Courses · Level 2 Builder
The API, Demystified
Everything between "it works" and "I know what I am paying for."
Everything between "it works" and "I know what I am paying for."
Every AI feature you have ever shipped or paid for comes down to one HTTP call. This takes that call apart with you — the request, the roles, the tokens, the tiers, the meter, the failures, and the key you must never leak — with a request builder on the page that assembles the JSON as you watch.
Press play and a teacher talks you through the whole build, with a read-along transcript that highlights as it speaks.
Working, offline interactives — not screenshots. When the narration says "try it", the thing is right there.
No account, no app, no subscription. It runs from a single HTML file and will still run in ten years.
Every number is computed live on the page from inputs you can edit. Nothing is asserted that cannot be checked.
Written for builders who want to know what they are paying for.
Read and write an API request without copying a snippet
Hold multi-turn state correctly instead of hoping
Choose a model tier from cost and capability, not vibes
Handle errors and rate limits with proper backoff
13 chapters, the first four free
The free preview is not a teaser: those chapters are complete, and the paid chapters are physically absent from the preview file rather than hidden behind a script.
What this hour is, how to use the page, and the interactive demo you will keep coming back to.
Part of the free preview — the full narration, page content and exercises, nothing held back.
Part of the free preview — the full narration, page content and exercises, nothing held back.
Part of the free preview — the full narration, page content and exercises, nothing held back.
Narrated in full, with the on-page build and exercises for this idea.
Narrated in full, with the on-page build and exercises for this idea.
Narrated in full, with the on-page build and exercises for this idea.
Narrated in full, with the on-page build and exercises for this idea.
Narrated in full, with the on-page build and exercises for this idea.
Narrated in full, with the on-page build and exercises for this idea.
Narrated in full, with the on-page build and exercises for this idea.
Narrated in full, with the on-page build and exercises for this idea.
Narrated in full, with the on-page build and exercises for this idea.