Data Policy
This page covers how partners may and may not use data returned by Saturday’s API. These rules protect athletes, protect Saturday’s intellectual property, and ensure the API ecosystem remains trustworthy.
Data license
Saturday grants partners a limited license to use API response data. This license is communicated programmatically via the X-Saturday-Data-License response header on every API response.
Permitted uses
Partners may use API response data for:
- Displaying prescriptions and safety metadata to end users (athletes)
- Storing response data temporarily to serve your application’s UX
- Caching prescriptions for performance (cache invalidation on profile update)
Prohibited uses
Partners may NOT use API response data for:
- Training machine learning or AI models
- Fine-tuning language models or other generative AI systems
- Building competing nutrition prescription algorithms
- Aggregating response data across athletes for statistical analysis or resale
- Reverse engineering Saturday’s calculation algorithms
- Redistributing response data to third parties
- Creating derivative databases from product catalog data
The training prohibition is explicit and serious. Saturday’s prescriptions are the product of 15 years of coaching expertise, a PhD in Sport Physiology, and months of algorithm development. Using API responses to train a competing model is grounds for immediate termination.
| Header | Value | Meaning |
|---|
X-Saturday-Data-License | display-only | Data may only be displayed to end users |
X-Saturday-Data-Attribution | required or optional | Whether “Powered by Saturday” is required |
X-Saturday-Data-Training | prohibited | ML/AI training on response data is prohibited |
Attribution requirements
Teaser tier (required)
When displaying teaser/free response data, partners must show “Powered by Saturday” attribution:
- Text: “Powered by Saturday” visible near nutrition data
- Link: Attribution must link to
saturday.fit or the subscription subscribe_url
- Logo: Optional but preferred — Saturday provides approved logo assets
The X-Saturday-Data-Attribution: required header signals this programmatically.
Full tier (optional)
Attribution is appreciated but not required when displaying data for subscribed athletes.
Logo and brand assets
Approved attribution assets are available at https://api.saturday.fit/brand/. Partners must not modify the Saturday logo or use Saturday’s brand in misleading contexts.
Safety disclaimer
Partners must include a visible disclaimer in their application stating that nutrition prescriptions are guidance, not medical instructions. Saturday provides sports nutrition recommendations based on physiological models — not medical advice.
Required disclaimer language
Partners must display, at minimum:
Nutrition recommendations are personalized guidance based on physiological models. They are not a substitute for professional medical evaluation. Consult a healthcare provider for medical dietary needs.
Safety data handling
Partners must NOT:
- Strip, hide, or downplay safety metadata from responses
- Remove safety warnings before displaying data to athletes
- Override or modify Saturday’s risk levels
- Present prescriptions without safety context
Athlete data and privacy
Data controller vs. processor
- Partners act as data controllers for their athletes’ personal data
- Saturday acts as a data processor on behalf of the partner
Partners are responsible for obtaining appropriate consent from athletes before sending their data to Saturday’s API.
GDPR compliance
Saturday provides endpoints for GDPR compliance:
| Endpoint | Right | Description |
|---|
POST /v1/athletes/{id}/export | Data portability | Export all athlete data as JSON |
DELETE /v1/athletes/{id} | Right to erasure | Cascading deletion of all data |
Data retention
Saturday retains athlete data only for as long as the partner account is active, plus a 30-day grace period after deletion. After termination:
- Partner must delete all cached Saturday response data within 30 days
- Athletes’ data remains available for GDPR export for 30 days, then is deleted
Product database protection
Saturday’s curated product database (186+ endurance nutrition products) is competitive intellectual property. The following protections apply:
- All product queries require an
athlete_id — no anonymous product browsing
- Per-athlete rate limits on product endpoints
- No bulk export — product listing endpoints are paginated with a maximum page size
- All product access is logged with partner_id, athlete_id, and query
Systematic scraping, automated enumeration, or bulk extraction of the product database is grounds for immediate account suspension.
Intellectual property
API access does not grant any license to Saturday’s intellectual property beyond the right to display response data to end users. Saturday’s nutrition algorithms, product database, AI coaching models, and knowledge base are proprietary.
Terms modifications
Saturday may modify data policy terms with 30 days advance notice for standard changes or 60 days for material changes. Continued API use after the notice period constitutes acceptance.
