Terms of Service

Last Updated: February 3, 2026

1. Agreement to Terms

These Terms of Service ("Terms") constitute a legally binding agreement between you ("Customer," "you," or "your") and Foil ("Foil," "we," "our," or "us") governing your access to and use of the Foil AI monitoring platform, including our website, APIs, SDKs, and related services (collectively, the "Service").

By creating an account, accessing the Service, or integrating our SDKs, you acknowledge that you have read, understood, and agree to be bound by these Terms. If you are using the Service on behalf of an organization, you represent that you have authority to bind that organization to these Terms.

If you do not agree to these Terms, you may not use the Service.

2. Description of Service

Foil provides an AI model monitoring and observability platform that enables you to:

  • Trace and log AI model invocations, including inputs, outputs, and performance metrics
  • Monitor latency, token usage, costs, and error rates
  • Evaluate AI outputs for quality, safety, and security issues
  • Search traces using natural language and semantic similarity
  • Alert on anomalies and threshold violations
  • Analyze trends through dashboards and analytics
  • Experiment with A/B testing capabilities

The Service includes web-based dashboards, REST APIs, OpenTelemetry (OTLP) endpoints, and client SDKs for JavaScript/Node.js and Python.

3. Account Registration

3.1 Account Creation

To use the Service, you must create an account by providing:

  • A valid email address
  • Your first and last name
  • A password meeting our security requirements

You may also register using Google or GitHub OAuth.

3.2 Account Security

You are responsible for:

  • Maintaining the confidentiality of your password and API keys
  • All activities that occur under your account
  • Notifying us immediately of any unauthorized access

We recommend enabling strong passwords and rotating API keys periodically.

3.3 Account Information

You agree to provide accurate, current, and complete information during registration and to update such information to keep it accurate and complete.

3.4 One Account Per Entity

Each individual or organization should maintain only one account. Creating multiple accounts to circumvent usage limits or for fraudulent purposes is prohibited.

4. Subscription Plans and Billing

4.1 Plans

PlanDescription
FreeLimited usage for evaluation and small projects
StarterIncreased limits for growing teams
ProHigher limits and advanced features for production use

4.2 Usage Limits

Each plan includes limits on:

  • Number of agents
  • Monthly trace/span ingestion volume
  • API requests per minute
  • Data retention period
  • Number of team members (if applicable)

Usage exceeding plan limits may result in throttling, overage charges, or service suspension.

4.3 Billing Terms

  • Billing Cycle: Subscriptions are billed monthly or annually in advance
  • Payment Method: We accept major credit cards via Stripe
  • Currency: All charges are in US Dollars (USD)
  • Taxes: Prices exclude applicable taxes, which will be added where required

4.4 Plan Changes

  • Upgrades: Take effect immediately with prorated charges
  • Downgrades: Take effect at the next billing cycle
  • Cancellation: You may cancel at any time; service continues until the end of the current billing period

4.5 Refunds

  • Fees are generally non-refundable
  • Refunds may be provided at our discretion for service outages or billing errors
  • Annual subscriptions cancelled early are not eligible for partial refunds

4.6 Spend Limits

You may set a monthly spend limit in your account settings. We will notify you when approaching this limit and may suspend ingestion to prevent exceeding it.

4.7 Non-Payment

If payment fails, we will:

  1. Notify you and attempt to charge again
  2. After 7 days, restrict your account to read-only access
  3. After 30 days, suspend your account
  4. After 90 days, delete your data (with prior notice)

5. Acceptable Use Policy

5.1 Permitted Use

You may use the Service to:

  • Monitor AI applications you own or have authorization to monitor
  • Store trace data for debugging, analysis, and improvement purposes
  • Integrate with your systems using our APIs and SDKs

5.2 Prohibited Conduct

You agree NOT to:

Illegal Activities

  • Use the Service for any unlawful purpose
  • Transmit content that violates any law or regulation
  • Process data you do not have rights to collect or store

Harmful Content

  • Store content depicting child exploitation (will be reported to authorities)
  • Use the Service to facilitate harassment, threats, or violence
  • Intentionally store malware or malicious code

Service Abuse

  • Attempt to gain unauthorized access to the Service or other accounts
  • Circumvent rate limits, usage quotas, or security measures
  • Reverse engineer, decompile, or disassemble the Service
  • Use automated means to scrape or extract data beyond API usage
  • Resell or redistribute the Service without authorization

Infrastructure Harm

  • Introduce viruses, worms, or other malicious code
  • Attempt to disrupt or overload our infrastructure (DDoS)
  • Probe, scan, or test vulnerabilities without authorization

Misrepresentation

  • Impersonate any person or entity
  • Falsely claim affiliation with Foil
  • Provide false information during registration

5.3 Enforcement

Violation of this Acceptable Use Policy may result in:

  • Warning and request to cease the activity
  • Temporary suspension of access
  • Permanent termination of your account
  • Legal action where appropriate

We reserve the right to remove content or disable access at our discretion.

6. API and SDK Usage

6.1 API Access

We provide REST APIs and OTLP endpoints for programmatic access. API documentation is available in our docs.

6.2 API Keys

  • API keys authenticate your requests to the Service
  • Keys are scoped to your account and should be kept confidential
  • You may create, rotate, and revoke keys through the dashboard
  • Compromised keys should be revoked immediately

6.3 Rate Limits

Endpoint TypeDefault Limit
Standard API100 requests/minute
Ingestion (spans/traces)500 requests/minute
Authentication20 requests/minute

6.4 SDK License

Our SDKs are provided under the MIT License. You may use, modify, and distribute them according to that license.

6.5 API Changes

We may modify the API over time. We will:

  • Maintain backward compatibility where reasonably possible
  • Provide deprecation notices for breaking changes
  • Support deprecated endpoints for at least 6 months when feasible

7. Data Ownership and Rights

7.1 Your Data

You retain all ownership rights to the data you submit to the Service ("Customer Data"), including:

  • AI trace and span data
  • Input/output content
  • Media and attachments
  • Custom signals and feedback

7.2 License to Foil

You grant Foil a non-exclusive, worldwide, royalty-free license to:

  • Store, process, and display your Customer Data to provide the Service
  • Create aggregated, anonymized statistics for service improvement
  • Use data as necessary for security, support, and legal compliance

This license terminates when you delete your data or close your account.

7.3 Aggregated Data

We may compile anonymized, aggregated data that does not identify you or your end users. We may use such data for:

  • Service improvement and benchmarking
  • Industry research and reports
  • Marketing (e.g., "Foil processes X million traces monthly")

7.4 Foil Intellectual Property

The Service, including its design, features, documentation, and underlying technology, is owned by Foil and protected by intellectual property laws. These Terms do not grant you any rights to our trademarks, logos, or branding.

7.5 Feedback

If you provide suggestions, ideas, or feedback about the Service, you grant us the right to use such feedback without restriction or compensation.

8. AI-Powered Evaluations

8.1 Evaluation Services

The Service includes AI-powered analysis of your traces for:

  • Content quality (hallucination, NSFW, stuck behavior)
  • Security issues (prompt injection, PII leakage, jailbreak attempts)
  • Custom evaluations you configure

8.2 Third-Party AI Providers

Evaluations are processed using third-party AI services (currently OpenAI). By enabling evaluations, you acknowledge that your trace data will be sent to these providers subject to their terms and privacy policies.

8.3 Accuracy Disclaimer

AI evaluations are probabilistic and may produce:

  • False positives (flagging acceptable content)
  • False negatives (missing problematic content)

You should not rely solely on automated evaluations for critical decisions. Human review is recommended for high-stakes applications.

8.4 Opting Out

You may disable evaluations for specific agents or evaluation types through your agent settings.

9. Service Levels and Support

9.1 Availability Target

We target 99.9% uptime for the Service, excluding:

  • Scheduled maintenance (announced in advance)
  • Emergency maintenance for security or stability
  • Factors outside our control (internet outages, DDoS attacks)

9.2 Status Page

Current service status is available at our status page.

9.3 Support

PlanSupport Level
FreeCommunity forums, documentation
StarterEmail support (48-hour response)
ProPriority email support (24-hour response)

Enterprise support with SLAs is available by separate agreement.

9.4 Scheduled Maintenance

We typically perform maintenance during low-traffic periods (weekends, nights UTC). We will provide at least 24 hours notice for maintenance expected to cause downtime.

10. Disclaimers

10.1 "As Is" Provision

THE SERVICE IS PROVIDED "AS IS" AND "AS AVAILABLE" WITHOUT WARRANTIES OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO: MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, NON-INFRINGEMENT, ACCURACY OR RELIABILITY OF RESULTS.

10.2 No Guarantee

We do not guarantee that:

  • The Service will be uninterrupted or error-free
  • Defects will be corrected
  • The Service is free of viruses or harmful components
  • Results will meet your requirements

10.3 Third-Party Services

We are not responsible for third-party services (AI providers, payment processors) integrated with the Service. Your use of such services is subject to their respective terms.

11. Limitation of Liability

11.1 Exclusion of Damages

TO THE MAXIMUM EXTENT PERMITTED BY LAW, FOIL SHALL NOT BE LIABLE FOR: INDIRECT, INCIDENTAL, SPECIAL, CONSEQUENTIAL, OR PUNITIVE DAMAGES; LOSS OF PROFITS, REVENUE, DATA, OR BUSINESS OPPORTUNITIES; COST OF SUBSTITUTE SERVICES; DAMAGES ARISING FROM UNAUTHORIZED ACCESS TO YOUR DATA.

11.2 Cap on Liability

FOIL'S TOTAL LIABILITY FOR ALL CLAIMS ARISING FROM THESE TERMS OR THE SERVICE SHALL NOT EXCEED THE GREATER OF:

  • The amounts you paid to Foil in the 12 months preceding the claim, or
  • One hundred US dollars ($100)

11.3 Basis of the Bargain

The limitations in this section reflect the allocation of risk between the parties and are an essential basis of the agreement. Foil would not provide the Service without these limitations.

11.4 Exceptions

Some jurisdictions do not allow limitation of certain damages. In such cases, the limitations apply to the fullest extent permitted by law.

12. Indemnification

You agree to indemnify, defend, and hold harmless Foil and its officers, directors, employees, and agents from any claims, damages, losses, liabilities, and expenses (including reasonable attorneys' fees) arising from:

  • Your use of the Service
  • Your violation of these Terms
  • Your violation of any third-party rights
  • Customer Data you submit to the Service
  • Your end users' use of applications monitored by the Service

We will promptly notify you of any such claim and cooperate in the defense. You may not settle any claim without our prior written consent.

13. Term and Termination

13.1 Term

These Terms are effective when you create an account and continue until terminated.

13.2 Termination by You

You may terminate at any time by:

  • Cancelling your subscription through the dashboard
  • Deleting your account
  • Contacting support with a termination request

13.3 Termination by Foil

We may terminate or suspend your account:

  • Immediately for violation of these Terms or Acceptable Use Policy
  • With 30 days notice for any other reason
  • Immediately if required by law

13.4 Effect of Termination

Upon termination:

  • Your right to access the Service ends immediately
  • We will delete your Customer Data within 30 days (unless legally required to retain)
  • Outstanding payment obligations remain due
  • Provisions that should survive (IP rights, disclaimers, limitations) continue in effect

13.5 Data Export

Before termination, you may export your data using our API or by contacting support.

14. Dispute Resolution

14.1 Informal Resolution

Before filing any formal claim, you agree to contact us and attempt to resolve the dispute informally for at least 30 days.

14.2 Arbitration Agreement

Any dispute not resolved informally shall be resolved by binding arbitration, except that either party may bring claims in small claims court if eligible.

14.3 Class Action Waiver

YOU AGREE TO RESOLVE DISPUTES ONLY ON AN INDIVIDUAL BASIS AND WAIVE ANY RIGHT TO PARTICIPATE IN CLASS ACTIONS, CLASS ARBITRATIONS, OR REPRESENTATIVE ACTIONS.

14.4 Governing Law

These Terms are governed by the laws of the State of Delaware, United States, without regard to conflict of law principles.

14.5 Venue

For any claims not subject to arbitration, you consent to the exclusive jurisdiction of the state and federal courts located in Delaware.

14.6 Time Limitation

Any claim arising from these Terms must be brought within one (1) year of the cause of action, or it is permanently barred.

15. Changes to Terms

15.1 Modifications

We may modify these Terms at any time. Changes are effective when posted unless otherwise specified.

15.2 Notice

For material changes, we will provide notice via:

  • Email to your registered address
  • Prominent notice in the dashboard
  • Updated "Last Updated" date

15.3 Acceptance

Your continued use of the Service after changes constitutes acceptance. If you disagree with changes, you must stop using the Service and close your account.

16. General Provisions

16.1 Entire Agreement

These Terms, together with our Privacy Policy and any order forms, constitute the entire agreement between you and Foil regarding the Service.

16.2 Severability

If any provision is found unenforceable, the remaining provisions continue in effect, and the unenforceable provision is modified to the minimum extent necessary.

16.3 Waiver

Failure to enforce any provision does not constitute a waiver of that provision or any other provision.

16.4 Assignment

You may not assign these Terms without our written consent. We may assign our rights and obligations without restriction.

16.5 No Agency

These Terms do not create any agency, partnership, or joint venture between you and Foil.

16.6 Notices

Notices to you will be sent to the email address on your account. Notices to us should be sent to legal@getfoil.ai.

16.7 Force Majeure

Neither party is liable for delays or failures due to circumstances beyond reasonable control (natural disasters, war, terrorism, labor disputes, government actions, internet outages, pandemics).

16.8 Export Compliance

You agree to comply with all applicable export laws and regulations. You may not use the Service if you are located in a sanctioned country or are on any government prohibited party list.

16.9 Government Users

If you are a U.S. government entity, the Service is provided as "commercial computer software" under FAR 12.212 and DFARS 227.7202.

17. Contact Information

For questions about these Terms:

  • Email: legal@getfoil.ai
  • Technical support: support@getfoil.ai
  • Billing inquiries: billing@getfoil.ai
  • Privacy concerns: privacy@getfoil.ai

Appendix A: Service-Specific Terms

A.1 OpenTelemetry (OTLP) Integration

  • OTLP ingestion follows OpenTelemetry semantic conventions
  • We support both JSON and Protobuf content types
  • Spans are attributed to agents based on service.name

A.2 Semantic Search

  • Embeddings are generated using third-party AI services
  • Search results are based on semantic similarity, not exact matching
  • Embedding generation may be delayed during high load

A.3 Custom Evaluations

  • You may create custom evaluation criteria using our templates
  • Few-shot examples improve evaluation accuracy
  • ML models trained on your feedback remain associated with your account

A.4 Media Storage

  • Maximum file size: 100 MB per upload
  • Supported formats vary by category (images, documents, code, etc.)
  • Media is stored in AWS S3 with server-side encryption

A.5 Alerting

  • Alert delivery depends on third-party services (Twilio, SendGrid, Slack)
  • We do not guarantee delivery time or success of notifications
  • Rate limiting applies to prevent alert fatigue

By using Foil, you acknowledge that you have read, understood, and agree to be bound by these Terms of Service.