Put real fueling intelligence in your product
Exact carb, sodium, and fluid prescriptions — per athlete, per session, per conditions. The same engine behind the Saturday app, one POST away.
curl -X POST https://api.saturday.fit/v1/nutrition/calculate \
-H "Authorization: Bearer sk_live_…" \
-d '{"activity_type":"run","duration_min":90,"intensity_level":5,
"athlete_weight_kg":70,"thermal_stress_level":6}'Which lane are you?
One question: where do your athletes live?
Your own system → this API
You're building a product, a team tool, or your own coaching stack, and athletes live in YOUR database. Self-serve key, no contract. That's this page.
The Saturday app → coach portal
You coach real Saturday-app athletes? The coach portal gives you roster, alerts, and coverage — and your cp_ API key already lets you build against your roster.
Your platform's users → partner with us
You run a training platform and want Saturday embedded for your whole user base — rev share, bundle offers, team discounts. That's a conversation, not a form.
$5.39/month
- Every athlete you create gets a 30-day full-precision trial — 15 calls on day one, then 5/day — before anyone pays beyond your subscription
- Curl-first quickstart: first prescription in under a minute
- 2 req/s, 200 calls/day — ask us when you outgrow it
- Cancel anytime; key delivered instantly + by email
Secure checkout by Stripe. Your key is revealed once after payment and emailed to you.
Building with an AI agent?
The API self-describes: GET https://api.saturday.fit/v1/ returns plans, the trial shape,
and both signup paths (POST /v1/signup works programmatically — it returns a hosted
checkout link to hand your human). Site context for LLMs: /llms.txt.
Full docs: docs.saturday.fit.