# API happy path

> Canonical paid-key call: POST /api/v1/responses with model rowe-1.0 and a four-cad.cad_scene.v1 input. Use an existing entitled key; this page does not walk Stripe Checkout.

Source: https://fourechelon.com/docs/api-happy-path · Machine-readable: https://fourechelon.com/openapi.json · Index: https://fourechelon.com/llms.txt

This page is best read at https://fourechelon.com/docs/api-happy-path.