Error codes

Code	Description
400	Bad request (invalid URL, unsupported format, empty file)
401	Missing or invalid API key
413	Request body too large (>55 MB)
429	Rate limit or monthly quota exceeded
500	Internal analysis error
503	Service busy (all analysis slots occupied)
504	Download or analysis timed out

Error format:

{
  "error": "rate_limit_exceeded",
  "message": "Rate limit exceeded (20 req/min). Retry after 45s.",
  "detail": null
}

On 429 errors, check the Retry-After header — it tells you how many seconds to wait before retrying.