set out in these Terms.

5.4 The Service outputs unsigned transaction payloads based on deterministic logic and JSON playbooks. Nethermind makes no warranty that any transaction payload produced by the Service will be valid, accurate, complete, or appropriate for execution on any blockchain, or that any transaction executed on the basis of a Service output will succeed or produce any particular result.

6. Limitation of Liability

6.1 TO THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW, IN NO EVENT SHALL NETHERMIND, ITS DIRECTORS, OFFICERS, EMPLOYEES, CONTRACTORS, AFFILIATES, LICENSORS, OR SERVICE PROVIDERS BE LIABLE TO YOU OR ANY THIRD PARTY FOR ANY:

• (a) LOSS OF FUNDS, DIGITAL ASSETS, CRYPTOCURRENCY, OR TOKENS OF ANY KIND;
• (b) LOSS OF PROFITS, REVENUE, DATA, GOODWILL, OR BUSINESS OPPORTUNITY;
• (c) INDIRECT, INCIDENTAL, SPECIAL, CONSEQUENTIAL, OR PUNITIVE DAMAGES; OR
• (d) ANY OTHER LOSS OR DAMAGE OF ANY KIND,

WHETHER ARISING IN CONTRACT, TORT (INCLUDING NEGLIGENCE), BREACH OF STATUTORY DUTY, OR OTHERWISE, EVEN IF NETHERMIND HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES AND EVEN IF A REMEDY SET FORTH HEREIN IS FOUND TO HAVE FAILED OF ITS ESSENTIAL PURPOSE.

6.2 Without limiting the generality of clause 6.1, Nethermind shall bear no liability for:

• (a) any loss arising from a transaction signed and broadcast by you on the basis of a payload produced by the Service;
• (b) any inaccuracy in token address resolution, decimal conversion, ABI encoding, or any other output of the Service;
• (c) any failure, downtime, interruption, or degradation of the Service;
• (d) any unauthorised access to or use of your API key or account;
• (e) any changes to or discontinuation of the Service; or
• (f) any interaction between the Service and any third-party protocol, smart contract, or blockchain network.

6.3 To the extent that any liability of Nethermind cannot be excluded by law, Nethermind’s total aggregate liability to you in respect of all claims arising under or in connection with these Terms and the Service shall not exceed the total fees (if any) paid by you to Nethermind in the twelve (12) months immediately preceding the event giving rise to the claim, or $100 (one hundred US Dollars), whichever is greater.

6.4 Nothing in these Terms shall exclude or limit liability for fraud or fraudulent misrepresentation, death or personal injury caused by negligence, or any other liability that cannot be excluded or limited under applicable law.

7. User Responsibilities and Prohibited Use

7.1 You are solely responsible for:

• (a) evaluating the suitability and accuracy of any transaction payload produced by the Service before signing or broadcasting it;
• (b) ensuring your use of the Service complies with all applicable laws and regulations in your jurisdiction, including those relating to financial services, digital assets, anti-money laundering, and sanctions;
• (c) any smart contract interaction or blockchain transaction you execute on the basis of a Service output; and
• (d) maintaining appropriate security measures for your systems, API keys, and private keys.

7.2 You must not use the Service:

• (a) to facilitate any transaction or activity that is unlawful, fraudulent, or in violation of any applicable law or regulation;
• (b) to interact with or on behalf of any person or entity subject to applicable sanctions;
• (c) in a manner that places an unreasonable or disproportionate load on the Service infrastructure; or
• (d) to develop any competing service that substantially replicates the managed API service offered by Nethermind, without prior written consent.

8. MIT Licence and Open-Source Software

8.1 The defi-skills engine and its associated open-source components are licensed under the MIT License. The full text of the MIT License is available at https://github.com/NethermindEth/defi-skills/blob/main/LICENSE.

8.2 These Terms govern the managed Service only and do not restrict your rights under the MIT License with respect to the open-source software. To the extent of any inconsistency between these Terms and the MIT License as applied to the open-source software, the MIT License shall prevail in respect of that software.

8.3 The MIT License is reproduced here for convenience:

9. Modifications to the Service and Terms

9.1 Nethermind reserves the right, at its sole discretion and at any time, to modify, suspend, or discontinue the Service or any part thereof, with or without notice.

9.2 Nethermind may update these Terms at any time by posting a revised version. The revised Terms will take effect on the date indicated at the top of the document. Your continued use of the Service following the posting of revised Terms constitutes your acceptance of the changes.

9.3 It is your responsibility to review these Terms periodically. If you do not agree to any revised Terms, you must cease using the Service.

10. Termination

10.1 These Terms are effective from the date you first access the Service and will continue until terminated.

10.2 Nethermind may terminate or suspend your access to the Service immediately and without notice if you breach any provision of these Terms or if Nethermind decides, at its sole discretion, to discontinue the Service.

10.3 You may cease using the Service at any time. Termination of your use does not entitle you to any refund of fees paid (if any).

10.4 Clauses 5 (No Warranty), 6 (Limitation of Liability), 11 (Governing Law), and all other provisions that by their nature should survive, shall survive termination of these Terms.

11. Governing Law and Jurisdiction

11.1 These Terms and any dispute or claim arising out of or in connection with them or their subject matter or formation (including non-contractual disputes or claims) shall be governed by and construed in accordance with the laws of England and Wales.

11.2 The parties irrevocably agree that the courts of England and Wales shall have exclusive jurisdiction to settle any dispute or claim arising out of or in connection with these Terms or their subject matter or formation.

12. General

12.1 Entire Agreement. These Terms constitute the entire agreement between you and Nethermind with respect to the Service and supersede all prior agreements, understandings, and communications relating to the same subject matter.

12.2 Severability. If any provision of these Terms is found to be invalid, unlawful, or unenforceable, that provision shall be modified to the minimum extent necessary to make it valid and enforceable, or if that is not possible, severed from the Terms. The remaining provisions shall continue in full force and effect.

12.3 No Waiver. Nethermind’s failure to enforce any provision of these Terms shall not constitute a waiver of its right to do so in the future.

12.4 Assignment. You may not assign or transfer any of your rights or obligations under these Terms without Nethermind’s prior written consent. Nethermind may freely assign its rights and obligations under these Terms.

12.5 No Partnership. Nothing in these Terms creates a partnership, joint venture, agency, franchise, or employment relationship between you and Nethermind.

12.6 Third Party Rights. A person who is not a party to these Terms has no rights under the Contracts (Rights of Third Parties) Act 1999 to enforce any of its provisions.

13. Contact

For queries relating to these Terms or the Service, please contact:

Demerzel Solutions Limited (t/a Nethermind)
[email protected]

These Terms and Conditions do not constitute legal advice. Users with specific legal, financial, or regulatory concerns are encouraged to seek independent professional advice.