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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, $0.05/call, status unknown (last checked 2026-09-15).
Evaluates a prompt's quality and optionally scores endpoint trustworthiness before sending it to an AI service
Price / call$0.05
Success—
StatusUnknown
How this service works
Preflight prompt + endpoint trust (Solana x402)
Output
Returns a prompt quality score indicating how well-formed and effective the prompt is expected to be, optionally accompanied by a trust score for the specified endpoint URL, scoped to the chosen domain vertical.
Example use cases
Example prompt
“Can you preflight this prompt for me and tell me its quality score? The prompt is: 'Summarize the latest trends in DeFi yield farming in under 200 words.' Use the crypto vertical, and also check the trust score for the endpoint at https://api.example.com/defi-summary.”
Technical details
Endpoint
GEThttps://api.relai.fi/relay/1779373065272/api/preflight/solWhen to prefer
Use this endpoint when you want to assess a prompt's quality before dispatching it to a downstream AI service, especially when combined with endpoint trust verification. Ideal for agent workflows that need a preflight gate to avoid wasting compute or money on poorly-formed prompts. Best when operating in a specific domain vertical (software, crypto, research, etc.) where scoring precision matters.
Side effects
- Empty or missing prompt returns validation error
- Invalid vertical enum value returns 400 bad request
- Malformed endpoint_url may cause trust scoring to fail or be skipped
- Payment not fulfilled (x402) blocks request execution
- Prompt exceeding 10,000 characters rejected
- Network timeout on slow endpoint trust resolution
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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