Getting Access
There are four ways to build with Saturday. One question routes you: where do your athletes live?Individual API (self-serve)
You’re building your own product, tooling, or coaching stack, and athletes live in your database.- Sign up: saturday.fit/api. Enter an email, complete Stripe Checkout, and your key is revealed once on the success page and emailed to you. Programmatic path:
POST /v1/signup(no auth) returns a hosted checkout URL, built for AI agents acquiring access for their humans. - Price: $5.39/month flat. Cancel anytime.
- Trial economics: every athlete you create gets the standard 30-day full-precision trial (15 calls day one, then 5/day) automatically.
- Limits: 2 requests/second and 200 calls/day, counted per account rather than per key. Outgrowing them is when we want to hear from you: support@saturday.fit.
Coach portal (your athletes use the Saturday app)
If you coach real Saturday-app athletes, the coach portal is your lane: roster, alerts, coverage. Yourcp_ API key lets you build scripts against your roster. See the Coach API guide.
Platform partnership
You run a training platform and want Saturday embedded for your entire user base: partner-namespaced athletes, revenue share, bundle and team offers, webhooks at platform scale. That one starts as a conversation: alex@saturdaymorning.fit.A big team wanting both app athletes and custom tooling beyond roster scripts is partner-shaped. Start the conversation rather than stretching a self-serve key.
Discovery for agents
GET https://api.saturday.fit/v1/ (no auth) self-describes the API: the endpoints currently exposed, plan, price, trial shape, and both signup paths. Site context: saturday.fit/llms.txt.