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PQS: Prompt Quality Score
x402
PQS: Prompt Quality Score is a paid API for AI agents from api.relai.fi, paid per call via x402, $0.001000/call, status unknown (last checked 2026-09-15).
Scores a prompt's quality using a composite of PEEM, RAGAS, and G-Eval frameworks, returning sub-scores and a verdict to filter weak prompts before expensive inference calls.
Price / call$0.001000
Success—
StatusUnknown
How this service works
Quick pre-flight quality score: composite + three framework sub-scores (PEEM, RAGAS, G-Eval) + verdict. Designed to run upstream of any other paid call to filter weak prompts before inference.
Output
Returns a composite quality score, three framework sub-scores (PEEM, RAGAS, G-Eval), and a pass/fail verdict indicating whether the prompt is strong enough to proceed to inference.
Example use cases
Example prompt
“Before sending this to the model, can you run a PQS quality grade on my prompt — 'Explain the architecture of a microservices system with a focus on fault tolerance' — using the software vertical, so we know if it's strong enough to be worth the inference cost?”
Technical details
Endpoint
GEThttps://api.relai.fi/relay/1779373065272/api/pqs-gradeWhen to prefer
Use this endpoint as a cheap pre-flight filter ($0.001) before calling any expensive LLM inference API. Ideal when you want to avoid wasting budget on poorly formed prompts, or when building pipelines where prompt quality must meet a threshold before proceeding. Prefer this over manual prompt review when operating at scale or in automated agentic workflows.
Side effects
- prompt text is empty or exceeds 10,000 characters — returns validation error
- unsupported vertical value — returns enum validation error
- network timeout or upstream service unavailability — returns 5xx error
- payment not fulfilled (x402) — returns 402 Payment Required
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| prompt | string | Prompt text to grade (1-10000 chars) |
| vertical | string | Optional domain: software/content/business/education/science/crypto/general/research |
Tags
x402
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