{"mode":"preview","message":"This endpoint is POST-only with payment. The example_response below shows what a successful POST returns.","example_response":{"pqs_version":"2.0","original_prompt":"Explain PQS scoring in one sentence to an AI agent operator.","optimized_prompt":"You are an AI-agent product manager. In one sentence (max 25 words), explain PQS scoring to a technical buyer evaluating x402 APIs.","vertical":"general","results":{"claude":{"model":"claude-sonnet-4-6","output":"PQS scores any LLM prompt on 8 dimensions pre-inference so x402 API buyers can reject low-quality inputs before paying.","scores":{"completeness":9,"relevancy":9,"reasoning_depth":8,"faithfulness":9,"total":35}},"gpt4o":{"model":"gpt-4o","output":"PQS measures prompt quality across 8 dimensions before the prompt reaches the model - a pre-flight gate for AI-agent buyers.","scores":{"completeness":8,"relevancy":9,"reasoning_depth":7,"faithfulness":8,"total":32}}},"winner":"claude","verdict":"Claude's response names the exact buyer action (reject) and ties to x402, giving the technical buyer a concrete decision rule.","powered_by":"PQS - promptqualityscore.com"},"upgrade":"POST /api/score/compare with x402 payment ($1.25 USDC on Base) and body { prompt, vertical } for multi-model side-by-side comparison.","try_free":"POST /api/score/free with body { prompt, vertical } for unauthenticated 5/min real scoring.","powered_by":"PQS - promptqualityscore.com"}