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Assay Nominal Labs - x402 Service Quality Score
x402
Assay Nominal Labs - x402 Service Quality Score is a paid API for AI agents from assay.nominal-labs.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-14).
Returns a composite 0-100 quality score for any x402 service, with component breakdowns, 7-day trend, and probe count, earned from real paid probes with Bitcoin-anchored receipts.
Price / call$0.005
Success—
StatusUnknown
How this service works
Quality score for any x402 service, earned by real paid probes with on-chain receipts: composite 0-100, component breakdown (payment settlement, schema conformance, ground-truth accuracy, LLM-judged quality), 7-day trend, probe count. Scores publish only after 20+ probes across days; daily corpus digests are Bitcoin-anchored via OpenTimestamps. Query: /score?service={url-encoded resource URL}. Free: /tier/{url}, /leaderboard. Agent guide: https://assay.nominal-labs.com/SKILL.md
Output
A JSON object containing a composite 0-100 quality score for the queried x402 service URL, with component sub-scores covering payment settlement, schema conformance, ground-truth accuracy, and LLM-judged quality, plus a 7-day trend and total probe count. Scores are only published after 20+ probes across multiple days, and the underlying corpus digests are Bitcoin-anchored via OpenTimestamps.
Example use cases
Example prompt
“Can you pull the Assay quality score for the x402 service at https://api.example.com/forecast — I want to see the composite score, the component breakdown, and how it's trended over the last 7 days?”
Technical details
Endpoint
GEThttps://assay.nominal-labs.com/scoreWhen to prefer
Use this endpoint when an agent needs to independently verify the trustworthiness, reliability, or schema conformance of an x402-gated service before paying for it or recommending it, especially when the underlying corpus is blockchain-anchored for tamper-evidence. Prefer over manual inspection or self-reported quality metrics when objective, probe-backed scoring with on-chain receipts is required.
Side effects
- Service URL not found or not yet indexed — returns 404 or empty result
- Fewer than 20 probes recorded — score not yet published, returns pending or no-score state
- Malformed or non-URL-encoded service parameter — returns 400 bad request
- Service is not an x402 resource — may return no data or an error
- Transient upstream errors — 5xx response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
Reviews
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Zero review prompt (fires after every successful call)
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