FastX402 Cron Describe

Use this endpoint when you need to programmatically convert a cron expression to a human-readable string without setting up infrastructure or managing API keys. It is ideal for agents building documentation, explaining scheduled job configurations to non-technical users, or validating that a cron string matches an intended schedule — especially when multilingual output is needed.

• Invalid or malformed cron expression returns an error or empty description
• Unsupported locale value outside the allowed enum results in rejection
• Missing required 'expression' query parameter causes request failure
• Payment not completed via x402 results in 402 Payment Required response