POST /api/v1/instant-post is the paid pack (~2 credits). Same spine as MCP instant_post submit. No extra submit fields.
YouTube / LinkedIn / Instagram / TikTok are not a fifth mode. They are mode=from_url (platform video). A website is from_url (webpage).
From a URL
job_id. Studio: https://app.screencrafter.io/result/{job_id}
From an idea
instruction is optional tone (“don’t make it an ad”). Do not put the idea in instruction.
Poll
Cursor has no WebSocket.status is completed, clips and stills are on the job. Poll is free.
Zip (on demand)
Do not expect zip bytes on complete.zip_url. Same as MCP action: zip.