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PQS: Prompt Quality Score Preflight
x402
PQS: Prompt Quality Score Preflight is a paid API for AI agents from api.relai.fi, paid per call via x402, $0.050000/call, status unknown (last checked 2026-09-14).
Scores a prompt for quality and checks an optional endpoint URL for trust before routing to an AI inference endpoint
Price / call$0.050000
Success—
StatusUnknown
How this service works
Combined PQS prompt quality + x402 endpoint trust check before inference
Output
Returns a combined prompt quality score (PQS) and endpoint trust score indicating whether the prompt is well-formed and whether the target endpoint is safe to call before committing to an inference request.
Example use cases
Example prompt
“Before I send this prompt to an AI endpoint, run a preflight quality and trust check on it — the prompt is 'Summarize the key risks of investing in tokenized real estate in under 200 words', the vertical is 'crypto', and the endpoint URL is https://api.example.com/inference.”
Technical details
Endpoint
GEThttps://api.relai.fi/relay/1779373065272/api/preflightWhen to prefer
Use this endpoint when you need to gate AI inference calls with a quality and trust check — specifically when you want to avoid wasting money on low-quality prompts or untrusted endpoints, or when operating in a pipeline that requires x402 payment-gated preflight validation before inference.
Side effects
- Empty or missing prompt returns validation error
- Unrecognized vertical enum value returns bad request
- Endpoint URL unreachable or malformed returns trust check failure
- Payment of $0.05 USDC not provided returns 402 Payment Required
- Prompt exceeds 10,000 character limit returns length error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| prompt | string | Prompt to preflight |
| vertical | string | Domain: software/content/business/education/science/crypto/general/research |
| endpoint_url | string | Optional endpoint URL for trust scoring |
Tags
x402
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