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Free public beta until December 4, 2026: every course is open, no card needed. After that, the first chapter of each course stays free and full access is a one-time $39 ($19 for up to 100 founding members chosen for helpful feedback). Your progress is kept. How the beta works

JWT

A signed token a client sends with each request to prove who it is.

A JSON Web Token is a signed set of claims; APIs accept it as an Authorization: Bearer header and validate its signature, issuer, audience and expiry.

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Examples

  • Authorization: Bearer eyJhbGciOi... sends a JWT with a request.

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