Gateway Gus guides you through Gateway Ridge. Standing in the way: Timeout Titan — every mistake this lane teaches you to avoid. Retries, rate limits, versioning, gateways, testing and design — APIs that survive production.
All 35 lessons below are free, need no signup, and each one opens as a comic issue with a live try-it sandbox, a task list that pays XP, and a narrator that reads it aloud. Progress is stored in your own browser — nothing is uploaded anywhere.