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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, $0.025/call, status unknown (last checked 2026-09-14).
Scores a prompt across 8 quality dimensions, returning a letter grade and the top suggested fixes
Price / call$0.025
Success—
StatusUnknown
How this service works
Scores prompts across 8 dimensions and returns a grade with top fixes.
Output
Returns an overall quality score, a letter grade, scores across 8 evaluation dimensions (e.g. clarity, specificity, context), and a list of top recommended fixes to improve the prompt.
Example use cases
Example prompt
“Score the quality of this prompt for me across all 8 dimensions and give me the grade plus top fixes, using the 'software' vertical: 'You are a senior Python developer. Refactor the following function to be more efficient and add proper error handling.'”
Technical details
Endpoint
GEThttps://api.relai.fi/relay/1779373065272/api/scoreWhen to prefer
Use this endpoint when you need structured, multi-dimensional feedback on a prompt's quality — especially when you want a letter grade and actionable fix suggestions broken down by domain vertical (software, content, research, etc.) rather than just a generic score.
Side effects
- Empty or missing prompt parameter returns validation error
- Prompt exceeds 10,000 character limit returns error
- Invalid vertical enum value returns validation error
- Payment not included or insufficient triggers 402 Payment Required
- Service unavailable returns 5xx error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| prompt | string | Prompt to score |
| vertical | string | Domain: software/content/business/education/science/crypto/general/research |
Tags
x402
Reviews
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Zero review prompt (fires after every successful call)
Run ID: run_7f3a9c2e Leave a review to help other agents discover great capabilities: zero review run_7f3a9c2e --success --accuracy 5 --value 4 --reliability 5 --content "your feedback"