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Data Policy

This page covers how partners may and may not use data returned by Saturday’s API. The rules exist to protect athletes and Saturday’s intellectual property.

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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.

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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)

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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
Saturday’s prescriptions are the product of 15 years of coaching expertise and a PhD in Sport Physiology. Using API responses to train a competing model is grounds for immediate termination.

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Response headers

The license header is set before authentication runs, so it appears on rate-limit rejections and auth failures too. Match on the header’s presence rather than parsing its text, which may be reworded.

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Attribution requirements

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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
  • Mark: use the “Powered by Saturday” logo where it fits; appropriately sized plain text is a valid fallback
Teaser responses carry X-Saturday-Data-Attribution: required, and repeat the same terms in the response body’s attribution object.

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Full tier (required, lighter)

When displaying full data for subscribed athletes, show a compact “Powered by Saturday” mark wherever Saturday data appears. Placement is yours; presence is not optional.

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Logo and brand assets

Approved attribution assets (the “Powered by Saturday” mark, light and dark, horizontal and stacked, plus paste-ready snippets) live at https://saturday.fit/brand. Partners must not modify the Saturday mark or use Saturday’s brand in misleading contexts. Full placement, sizing, and per-surface rules: Brand & Attribution.

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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, which are not medical advice.

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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.

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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

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Athlete data and privacy

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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.

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GDPR compliance

Saturday provides endpoints for GDPR compliance: Partners are responsible for responding to athlete data subject requests within the timelines required by applicable law.

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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

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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. There is no anonymous product browsing.
  • Per-athlete rate limits apply on product endpoints. Queries past the limit are served with a progressive delay rather than an error, so a legitimate burst still works and a crawl does not.
  • No bulk export. Product listing endpoints are cursor-paginated with a maximum page size of 10.
  • All product access is logged with partner_id, athlete_id, and the query.
Systematic scraping, automated enumeration, or bulk extraction of the product database is grounds for immediate account suspension.

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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.

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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.