PQS: Prompt Quality Score – Full Analysis (Solana x402)

Choose this endpoint when you need a structured, scored evaluation of a prompt before deploying it in production, fine-tuning workflows, or comparing prompt variants. It is particularly useful for prompt engineers, AI developers, and content creators who want objective quality metrics rather than subjective human review. The vertical parameter makes it more useful than generic readability tools when you need domain-specific scoring (e.g. software vs. education vs. crypto). Prefer this over ad hoc LLM self-evaluation when you need a consistent, repeatable score.

• Empty or missing prompt returns 400 bad request
• Prompt exceeding 10,000 characters rejected with validation error
• Invalid vertical enum value returns schema validation error
• Payment failure or insufficient Solana balance prevents access (x402 payment required)
• Network or relay timeout if Solana payment confirmation is delayed
• 500 server error if scoring model is unavailable