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PQS: Prompt Quality Score – Variant Generator
x402
PQS: Prompt Quality Score – Variant Generator is a paid API for AI agents from api.relai.fi, paid per call via x402, $0.100000/call, status unknown (last checked 2026-09-14).
Generates N ranked, diverse rewrites of a given prompt scored on an 8-dimension PQS rubric, returned best-first.
Price / call$0.100000
Success—
StatusUnknown
How this service works
Generate N ranked prompt variants. Diverse rewrites scored on the 8-dimension PQS rubric, returned best-first.
Output
A ranked list of up to 5 diverse prompt variants, each scored against the 8-dimension PQS rubric, ordered best-first. Each variant is a rewrite of the original prompt optimized for quality across dimensions like clarity, specificity, and intent alignment.
Example use cases
Example prompt
“Can you give me 5 ranked rewrites of this prompt scored on the PQS rubric for the 'software' vertical: 'Write a Python function that parses JSON and handles errors'? Return the best one first.”
Technical details
Endpoint
GEThttps://api.relai.fi/relay/1779373065272/api/variantsWhen to prefer
Use this endpoint when you need to improve prompt quality through diverse, scored rewrites rather than a single suggestion. Ideal when you want ranked alternatives with objective quality metrics across 8 dimensions, especially for domain-specific verticals like software, research, or content.
Side effects
- Empty or missing prompt returns 400 validation error
- Count outside 1-5 range returns validation error
- Invalid vertical enum value returns 400
- Prompt exceeding 10,000 characters returns 400
- Payment not provided or insufficient returns 402
- Service unavailable returns 503
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| count | integer | Number of variants to generate (1-5) |
| prompt | string | Prompt to generate variants for |
| vertical | string |
Tags
x402
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