nastalgic

Nastalgic Terms of Service

Effective Date: April 16, 2026 Last Updated: April 16, 2026

These Terms of Service (the “Terms”) form a binding agreement between Nastalgic LLC, an Illinois limited liability company (“Nastalgic,” “we,” “us,” or “our”), and you (“you” or “Customer”). They govern your access to and use of Nastalgic’s memory and knowledge API, developer tools, web application, documentation, and related services (collectively, the “Service”).

By creating an account, clicking “I agree,” issuing an API request, or otherwise using the Service, you agree to these Terms and our Privacy Policy. If you do not agree, do not use the Service.

⚠️ IMPORTANT — Please read Sections 15 (Disclaimer of Warranties), 16 (Limitation of Liability), and 18 (Binding Arbitration and Class Action Waiver) carefully. They limit our liability and require disputes to be resolved by individual arbitration.

1. The Service

Nastalgic provides a hosted memory and knowledge API that lets you and your applications store, retrieve, extract, and organize conversational data, documents, and facts, including features such as:

  • Vault-based tenant data isolation
  • Conversation storage and retrieval
  • Retrieval-augmented generation (RAG) endpoints
  • Background extraction jobs (fact extraction, entity resolution, knowledge-graph construction)
  • Personas, evidence, search, and memory endpoints
  • Personal access tokens (PATs) and bring-your-own-key (BYOK) credential management
  • A web demo and administration interface at public_web

Nastalgic is not a chat application and does not generate end-user chat responses. You or your integrations supply the client-side LLM that produces user-facing output; Nastalgic only uses LLMs server-side for background extraction tasks.

2. Beta / Early Access

The Service is currently offered as a beta / early access product. You acknowledge that:

  • The Service may contain bugs, errors, or incomplete features.
  • Features may be added, changed, degraded, or removed at any time without notice.
  • No service-level agreement (SLA), uptime commitment, or availability guarantee applies during beta.
  • Data stored in the Service during beta may be lost, corrupted, or deleted as a result of bugs, migrations, or operational issues. You are responsible for keeping your own backups of any data you cannot afford to lose.

Sections 15 (Disclaimers) and 16 (Limitation of Liability) apply with particular force during the beta period.

3. Eligibility

You must be at least 18 years old and capable of forming a binding contract under applicable law to use the Service. By using the Service you represent and warrant that you meet this requirement. The Service is not directed to, and may not be used by, children under 18.

If you are using the Service on behalf of an organization, you represent and warrant that you are authorized to bind that organization to these Terms, and “you” refers to that organization.

4. Accounts, Teams, and Authorized Users

4.1 Individual Accounts

You are responsible for maintaining the confidentiality of your credentials (passwords, PATs, refresh tokens, BYOK keys) and for all activity that occurs under your account. Notify us at rob@nastalgic.com immediately if you suspect unauthorized access.

4.2 Team and Business Accounts

If you subscribe to a team, business, or enterprise plan (a “Team Plan”), the organization that contracts with Nastalgic (the “Customer Organization”) is the customer under these Terms. Individual users invited by the Customer Organization (“Authorized Users”) access the Service under the Customer Organization’s account.

  • The Customer Organization is responsible for: (a) all Authorized Users’ compliance with these Terms, (b) all data Authorized Users store in the organization’s vaults (“Customer Data”), (c) all fees incurred, and (d) any administrative actions (provisioning, suspending, or removing Authorized Users).
  • Authorized Users must also comply with our Acceptable Use Policy (Section 9).
  • Customer Data belongs to and is controlled by the Customer Organization, not the individual Authorized User.

4.3 Account Security

You must use commercially reasonable measures to protect your account, including strong passwords, appropriate scoping of PATs, and prompt revocation of compromised credentials.

5. Fees, Billing, and Plans

5.1 Plan Types

Nastalgic offers multiple plan types, which may include:

  • Free tier: limited usage at no cost.
  • Paid subscriptions: monthly or annual recurring plans.
  • Usage-based / metered plans: fees computed from API calls, storage consumed, extraction jobs run, or other measured usage.
  • Team plans: per-seat or per-organization pricing for Customer Organizations.
  • Bring-your-own-key (BYOK): plans under which you provide your own LLM provider credentials; see Section 6.

Current plan details, pricing, metering definitions, and included quotas are published on our pricing page and are incorporated into these Terms by reference.

5.2 Payment

Fees are quoted and payable in U.S. dollars. You authorize us (and our payment processors) to charge your designated payment method for all fees when due. Paid subscriptions auto-renew at the end of each billing period at the then-current rate unless canceled before renewal.

5.3 Usage-Based Charges

For metered plans, we measure usage server-side, and those measurements are final absent manifest error. You are responsible for monitoring your usage and setting any limits offered in the Service.

5.4 Taxes

Fees are exclusive of taxes. You are responsible for all applicable sales, use, VAT, GST, and similar taxes, other than taxes on Nastalgic’s net income.

5.5 Late Payments

Past-due amounts may accrue interest at the lesser of 1.5% per month or the maximum rate allowed by law. We may suspend the Service for non-payment after reasonable notice.

5.6 No Refunds

Except where required by law or expressly stated in a written agreement signed by Nastalgic, all fees are non-refundable, including for partial billing periods, unused quotas, or accounts terminated for breach.

5.7 Changes to Pricing

We may change fees, quotas, and plan features on at least 30 days’ notice for recurring subscriptions. Changes take effect at the start of your next billing period after the notice period.

6. Bring-Your-Own-Key (BYOK) and Third-Party Providers

If you use BYOK features to integrate third-party LLM providers (such as OpenAI, Anthropic, Google, or a self-hosted provider like Ollama), you acknowledge and agree that:

  • You are solely responsible for your relationship with the third-party provider, including for all fees, charges, quotas, throttling, account actions, and compliance with that provider’s terms of service and acceptable-use policies.
  • Nastalgic is not a party to, and assumes no obligations under, your agreement with the third-party provider.
  • Nastalgic is not liable for any outage, error, charge, data-handling decision, content policy, or suspension imposed by a third-party provider.
  • You authorize Nastalgic to transmit your prompts, embeddings, extracted facts, and other relevant data to the third-party provider on your behalf when you invoke BYOK-backed features.
  • You are responsible for ensuring that your data may lawfully be sent to the third-party provider and jurisdiction you have chosen.

Nastalgic takes reasonable measures to encrypt BYOK credentials at rest and in transit, but does not guarantee their security against all possible threats. See Section 13 (Security).

7. Customer Data

7.1 Your Ownership

As between you and Nastalgic, you own all Customer Data — the messages, documents, facts, graph entries, and other content you or your Authorized Users store in the Service.

7.2 Limited License to Nastalgic

You grant Nastalgic a worldwide, non-exclusive, royalty-free license to host, process, copy, transmit, display, and create derivative works from your Customer Data solely as necessary to: (a) provide, operate, and maintain the Service for you; (b) perform background extraction, indexing, and retrieval on your behalf; (c) generate aggregated, anonymized operational metrics; and (d) comply with legal obligations.

7.3 No Training on Customer Data

Nastalgic does not use Customer Data to train, fine-tune, or improve any machine learning model — whether our own, a third party’s, or a foundation model. This applies to messages, uploaded documents, extracted facts, knowledge-graph entries, and any derivative of the foregoing.

We may use aggregated, anonymized operational telemetry (e.g., request counts, latency distributions, error rates) that does not contain Customer Data to improve the Service.

7.4 QA Access Program (Opt-In)

Separately from training, we offer an opt-in QA Access Program under which you may grant Nastalgic permission to view Customer Data for testing and quality-assurance purposes only (for example, to reproduce a bug or verify extraction accuracy). The program is off by default, is subject to logging and confidentiality controls, may be revoked at any time, and is never used to train any machine-learning model. For Team Plans, only the Customer Organization’s admin can opt in. Full details — scope, permitted and prohibited uses, retention of QA outputs, and revocation — are set out in the Privacy Policy (Section 6).

7.5 Your Responsibility for Customer Data

You represent and warrant that:

  • You have all rights necessary to submit the Customer Data to the Service.
  • Your Customer Data does not violate the Acceptable Use Policy (Section 9).
  • Where Customer Data contains personal information about third parties (e.g., people described in your memories), you have the legal basis to collect and process it.

7.6 Backups

While we take reasonable measures to preserve Customer Data, you are responsible for maintaining independent backups of any data whose loss you could not tolerate, particularly during the beta period (Section 2).

8. Your Content Outside Vaults; Feedback

8.1 Public or Shared Content

If the Service offers any feature that lets you publish or share content outside your own vault (e.g., with other users or publicly), you grant us the license in Section 7.2 as applied to that content plus a license to display and distribute it through the Service to the audience you choose.

8.2 Feedback

If you submit suggestions, feature requests, bug reports, or other feedback about the Service (“Feedback”), you grant Nastalgic a perpetual, irrevocable, worldwide, royalty-free, fully paid-up, sublicensable license to use, reproduce, modify, and exploit that Feedback for any purpose, without any obligation or compensation to you. You waive any moral rights in the Feedback to the extent permitted by law.

9. Acceptable Use Policy

You agree not to use the Service, and not to permit any Authorized User to use the Service, to:

  1. Violate any applicable law, regulation, or third-party right.
  2. Store, transmit, generate, or solicit child sexual abuse material (CSAM) or any content that sexually exploits or depicts minors.
  3. Harass, threaten, defame, stalk, or intimidate any person; incite violence; or promote terrorism.
  4. Distribute malware, spyware, ransomware, or other malicious code, or use the Service to probe, scan, or attack any network or system.
  5. Infringe any patent, copyright, trademark, trade secret, privacy, publicity, or other intellectual property or proprietary right.
  6. Submit personal information about third parties without a lawful basis (for example, non-public identifiers such as U.S. Social Security numbers, government IDs, or financial account numbers belonging to people who have not consented).
  7. Reverse engineer, decompile, or attempt to derive the source code of the Service, except to the extent expressly permitted by applicable law.
  8. Circumvent or disable any rate limit, quota, authentication, access control, or security feature of the Service.
  9. Use the Service to build a competing service, benchmark the Service for a competitor, or train a model that is designed to replicate the Service’s functionality.
  10. Resell, sublicense, or otherwise make the Service available to third parties except as expressly permitted in a plan you have subscribed to.
  11. Submit data that is subject to specialized regulatory regimes that the Service is not certified for (including, without limitation, protected health information subject to HIPAA, cardholder data subject to PCI-DSS, or data subject to export controls beyond those described in Section 10), unless Nastalgic has signed a written agreement permitting such data.
  12. Impersonate any person or entity, or misrepresent your affiliation with any person or entity.

We may suspend or terminate access for any violation, with or without prior notice depending on severity. See Section 14.

10. Export Controls and Sanctions

The Service is controlled and operated from the United States. You represent and warrant that:

  • You are not located in, under the control of, or a national or resident of any country subject to comprehensive U.S. trade sanctions (currently including Cuba, Iran, North Korea, Syria, and the Crimea, so-called Donetsk People’s Republic, and so-called Luhansk People’s Republic regions of Ukraine).
  • You are not listed on any U.S. government list of prohibited or restricted parties (including the U.S. Treasury Department’s List of Specially Designated Nationals and the U.S. Department of Commerce’s Denied Persons List or Entity List).
  • You will not use the Service in any manner that would cause Nastalgic to violate U.S. export, import, or sanctions laws.

11. Intellectual Property

11.1 Nastalgic’s IP

The Service, including all software, APIs, documentation, user interfaces, designs, text, graphics, logos, the “Nastalgic” name and marks, and any improvements or derivative works, is owned by Nastalgic or its licensors and is protected by U.S. and international intellectual property laws. Except for the limited rights expressly granted to you in these Terms, Nastalgic reserves all rights.

11.2 License to You

Subject to your compliance with these Terms and payment of applicable fees, Nastalgic grants you a limited, non-exclusive, non-transferable, non-sublicensable license during the term of your account to access and use the Service solely for your internal business or personal purposes.

11.3 Trademarks

“Nastalgic,” the Nastalgic logo, and related marks are trademarks of Nastalgic LLC. You may not use them without our prior written consent, except to fairly and factually describe your use of the Service.

12. DMCA Notice and Takedown

Nastalgic respects intellectual property rights. If you believe material accessible through the Service infringes your copyright, send a written notice to our Designated Agent containing the information required by 17 U.S.C. § 512(c)(3):

  1. A physical or electronic signature of the copyright owner or authorized agent.
  2. Identification of the copyrighted work claimed to be infringed.
  3. Identification of the material that is claimed to be infringing and information reasonably sufficient to let us locate it.
  4. Your contact information (address, telephone number, email).
  5. A statement that you have a good-faith belief that the use is not authorized by the copyright owner, its agent, or the law.
  6. A statement, under penalty of perjury, that the information in the notice is accurate and that you are authorized to act on behalf of the copyright owner.

Designated Agent for Notice of Claims of Copyright Infringement:

Nastalgic LLC — DMCA Agent Email: rob@nastalgic.com (subject line: “DMCA Notice”)

We may disable access to allegedly infringing material and terminate repeat infringers’ accounts. If you believe material was removed in error, you may submit a counter-notice meeting the requirements of 17 U.S.C. § 512(g).

13. Security

We use industry-standard administrative, technical, and physical safeguards designed to protect Customer Data, including encryption in transit (TLS) and encryption at rest for stored secrets and BYOK credentials. Despite these measures, no service is perfectly secure. You acknowledge the inherent risks of transmitting data over the internet and agree that Nastalgic is not liable for unauthorized access that occurs despite our reasonable efforts.

If Nastalgic becomes aware of a security incident that affects your Customer Data, we will notify you without undue delay as required by applicable law.

14. Suspension, Termination, and Data Retention

14.1 Termination by You

You may cancel your account at any time through the Service or by emailing rob@nastalgic.com. Cancellation takes effect at the end of the current billing period; no pro-rated refunds will be issued.

14.2 Termination or Suspension by Us

We may suspend or terminate your access, with or without notice depending on severity, if:

  • You breach these Terms, including the Acceptable Use Policy.
  • Your account is past due after reasonable notice.
  • We reasonably believe your use creates legal, security, or operational risk.
  • We discontinue the Service or a feature you rely on (with at least 30 days’ notice where practicable).

14.3 Effect of Termination

On termination, your license to use the Service ends and we may block further access.

14.4 Data Retention After Termination

Upon termination, Nastalgic will retain Customer Data for a 30-day grace period during which you may request export or reactivation of your account by contacting rob@nastalgic.com. After the 30-day grace period expires, Nastalgic will delete Customer Data from production systems, except for:

  • Backups that will age out under our normal retention schedule,
  • Aggregated or anonymized data that does not identify you, and
  • Data we are required to retain by law.

For Team Plans, the Customer Organization (not an individual Authorized User) controls deletion and export requests for organizational vaults.

14.5 Survival

Sections that by their nature should survive termination will survive, including Sections 5 (unpaid fees), 7.1 (ownership), 8.2 (Feedback), 11 (IP), 14.4 (retention), 15 (Disclaimers), 16 (Limitation of Liability), 17 (Indemnification), 18 (Arbitration), and 20 (General).

15. Disclaimer of Warranties

THE SERVICE IS PROVIDED “AS IS” AND “AS AVAILABLE,” WITH ALL FAULTS AND WITHOUT WARRANTY OF ANY KIND. TO THE MAXIMUM EXTENT PERMITTED BY LAW, NASTALGIC AND ITS AFFILIATES, OFFICERS, EMPLOYEES, AGENTS, AND LICENSORS DISCLAIM ALL WARRANTIES, WHETHER EXPRESS, IMPLIED, STATUTORY, OR OTHERWISE, INCLUDING WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, TITLE, NON-INFRINGEMENT, AND ANY WARRANTIES ARISING FROM COURSE OF DEALING OR USAGE OF TRADE.

NASTALGIC DOES NOT WARRANT THAT: (a) THE SERVICE WILL BE UNINTERRUPTED, TIMELY, SECURE, OR ERROR-FREE; (b) THE SERVICE WILL MEET YOUR REQUIREMENTS; (c) ANY ERRORS WILL BE CORRECTED; (d) CUSTOMER DATA WILL NOT BE LOST, CORRUPTED, OR ALTERED; OR (e) THE OUTPUT OF AI-DRIVEN EXTRACTION OR RETRIEVAL FEATURES WILL BE ACCURATE, COMPLETE, OR FREE OF BIAS.

AI AND MACHINE LEARNING OUTPUT IS PROBABILISTIC. Extracted facts, inferences, and generated summaries may be incorrect, misleading, or offensive. You must independently verify any output of the Service before relying on it for consequential decisions.

Some jurisdictions do not allow the exclusion of certain warranties; in such jurisdictions, the above exclusions apply to the maximum extent permitted.

16. Limitation of Liability

TO THE MAXIMUM EXTENT PERMITTED BY LAW:

16.1 Excluded Damages

IN NO EVENT WILL NASTALGIC OR ITS AFFILIATES, OFFICERS, EMPLOYEES, AGENTS, OR LICENSORS BE LIABLE FOR ANY INDIRECT, INCIDENTAL, SPECIAL, CONSEQUENTIAL, EXEMPLARY, OR PUNITIVE DAMAGES, OR FOR ANY LOSS OF PROFITS, REVENUE, GOODWILL, DATA, OR BUSINESS OPPORTUNITIES, WHETHER ARISING IN CONTRACT, TORT (INCLUDING NEGLIGENCE), STRICT LIABILITY, OR OTHERWISE, EVEN IF NASTALGIC HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.

16.2 Aggregate Cap

NASTALGIC’S TOTAL AGGREGATE LIABILITY ARISING OUT OF OR RELATING TO THESE TERMS OR THE SERVICE WILL NOT EXCEED THE GREATER OF (a) THE FEES YOU ACTUALLY PAID NASTALGIC FOR THE SERVICE IN THE TWELVE (12) MONTHS IMMEDIATELY PRECEDING THE EVENT GIVING RISE TO LIABILITY, OR (b) ONE HUNDRED U.S. DOLLARS ($100).

16.3 Basis of the Bargain

You acknowledge that the foregoing disclaimers and limitations are a material basis of the bargain between you and Nastalgic and that Nastalgic would not provide the Service on these economic terms without them. They apply even if a limited remedy fails of its essential purpose.

16.4 Jurisdictional Limits

Some jurisdictions do not allow certain limitations on liability; in such jurisdictions, the above limitations apply to the maximum extent permitted.

17. Indemnification

You will defend, indemnify, and hold harmless Nastalgic and its affiliates, officers, directors, employees, agents, and licensors from and against all claims, damages, losses, liabilities, costs, and expenses (including reasonable attorneys’ fees) arising out of or relating to:

  1. Your or your Authorized Users’ use of the Service;
  2. Your or your Authorized Users’ Customer Data, including any claim that it infringes or misappropriates any third-party right or violates any law;
  3. Your or your Authorized Users’ violation of these Terms (including the Acceptable Use Policy); or
  4. Your use of BYOK credentials or any third-party provider accessed through the Service.

Nastalgic will promptly notify you of any claim, permit you to control the defense (with counsel reasonably acceptable to Nastalgic), and reasonably cooperate with you at your expense. You may not settle any claim in a manner that imposes any obligation or admission on Nastalgic without Nastalgic’s prior written consent.

18. Binding Arbitration and Class Action Waiver

Please read this Section carefully — it affects your legal rights.

18.1 Informal Resolution

Before filing any arbitration, you agree to first try to resolve the dispute informally by emailing rob@nastalgic.com with a description of the dispute and desired resolution. If the dispute is not resolved within 60 days, either party may initiate arbitration.

18.2 Agreement to Arbitrate

Any dispute, claim, or controversy arising out of or relating to these Terms or the Service (a “Dispute”) that is not resolved informally will be resolved exclusively by final and binding individual arbitration, rather than in court, except as set out in Section 18.5.

18.3 Rules and Administrator

Arbitration will be administered by JAMS under its Streamlined Arbitration Rules and Procedures (or, at your election, by the American Arbitration Association under its Consumer Arbitration Rules for consumer Disputes). The arbitration will be conducted by a single arbitrator.

18.4 Seat and Language

The seat (legal place) of arbitration is Cook County, Illinois, USA. The arbitration will be conducted in English. The arbitrator may conduct hearings by video or telephone where appropriate, and either party may appear remotely.

18.5 Exceptions

Notwithstanding Section 18.2, either party may: (a) bring an individual action in small-claims court for a Dispute that qualifies; and (b) seek injunctive or other equitable relief in a court of competent jurisdiction to prevent or stop infringement or misuse of its intellectual property or confidential information.

18.6 Class Action Waiver

YOU AND NASTALGIC AGREE THAT EACH MAY BRING CLAIMS AGAINST THE OTHER ONLY IN ITS INDIVIDUAL CAPACITY AND NOT AS A PLAINTIFF OR CLASS MEMBER IN ANY PURPORTED CLASS OR REPRESENTATIVE PROCEEDING. The arbitrator may not consolidate more than one person’s claims and may not preside over any form of class or representative proceeding. If this class action waiver is found to be unenforceable, then the entirety of Section 18 is null and void, and the Dispute will proceed in court under Section 19.

18.7 Opt-Out

You may opt out of this arbitration agreement by sending written notice to rob@nastalgic.com with the subject line “Arbitration Opt-Out” within 30 days of first accepting these Terms. Your notice must include your name, account email, and a clear statement that you wish to opt out. Opting out does not affect any other provision of these Terms.

19. Governing Law and Venue

These Terms, and any Dispute that is not subject to arbitration under Section 18, are governed by the laws of the State of Illinois, without regard to its conflict-of-laws principles. The United Nations Convention on Contracts for the International Sale of Goods does not apply.

For any Dispute not subject to arbitration, the parties consent to the exclusive jurisdiction and venue of the state and federal courts located in Cook County, Illinois, USA.

20. General

20.1 Entire Agreement

These Terms, the Privacy Policy, and any order form, pricing page, or written agreement signed by Nastalgic with respect to your account constitute the entire agreement between you and Nastalgic regarding the Service and supersede any prior or contemporaneous agreements.

20.2 Changes to the Terms

We may update these Terms from time to time. If we make material changes, we will notify you by email (to the address associated with your account) or by a prominent notice in the Service at least 30 days before the changes take effect. Your continued use of the Service after the effective date constitutes acceptance of the updated Terms. If you do not accept the updated Terms, you must stop using the Service and may cancel your account.

20.3 Assignment

You may not assign or transfer these Terms or any rights or obligations under them without Nastalgic’s prior written consent. Nastalgic may assign these Terms without your consent in connection with a merger, acquisition, reorganization, or sale of substantially all of its assets.

20.4 Notices

Notices to Nastalgic must be sent to rob@nastalgic.com. Notices to you will be sent to the email address on file for your account or posted in the Service and are deemed received on the date sent.

20.5 No Waiver

A failure to enforce any provision is not a waiver of the right to enforce it later.

20.6 Severability

If any provision is held unenforceable, the remaining provisions will remain in full effect, and the unenforceable provision will be modified to the minimum extent necessary to make it enforceable while preserving its intent.

20.7 Force Majeure

Nastalgic is not liable for any delay or failure to perform caused by events beyond its reasonable control, including natural disasters, war, terrorism, labor disputes, governmental action, internet or utility outages, or failures of third-party providers.

20.8 Independent Contractors

The parties are independent contractors. These Terms do not create any agency, partnership, joint venture, or employment relationship.

20.9 U.S. Government Rights

The Service is a “commercial item” as defined in 48 C.F.R. § 2.101. Government users acquire only the rights expressly granted to non-government users.

20.10 Headings

Section headings are for convenience only and do not affect interpretation.

21. Contact

Questions about these Terms? Contact us:

Nastalgic LLC Email: rob@nastalgic.com

By using the Service, you acknowledge that you have read these Terms, understand them, and agree to be bound by them.