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
| Plan | Description |
|---|---|
| Free | Limited usage for evaluation and small projects |
| Starter | Increased limits for growing teams |
| Pro | Higher 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:
- Notify you and attempt to charge again
- After 7 days, restrict your account to read-only access
- After 30 days, suspend your account
- 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 Type | Default Limit |
|---|---|
| Standard API | 100 requests/minute |
| Ingestion (spans/traces) | 500 requests/minute |
| Authentication | 20 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
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
| Plan | Support Level |
|---|---|
| Free | Community forums, documentation |
| Starter | Email support (48-hour response) |
| Pro | Priority 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
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
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
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.